CN115791698A - Gas concentration detection apparatus, control method, control device, and storage medium - Google Patents
Gas concentration detection apparatus, control method, control device, and storage medium Download PDFInfo
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Abstract
The invention discloses a gas concentration detection device and a control method, a control device and a storage medium thereof, wherein the method comprises the following steps: controlling a laser emission module to emit a target linear signal; when a gas signal is absorbed, determining an incident reference light intensity signal of the laser emission module according to the concentration data of the gas to be detected; acquiring a transmission intensity signal of a target linear signal transmitted by a laser transmitting module and penetrating through a gas to be detected; and determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal. The method can keep the linearity of the emission signal of the laser emission module, thereby ensuring the linearity of the baseline in the absorption curve, further quickly calculating the concentration of the gas to be detected in real time, and having high accuracy of the detection result and less consumed calculation resources.
Description
Technical Field
The present invention relates to the field of gas detection technologies, and in particular, to a method for controlling a gas concentration detection apparatus, a device for controlling a gas concentration detection apparatus, a computer-readable storage medium, and a gas concentration detection apparatus.
Background
In a traditional Tunable Diode Laser Absorption Spectroscopy (TDLAS), a sawtooth wave is generally used as a transmission waveform for measuring gas concentration by a direct absorption method, then an echo photocurrent is amplified and collected, and a peak value and an area of gas absorption are extracted from an echo signal. Since the absorption signal is superimposed on the slope of the sawtooth wave, a baseline fitting for subtracting the absorption part is usually required to calculate the absorption peak in order to obtain the intensity power curve of the incident light. However, due to the inherent current-light emitting power nonlinear characteristic of the laser diode, even if the drive current uses a sawtooth wave with very good linearity, the laser signal emitted by the laser is nonlinear, so that the slope baseline in the echo signal has very obvious nonlinearity.
In the related art, a quadratic polynomial or a cubic polynomial is generally used to fit the nonlinear baseline. However, the algorithm using the fitting of the nonlinear baseline is usually calculated by using an upper computer, requires a large amount of calculation resources, cannot detect the gas concentration in real time, and is not suitable for an embedded gas detection system.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a control method for a gas concentration detection device, which can keep the linearity of the emission signal of a laser emission module, thereby ensuring the linearity of a baseline in an absorption curve, and further can calculate the concentration of a gas to be detected quickly and in real time, and has high accuracy of a detection result and less consumed calculation resources.
A second object of the present invention is to provide a control device of a gas concentration detection apparatus.
A third object of the invention is to propose a computer-readable storage medium.
A fourth object of the present invention is to provide a gas concentration detection apparatus.
In order to achieve the above object, a first embodiment of the present invention provides a method for controlling a gas concentration detection apparatus, where the gas concentration detection apparatus includes a laser emission module, and the method includes: controlling a laser emission module to emit a target linear signal; when a gas signal is absorbed, determining an incident reference light intensity signal of the laser emission module according to the concentration data of the gas to be detected; acquiring a transmission intensity signal of a target linear signal transmitted by a laser transmitting module and penetrating through a gas to be detected; and determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
According to the control method of the gas concentration detection equipment, firstly, the laser emission module is controlled to emit the target linear signal, when the gas signal is absorbed, the incident reference light intensity signal of the laser emission module is determined according to the data of the concentration of the gas to be detected, then the transmission intensity signal of the target linear signal emitted by the laser emission module and penetrating through the gas to be detected is obtained, and the concentration of the gas to be detected is determined according to the incident reference light intensity signal and the transmission intensity signal. Therefore, the method can keep the linearity of the emission signal of the laser emission module, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
In addition, the control method of the gas concentration detection apparatus according to the above-described embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the gas concentration detection apparatus further includes: singlechip, laser receiving module and infrared mirror, wherein, the infrared mirror is configured to the transmitting signal that reflection laser emission module sent, and laser receiving module is configured to the signal of receiving after infrared mirror reflection, and the singlechip is configured to the signal that receives laser receiving module and receives, acquires the linear signal of target, includes: acquiring an original emission signal of a laser emission module and an acquisition signal of a singlechip; and correcting the original transmitting signal according to the original transmitting signal and the acquired signal to obtain a target linear signal.
