CN102507507B - Device and method for detecting concentration of gas to be detected through temperature correction - Google Patents
Device and method for detecting concentration of gas to be detected through temperature correction Download PDFInfo
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- CN102507507B CN102507507B CN 201110353639 CN201110353639A CN102507507B CN 102507507 B CN102507507 B CN 102507507B CN 201110353639 CN201110353639 CN 201110353639 CN 201110353639 A CN201110353639 A CN 201110353639A CN 102507507 B CN102507507 B CN 102507507B
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Abstract
The invention discloses a device and a method for detecting concentration of gas to be detected through temperature correction. The method comprises the following steps of: reflecting infrared rays with the wavelength of 2-12mu m emitted by a heated radiation source, and performing frequency modulation on the infrared beams; detecting energy change of the infrared beams after the infrared beams subjected to frequency modulation passes through a gas to be detected in an analytic gas chamber by using a microflowmeter, and converting the energy change into an alternating current voltage signal; and correcting the alternating current voltage signal according to the influence of the change of ambient temperature on a measurement result, processing the corrected alternating current voltage signal to obtain a concentration signal corresponding to the change of the concentration of the gas to be detected, and displaying or controlling the concentration signal.
Description
Technical field
The present invention relates to the environmental monitoring field, in particular to a kind of apparatus and method of utilizing the temperature correction to detect tested gas concentration.
Background technology
Along with the maximization of commercial plants such as China's petrochemical industry, metallurgy, electric power and the lifting of overall technology equipment, along with to save energy and reduce the cost, improve the quality, pollution treatment reduces discharging and the pursuit day by day of safety in production, importance and the use amount of online analytical instrument grow with each passing day.Infrared spectrum is one of online analytical instrument analytical technology with the fastest developing speed in recent years, plurality of advantages such as has fast, efficient, harmless.
But infrared ray gas analyzer requires very high to environment temperature, variation of ambient temperature directly influences stability of light source, influences the intensity of infrared radiation, influences the gas sample density of measuring air chamber continuous flow, operate as normal with detecting device, especially based on the infrared spectrometry method of micrometeor detecting device, because adopting the sensitive characteristic of sensitive element to measure small gas flow changes, therefore, be more prone to be subjected to the interference of environment temperature, thus the measuring accuracy of having influence on.
Summary of the invention
The invention provides a kind of apparatus and method of utilizing the temperature correction to detect tested gas concentration, in order to reduce environment temperature to the influence of gas detectable concentration.
For achieving the above object, the invention provides a kind of device that utilizes the temperature correction to detect tested gas concentration, it comprises:
Infrared origin gives off the infrared ray that wavelength is 2～12 μ m when it is heated;
Minute surface is arranged in the housing of infrared origin, is infrared beam with infrared reflection;
Cut optical module, infrared beam is become interrupted light, so that it is carried out frequency modulation (PFM);
Measuring cell is made up of the analysis air chamber that is arranged on the light path of warbled infrared beam;
The micrometeor detecting device detects the infrared beam ultrared energy variation behind the tested gas in the air chamber by analysis after frequency modulation (PFM), and converts thereof into ac voltage signal;
The concentration correction module is revised ac voltage signal the influence of measurement result according to the variation of environment temperature, and revised ac voltage signal handled obtains changing corresponding concentration signal for showing or control with tested gas concentration.
Preferable, the concentration correction module comprises:
The match unit, for detection of under a plurality of ambient temperature value through the corresponding a plurality of magnitudes of voltage behind zero crossing gas of the infrared beam after the frequency modulation (PFM), according to least square method a plurality of magnitudes of voltage and corresponding a plurality of ambient temperature value are carried out match, obtain formula:
y＝Ax
2+Bx+C
Wherein x is environment temperature, and y is the magnitude of voltage of ac voltage signal, and A, B, C are fitting coefficient;
Amending unit is used for according to following formula ac voltage signal being revised:
Wherein, a1 is the magnitude of voltage of ac voltage signal, and a2 is by formula y=Ax under the corresponding environment temperature of detectable voltage signals
2The magnitude of voltage that+Bx+C calculates, b1 are through the revised desired voltage values of excess temperature, and b2 is by formula y=Ax under the normal a certain temperature of measuring in the temperature range
2The magnitude of voltage that+Bx+C calculates;
Circuit control unit is used for revised ac voltage signal is amplified rectification and linearization, obtains changing corresponding concentration signal for showing or control with tested gas concentration.
For achieving the above object, the present invention also provides a kind of method of utilizing the temperature correction to detect tested gas concentration, and this method may further comprise the steps:
The wavelength that heated radiation source is sent is that the infrared reflection of 2～12 μ m is infrared beam, and infrared beam is carried out frequency modulation (PFM);
Detect infrared beam ultrared energy variation behind the tested gas in the air chamber by analysis after frequency modulation (PFM) by the micrometeor detecting device, and convert thereof into ac voltage signal;
Variation according to environment temperature is revised ac voltage signal the influence of measurement result, and revised ac voltage signal handled obtains changing corresponding concentration signal for showing or control with tested gas concentration.