According to one embodiment of the invention, the correction of the original transmission signal according to the original transmission signal and the acquisition signal comprises: determining a compensation signal according to a signal difference between an original emission signal and a collected signal; determining a residual error according to the compensation signal; and when the residual error is greater than or equal to a preset threshold value, correcting the original transmitting signal according to the compensation signal.
According to one embodiment of the invention, the modifying of the original transmission signal according to the compensation signal comprises: acquiring an opposite compensation signal of the compensation signal; a target linear signal is determined from the superposition of the original transmit signal and the inverse compensation signal.
According to one embodiment of the invention, the method for determining the incident reference light intensity signal of the laser emission module according to the gas concentration data to be measured comprises the following steps: acquiring to-be-detected gas concentration data of a part without gas absorption to be detected in to-be-detected gas concentration data; and carrying out linear fitting on the concentration data of the gas to be measured without the gas absorption part to be measured once to determine an incident reference light intensity signal.
According to one embodiment of the invention, the transmission intensity signal and the concentration of the gas to be measured are determined by the following formula:
wherein ,
a signal representing the intensity of the transmitted light,
representing the incident reference light intensity signal and,
which represents the absorption coefficient of the gas to be measured,
which is indicative of the concentration of the gas to be measured,
representing the path of the target linear signal through the gas to be measured,
which is indicative of the pressure of the gas,
the line strength of the absorption line of the gas to be measured,
represents a linear function, satisfies
。
According to an embodiment of the present invention, after acquiring the acquisition signal of the single chip microcomputer, the method further includes: and filtering the acquired signal of the singlechip by adopting Kalman filtering.
In order to achieve the above object, a second aspect of the present invention provides a control apparatus for a gas concentration detection device, the gas concentration detection device including a laser emission module, the apparatus including: the control module is used for controlling the laser emission module to emit a target linear signal; the first determining module is used for determining an incident reference light intensity signal of the laser emitting module according to the concentration data of the gas to be detected when the gas signal is absorbed; the second determining module is used for acquiring a transmission intensity signal of a target linear signal transmitted by the laser transmitting module and penetrating through the gas to be detected; and the control module is used for determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
According to the control device of the gas concentration detection equipment, the control module controls the laser emission module to emit the target linear signal; when a gas signal is absorbed, the first determining module determines an incident reference light intensity signal of the laser emitting module according to the concentration data of the gas to be detected; the second determining module acquires a transmission intensity signal of a target linear signal transmitted by the laser transmitting module and penetrating through the gas to be detected; and the control module determines the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal. Therefore, the device can keep the linearity of the emission signal of the laser emission module, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
To achieve the above object, a third aspect of the present invention provides a computer-readable storage medium having stored thereon a control program of a gas concentration detection apparatus, which when executed by a processor, implements the above-described control method of the gas concentration detection apparatus.
According to the computer-readable storage medium of the embodiment of the invention, by executing the control method of the gas concentration detection device, the emitted signal of the laser emission module can be kept linear, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be calculated rapidly and in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
In order to achieve the above object, a fourth aspect of the present invention provides a gas concentration detection apparatus, including: the laser emission module is used for emitting a target linear signal; the infrared reflecting mirror is used for reflecting the transmitting signal sent by the laser transmitting module; the laser receiving module is used for receiving the signal reflected by the infrared reflector; and the singlechip is used for controlling the laser emission module to emit a target linear signal, determining an incident reference light intensity signal of the laser emission module according to the data of the concentration of the gas to be detected when the gas signal is absorbed, acquiring a transmission intensity signal of the target linear signal emitted by the laser emission module and penetrating through the gas to be detected, and determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
According to the gas concentration detection device provided by the embodiment of the invention, the laser emission module emits a target linear signal, the infrared reflector reflects an emission signal sent by the laser emission module, the laser receiving module receives a signal reflected by the infrared reflector, the singlechip controls the laser emission module to emit the target linear signal, and when a gas signal is absorbed, an incident reference light intensity signal of the laser emission module is determined according to the gas concentration data to be detected, a transmission intensity signal of the target linear signal emitted by the laser emission module and penetrating through the gas to be detected is obtained, and the concentration of the gas to be detected is determined according to the incident reference light intensity signal and the transmission intensity signal. Therefore, the device can keep the linearity of the emission signal of the laser emission module, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a control method of a gas concentration detection apparatus according to an embodiment of the present invention;
FIG. 2 is a block schematic diagram of a gas concentration detection apparatus according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of concentration data of a gas to be measured according to one embodiment of the invention;
FIG. 4 is a block schematic diagram of a gas concentration detection apparatus according to one embodiment of the present invention;
fig. 5a is a schematic waveform diagram of a single chip microcomputer according to an embodiment of the present invention when the collected signal is not adjusted;
FIG. 5b is a schematic diagram of a waveform of an adjusted transmit signal to a single-chip according to one embodiment of the invention;
fig. 5c is a schematic waveform diagram of an adjusted acquisition signal of the single chip according to an embodiment of the present invention;
fig. 6 is a block diagram schematically illustrating a control device of the gas concentration detection apparatus according to the embodiment of the present invention;
fig. 7 is a block schematic diagram of a gas concentration detection apparatus according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of a gas concentration detection apparatus, a computer-readable storage medium, and a gas concentration detection apparatus proposed by embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of a gas concentration detection apparatus according to an embodiment of the present invention.
In one embodiment of the present invention, as shown in fig. 2, the gas concentration detection apparatus 200 includes a laser emitting module 210, and when the concentration of the gas to be detected is detected, the laser emitting module 210 emits a laser signal through the gas to be detected, and the laser signal is absorbed by the gas to be detected, so that the concentration of the gas to be detected can be detected. In some embodiments, the Laser emission module 210 includes a DFB (distributed feedback Laser) and a DAC chip. The TEC refrigeration piece and the thermistor are packaged in the DFB, the center wavelength of the laser is near 1653.72 nm, the position of the center wavelength of the laser can be changed by changing temperature and current, the output line width of the laser is about 10 MHZ, and the power of the laser is 10 mW at most. A DAC (Digital Analog Converter) chip may send a sawtooth wave linear modulation signal, i.e. a driving current, to drive a laser to emit a laser signal.
As shown in fig. 1, the control method of the gas concentration detection apparatus according to the embodiment of the present invention may include the steps of:
s1, controlling a laser emission module to emit a target linear signal.
Specifically, due to the inherent current-light emitting power nonlinearity of the laser emitting module, even if the driving current uses a sawtooth wave with very good linearity, the signal emitted by the laser emitting module still exhibits nonlinearity. When the concentration of the gas to be detected is calculated, if the signal emitted by the laser emission module is linear, the calculation steps can be simple and convenient, and the calculation resources are saved. The process of controlling the laser emitting module to emit the target linear signal will be described in detail below.
And S2, when a gas signal is absorbed, determining an incident reference light intensity signal of the laser emission module according to the gas concentration data to be detected.
According to one embodiment of the invention, the method for determining the incident reference light intensity signal of the laser emission module according to the gas concentration data to be measured comprises the following steps: acquiring to-be-detected gas concentration data without a to-be-detected gas absorption part in to-be-detected gas concentration data; and carrying out linear fitting on the concentration data of the gas to be measured without the gas absorption part to be measured once to determine an incident reference light intensity signal.
Specifically, after the laser emission module is controlled to emit the target linear signal in step S1, the concentration of the gas to be detected can be detected. The gas concentration measurement by laser is realized based on beer-lambert law, and when a laser emitting module emits a laser beam with a determined wavelength (namely a target linear signal) to pass through the gas to be measured, a part of the laser beam can generate energy attenuation due to the absorption of gas molecules. When there is gas signal absorption, the concentration data of the gas to be measured is obtained as shown in fig. 3, where the abscissa is the number of collected points of the collected absorption waveform data, and the ordinate is the photovoltage. As can be seen from fig. 3, when there is gas absorption, the to-be-detected gas concentration data of the to-be-detected gas absorption portion may have an obvious absorption peak, the to-be-detected gas concentration data of the to-be-detected gas absorption portion is located on both sides of the absorption peak, and a fitting baseline can be obtained by performing linear fitting on the to-be-detected gas concentration data of the to-be-detected gas absorption portion, where the fitting baseline is the incident reference light intensity signal.
And S3, acquiring a transmission intensity signal of the target linear signal transmitted by the laser transmitting module and penetrating through the gas to be detected.
Specifically, as shown in fig. 3, the transmission intensity signal of the target linear signal through the gas to be detected is the gas concentration data of the gas absorption portion to be detected, and can be directly acquired by the gas concentration detection device.
And S4, determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
According to one embodiment of the invention, the concentration of the gas to be measured is determined by the following formula:
wherein ,
a signal representing the intensity of the transmitted light,
representing the incident reference light intensity signal and,
which represents the absorption coefficient of the gas to be measured,
which is indicative of the concentration of the gas to be measured,
representing the path of the target linear signal through the gas to be measured,
which is indicative of the pressure of the gas,
the line strength of the absorption spectrum line of the gas to be measured is shown,
represents a linear function, satisfies
。
Specifically, when the target linear signal emitted by the laser emission module passes through the gas to be measured, the intensity signal is transmitted
And the concentration of the gas to be measured
Satisfies the above formula (1). In the formula (1), however, theAbsorption coefficient of gas to be measured
With gas pressure
The line intensity of the absorption spectrum line of the gas to be measured
In this regard, equation (1) can be converted to equation (2). In formula (2), the path of the target linear signal through the gas to be measured
Pressure of gas
The line intensity of the absorption spectrum line of the gas to be measured
For a known quantity, the transmitted intensity signal is
Incident reference light intensity signal
Substituting into formula (2) to obtain the concentration of the gas to be measured
。
Therefore, the control method of the gas concentration detection equipment provided by the embodiment of the invention can keep the linearity of the emission signal of the laser emission module, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
The following describes in detail a specific process of controlling the laser emitting module to emit the target linear signal in step S1 in conjunction with a specific embodiment.
In one embodiment of the present invention, as shown in fig. 4, the gas concentration detection apparatus 200 further includes: the laser module comprises a single chip microcomputer 240, a laser receiving module 230 and an infrared reflecting mirror 220, wherein the infrared reflecting mirror 220 is configured to reflect a transmitting signal sent by the laser transmitting module 210, the laser receiving module 230 is configured to receive a signal reflected by the infrared reflecting mirror, and the single chip microcomputer 240 is configured to receive a signal received by the laser receiving module 230.
Specifically, as shown in fig. 4, the laser emitting module 210 may be driven by a low-frequency sawtooth current modulation signal with a frequency of 100Hz to send an emitting signal, the emitting signal is reflected by two infrared reflectors 220 vertically arranged and then sent to the laser receiving module 230, the laser receiving module 230 converts the received emitting signal and sends the converted emitting signal to the single chip microcomputer 240, and the signal received by the single chip microcomputer 240 and sent by the laser receiving module is an acquired signal. In some embodiments, the laser emitting module 210 includes a photo detector and an ADC (analog to Digital Converter) chip, wherein the photo detector converts the emission signal into a current signal after receiving the emission signal, and the ADC chip converts the current signal into a Digital signal and sends the Digital signal to the single chip 240.
According to one embodiment of the present invention, acquiring a target linear signal includes: acquiring an original emission signal of a laser emission module and an acquisition signal of a singlechip; and correcting the original transmitting signal according to the original transmitting signal and the acquired signal to obtain a target linear signal.
Specifically, the original emission signal of the laser emission module may be a low-frequency sawtooth wave signal with a frequency of 100Hz and a period of 10 ms. The sampling frequency of the acquisition signal of the singlechip can be 100 kHz, so that the waveform data acquired in each sawtooth wave emission period reaches 1000 points. In order to remove noise in the acquired signal, according to an embodiment of the present invention, after the acquired signal of the single chip microcomputer is acquired, kalman filtering is used to perform filtering processing on the acquired signal of the single chip microcomputer.
Because the signal emitted by the laser emission module will present nonlinearity, the acquired signal of the single chip microcomputer will also present nonlinearity, and the waveform of the acquired signal is as shown in fig. 5a, therefore, before gas concentration detection, the original emission signal needs to be corrected according to the original emission signal and the acquired signal, so that the waveform emitted by the laser emission module is linear.
According to an embodiment of the present invention, the modifying the original transmission signal according to the original transmission signal and the collected signal includes: determining a compensation signal according to a signal difference between an original emission signal and a collected signal; determining a residual error according to the compensation signal; and when the residual error is greater than or equal to a preset threshold value, correcting the original transmitting signal according to the compensation signal.
Further, according to an embodiment of the present invention, the modifying the original transmission signal according to the compensation signal includes: acquiring an opposite compensation signal of the compensation signal; a target linear signal is determined from the superposition of the original transmit signal and the inverse compensation signal.
Specifically, after the single chip microcomputer obtains an original emission signal of the laser emission module and a collection signal of the single chip microcomputer, the original emission signal and the collection signal can be subjected to subtraction, and an obtained signal difference value is a compensation signal. And then solving a residual error of the compensation signal, and comparing the residual error with a preset threshold value. And when the residual error is smaller than the preset threshold value, the original transmitting signal is not corrected. And when the residual error is greater than or equal to the preset threshold value, inverting the compensation signal to obtain an opposite compensation signal, and superposing the opposite compensation signal and the original transmission signal, wherein the waveform of the transmission signal after superposition is shown in fig. 5 b. The singlechip controls the laser emission module to emit laser signals according to the emission signals after superposition, so that the emission signals are linear, namely target linear signals. After the laser emission module emits the target linear signal, the waveform of the acquired signal of the single chip is linear, as shown in fig. 5 c. Therefore, the singlechip can adjust the emission waveform of the laser emission module in real time according to the acquired signal, so that the nonlinearity of the emission waveform of the laser emission module caused by current tuning can be eliminated.
Further, after the laser emitting module emits the target linear signal, the concentration of the gas to be detected may be detected through the foregoing steps S2 to S4.
In summary, according to the control method of the gas concentration detection apparatus in the embodiment of the present invention, the laser emission module is first controlled to emit the target linear signal, and when a gas signal is absorbed, the incident reference light intensity signal of the laser emission module is determined according to the data of the gas concentration to be detected, then the transmission intensity signal of the target linear signal emitted by the laser emission module, which passes through the gas to be detected, is obtained, and the gas concentration to be detected is determined according to the incident reference light intensity signal and the transmission intensity signal. Therefore, the method can keep the linearity of the emission signal of the laser emission module, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
The invention further provides a control device of the gas concentration detection equipment, which corresponds to the embodiment.
Fig. 6 is a block diagram schematically illustrating a control device of the gas concentration detection apparatus according to the embodiment of the present invention.
As shown in fig. 6, the control apparatus 100 of the gas concentration detection device of the embodiment of the present invention, the gas concentration detection device 200 includes a laser emitting module 210, and the control apparatus 100 of the gas concentration detection device may include: a control module 110, a first determination module 120, and a second determination module 130.
The control module 110 is configured to control the laser emitting module 210 to emit the target linear signal. The first determining module 120 is configured to determine an incident reference light intensity signal of the laser emitting module 210 according to the data of the concentration of the gas to be detected when the gas signal is absorbed. The second determining module 130 is configured to obtain a transmission intensity signal of the target linear signal emitted by the laser emitting module 210 through the gas to be measured. The control module 110 is further configured to determine the concentration of the gas to be measured according to the incident reference light intensity signal and the transmission intensity signal.
According to an embodiment of the present invention, the gas concentration detection apparatus 200 further includes: the laser system comprises a single chip microcomputer 240, a laser receiving module 230 and an infrared reflecting mirror 220, wherein the infrared reflecting mirror 220 is configured to reflect a transmitting signal sent by a laser transmitting module 210, the laser receiving module 230 is configured to receive a signal reflected by the infrared reflecting mirror 220, the single chip microcomputer 240 is configured to receive a signal received by the laser receiving module 230, and a control module 110 obtains a target linear signal, which is specifically used for obtaining an original transmitting signal of the laser transmitting module 210 and a collecting signal of the single chip microcomputer 240; and correcting the original transmitting signal according to the original transmitting signal and the acquired signal to obtain a target linear signal.
According to an embodiment of the present invention, the control module 110 modifies the original transmitting signal according to the original transmitting signal and the collected signal, and is specifically configured to determine a compensation signal according to a signal difference between the original transmitting signal and the collected signal; determining a residual error from the compensation signal; and when the residual error is greater than or equal to a preset threshold value, correcting the original transmitting signal according to the compensation signal.
According to an embodiment of the present invention, the control module 110 modifies the original transmitting signal according to the compensation signal, specifically, to obtain an inverse compensation signal of the compensation signal; a target linear signal is determined from the superposition of the original transmit signal and the inverse compensation signal.
According to an embodiment of the present invention, the first determining module 120 determines the incident reference light intensity signal of the laser emitting module 210 according to the gas concentration data to be measured, specifically, is used to obtain the gas concentration data without the absorption portion of the gas to be measured in the gas concentration data to be measured; and performing linear fitting on the concentration data of the gas to be measured without the absorption part of the gas to be measured to determine an incident reference light intensity signal.
According to one embodiment of the invention, the control module 110 determines the concentration of the gas to be measured by the following equation:
wherein ,
a signal representing the intensity of the transmitted light,
representing the incident reference light intensity signal,
which represents the absorption coefficient of the gas to be measured,
which is indicative of the concentration of the gas to be measured,
representing the path of the target linear signal through the gas to be measured,
which is indicative of the pressure of the gas,
the line strength of the absorption line of the gas to be measured,
represents a linear function, satisfies
。
According to an embodiment of the present invention, after acquiring the acquisition signal of the single chip microcomputer 240, the control module 110 is further configured to perform filtering processing on the acquisition signal of the single chip microcomputer 240 by using kalman filtering.
It should be noted that, please refer to the details disclosed in the control method of the gas concentration detection apparatus in the embodiment of the present invention, which are not disclosed in the control apparatus of the gas concentration detection apparatus in the embodiment of the present invention, and details are not repeated herein.
According to the control device of the gas concentration detection equipment, the control module controls the laser emission module to emit a target linear signal; when a gas signal is absorbed, the first determining module determines an incident reference light intensity signal of the laser emitting module according to the concentration data of the gas to be detected; the second determining module acquires a transmission intensity signal of a target linear signal transmitted by the laser transmitting module and penetrating through the gas to be detected; and the control module determines the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal. Therefore, the device can keep the linearity of the emission signal of the laser emission module, so that the linearity of the base line in the absorption curve is guaranteed, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
Corresponding to the above embodiment, the present invention further provides a computer readable storage medium.
A computer-readable storage medium of an embodiment of the present invention has stored thereon a control program of a gas concentration detection apparatus, which when executed by a processor, implements the above-described control method of the gas concentration detection apparatus.
According to the computer-readable storage medium of the embodiment of the invention, by executing the control method of the gas concentration detection device, the emitted signal of the laser emission module can be kept linear, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be calculated rapidly and in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
The invention further provides gas concentration detection equipment corresponding to the embodiment.
Fig. 7 is a block schematic diagram of a gas concentration detection apparatus according to an embodiment of the present invention.
As shown in fig. 7, the gas concentration detection apparatus 200 according to the embodiment of the present invention may include: the laser emitting module 210, the infrared reflecting mirror 220, the laser receiving module 230 and the single chip microcomputer 240.
The laser emitting module 210 is used for emitting a target linear signal. The infrared reflecting mirror 220 is used to reflect the emission signal sent from the laser emission module 210. And a laser receiving module 230 for receiving the signal reflected by the infrared reflecting mirror 220. The single chip 240 is configured to control the laser emitting module 210 to emit a target linear signal, and when a gas signal is absorbed, determine an incident reference light intensity signal of the laser emitting module 210 according to the data of the gas concentration to be detected, obtain a transmission intensity signal of the target linear signal emitted by the laser emitting module 210 passing through the gas to be detected, and determine the gas concentration to be detected according to the incident reference light intensity signal and the transmission intensity signal.
According to an embodiment of the present invention, the single chip 240 obtains a target linear signal, specifically, obtains an original emission signal of the laser emission module 210 and an acquisition signal of the single chip 240; and correcting the original transmitting signal according to the original transmitting signal and the acquired signal to obtain a target linear signal.
According to an embodiment of the present invention, the single chip microcomputer 240 corrects the original transmitting signal according to the original transmitting signal and the collected signal, and is specifically configured to determine a compensation signal according to a signal difference between the original transmitting signal and the collected signal; determining a residual error from the compensation signal; and when the residual error is greater than or equal to a preset threshold value, correcting the original transmitting signal according to the compensation signal.
According to an embodiment of the present invention, the single chip microcomputer 240 corrects the original transmitting signal according to the compensation signal, specifically, for obtaining an opposite compensation signal of the compensation signal; and determining a target linear signal according to the superposition of the original transmitting signal and the opposite compensation signal.
According to an embodiment of the present invention, the single chip microcomputer 240 determines an incident reference light intensity signal of the laser emission module 210 according to the gas concentration data to be measured, and is specifically configured to obtain the gas concentration data to be measured without a gas absorption portion to be measured in the gas concentration data to be measured; and carrying out linear fitting on the concentration data of the gas to be measured without the gas absorption part to be measured once to determine an incident reference light intensity signal.
According to an embodiment of the present invention, the single chip 240 determines the concentration of the gas to be measured by the following formula:
wherein ,
indicating transmissionThe intensity signal is a signal of the intensity,
representing the incident reference light intensity signal,
which represents the absorption coefficient of the gas to be measured,
which is indicative of the concentration of the gas to be measured,
representing the path of the target linear signal through the gas to be measured,
which is indicative of the pressure of the gas,
the line strength of the absorption line of the gas to be measured,
represents a linear function, satisfies
。
After acquiring the acquisition signal, the single chip microcomputer 240 is further configured to perform filtering processing on the acquisition signal by using kalman filtering according to an embodiment of the present invention.
It should be noted that details that are not disclosed in the gas concentration detection apparatus according to the embodiment of the present invention are referred to details that are disclosed in the control method of the gas concentration detection apparatus according to the embodiment of the present invention, and are not repeated here.
According to the gas concentration detection device provided by the embodiment of the invention, the laser emission module emits a target linear signal, the infrared reflector reflects an emission signal sent by the laser emission module, the laser receiving module receives a signal reflected by the infrared reflector, the singlechip controls the laser emission module to emit the target linear signal, and when a gas signal is absorbed, an incident reference light intensity signal of the laser emission module is determined according to the gas concentration data to be detected, a transmission intensity signal of the target linear signal emitted by the laser emission module and penetrating through the gas to be detected is obtained, and the concentration of the gas to be detected is determined according to the incident reference light intensity signal and the transmission intensity signal. Therefore, the device can keep the linearity of the emission signal of the laser emission module, so that the linearity of the baseline in the absorption curve is ensured, the concentration of the gas to be detected can be rapidly calculated in real time, the accuracy of the detection result is high, and the consumed calculation resources are few.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of a gas concentration detection apparatus, characterized in that the gas concentration detection apparatus includes a laser emission module, the method comprising:
controlling the laser emission module to emit a target linear signal;
when a gas signal is absorbed, determining an incident reference light intensity signal of the laser emission module according to the concentration data of the gas to be detected;
acquiring a transmission intensity signal of the target linear signal transmitted by the laser transmitting module and penetrating through the gas to be detected;
and determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
2. The control method of a gas concentration detection apparatus according to claim 1, characterized in that the gas concentration detection apparatus further comprises: the single chip microcomputer, the laser receiving module and the infrared reflecting mirror, wherein the infrared reflecting mirror is configured to reflect the emission signal sent by the laser emitting module, the laser receiving module is configured to receive the signal reflected by the infrared reflecting mirror, the single chip microcomputer is configured to receive the signal received by the laser receiving module, and a target linear signal is obtained, and the method comprises the following steps:
acquiring an original emission signal of the laser emission module and an acquisition signal of the singlechip;
and correcting the original transmitting signal according to the original transmitting signal and the acquired signal so as to obtain a target linear signal.
3. The method for controlling a gas concentration detection apparatus according to claim 2, wherein the correcting the original emission signal based on the original emission signal and the collected signal includes:
determining a compensation signal according to a signal difference between the original emission signal and the acquired signal;
determining a residual error from the compensation signal;
and when the residual error is greater than or equal to a preset threshold value, correcting the original transmitting signal according to the compensation signal.
4. The control method of the gas concentration detection apparatus according to claim 3, wherein the correcting the original emission signal based on the compensation signal includes:
acquiring an opposite compensation signal of the compensation signal;
and determining the target linear signal according to the superposition of the original transmitting signal and the opposite compensation signal.
5. The method for controlling the gas concentration detection device according to claim 1, wherein determining the incident reference light intensity signal of the laser emission module according to the gas concentration data to be detected comprises:
acquiring to-be-detected gas concentration data without a to-be-detected gas absorption part in to-be-detected gas concentration data;
and carrying out linear fitting on the concentration data of the gas to be measured of the gas absorption part without the gas to be measured to determine the incident reference light intensity signal.
6. The control method of a gas concentration detection apparatus according to claim 1, characterized in that the gas concentration to be measured is determined by the following formula:
wherein ,
a signal representative of the transmitted intensity of light,
representing the incident reference light intensity signal,
which represents the absorption coefficient of the gas to be measured,
which is indicative of the concentration of the gas to be measured,
representing the path of the target linear signal through the gas to be measured,
which is indicative of the pressure of the gas,
the line strength of the absorption line of the gas to be measured,
represents a linear function of
。
7. The control method of a gas concentration detection apparatus according to claim 2, characterized in that after acquiring the acquisition signal of the one-chip microcomputer, the method further comprises:
and filtering the acquired signal of the singlechip by adopting Kalman filtering.
8. A control apparatus of a gas concentration detection device, characterized in that the gas concentration detection device includes a laser emission module, the apparatus comprising:
the control module is used for controlling the laser emission module to emit a target linear signal;
the first determining module is used for determining an incident reference light intensity signal of the laser emitting module according to the concentration data of the gas to be detected when the gas signal is absorbed;
the second determination module is used for acquiring a transmission intensity signal of the target linear signal transmitted by the laser transmitting module and penetrating through the gas to be detected;
and the control module is used for determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
9. A computer-readable storage medium, characterized in that a control program of a gas concentration detection apparatus that realizes the control method of the gas concentration detection apparatus according to any one of claims 1 to 7 when executed by a processor is stored thereon.
10. A gas concentration detection apparatus characterized by comprising:
the laser emission module is used for emitting a target linear signal;
the infrared reflecting mirror is used for reflecting the transmitting signal sent by the laser transmitting module;
the laser receiving module is used for receiving the signal reflected by the infrared reflector;
the single chip microcomputer is used for controlling the laser emission module to emit a target linear signal, determining an incident reference light intensity signal of the laser emission module according to the data of the concentration of the gas to be detected when the gas signal is absorbed, determining a transmission intensity signal of the laser emission module penetrating through the gas to be detected according to the incident reference light intensity signal and the gas parameter, and determining the concentration of the gas to be detected according to the incident reference light intensity signal and the transmission intensity signal.
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