Preferable, in the above-described embodiments, according to the variation of environment temperature the influence of measurement result is revised step to ac voltage signal and comprises:
Detect under a plurality of ambient temperature value through the corresponding a plurality of magnitudes of voltage behind zero crossing gas of the infrared beam after the frequency modulation (PFM);
According to least square method a plurality of magnitudes of voltage and corresponding a plurality of ambient temperature value are carried out match, obtain formula:
y＝Ax
2+Bx+C
Wherein x is environment temperature, and y is the magnitude of voltage of ac voltage signal, and A, B, C are fitting coefficient;
According to following formula ac voltage signal is revised:
Wherein, a1 is the magnitude of voltage of ac voltage signal, and a2 is by formula y=Ax under the corresponding environment temperature of detectable voltage signals
2The magnitude of voltage that+Bx+C calculates, b1 are through the revised desired voltage values of excess temperature, and b2 is by formula y=Ax under the normal a certain temperature of measuring in the temperature range
2The magnitude of voltage that+Bx+C calculates.
Preferable, in the above-described embodiments, revised ac voltage signal handled obtaining changing corresponding concentration signal for showing or the control step comprises with tested gas concentration:
Revised ac voltage signal is amplified rectification and linearization, obtain changing corresponding concentration signal for showing or control with tested gas concentration.
In the above-described embodiments, testing result carried out temperature compensation after, the magnitude of voltage of compensation back zero point and terminal point is influenced by ambient temperature less, thereby makes that the concentration of the tested gas that finally records is comparatively accurate, reaches effect temperature compensation.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is magnitude of voltage and temperature relation synoptic diagram according to an embodiment of the invention;
Fig. 2 detects the method flow diagram of tested gas concentration for the temperature correction that utilizes of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not paying the every other embodiment that obtains under the creative work prerequisite.
The infrared gas analyzer that is used for the tested gas concentration variation of measurement is made up of infrared analysis part, circuit control section.
Light source, measuring cell and receiver are three critical pieces of infrared analysis part.
There is a spiral fashion infrared origin made from nickel filament the inside of light source part, and heated radiation source sends the infrared ray of 2～12 mum wavelengths, and the reflection by minute surface in the radiation source housing becomes infrared beam.Cut the infrared light that electro-optical device sends light source and become interrupted light, namely infrared light is carried out frequency modulation (PFM), the signal that detecting device is produced becomes AC signal, is convenient to amplifier and amplifies, and can improve the response time properties of detecting device simultaneously.
Measuring cell is made up of a plurality of analysis air chambers that are arranged on the same housing.The length of analyzing air chamber is selected the size of measuring cell according to the range ability of instrument.
The receiver parts adopt the micrometeor detecting device, and it is to utilize the sensitive characteristic of sensitive element to measure the New-type detector that small gas flow changes.Its sensing element is that two miniature heater resistances and two other auxiliary resistance are formed Wheatstone bridge.The heater resistance energising is heated to uniform temperature, takes away the part heat and make the cooling of heated filament element when gas flows through, and resistance variations is transformed into the ac voltage signal that changes corresponding to tested gas concentration by electric bridge.
The circuit control section mainly is made of several partial circuits such as microprocessor, demonstration, mould/number conversion, D/A switch, temperature and controlling alarm.
The principle of work that infrared gas analyzer is measured tested gas concentration variation is as follows:
Infrared ray gas analyzer is made according to Beer law.Suppose that tested gas is a unlimited thin plane, intensity is I
0Infrared ray vertically penetrate it, then the amount of energy attenuation is:
dI＝-Ikc·dl，
Integration gets: I=I
0e
-kcl(Beer law);
In the formula: the radiation intensity that I-is absorbed by medium;
I
0-infrared ray is by the radiation intensity before the medium;
K-component to be analyzed is to the absorption coefficient of radiation wave band;
The gas concentration of c-component to be analyzed;
L-air chamber length (thickness of tested gas blanket).
For the infrared ray gas analyzer that a manufacturing has been got well, it is fixed that it measures component, and namely component to be analyzed is certain to the absorption coefficient k of radiation wave band; Infrared light supply is fixed, and namely infrared ray is by the radiation intensity I before the medium
0Necessarily; The air chamber length l is certain.From Beer law as can be seen: the decay I by the measuring radiation energy, just can determine component concentrations C to be analyzed.
The infrared gas analyzer device is based on the nondixpersive infrared absorption measuring method, and namely the selectivity principle of absorption of non-single element gas (or steam) molecule in 2～12um infrared ray spectral limit worked.
Sent the parallel beam of modulating according to certain frequency by infrared light supply, after analyzing air chamber, owing to analyze in the air chamber and absorb gas (tested gas) to ultrared absorption, convert the infrared energy variation to change in voltage by the micrometeor detecting device, and then the influence of measurement result is revised ac voltage signal according to the variation of environment temperature by the concentration correction module, and the various processing such as the amplification rectification by electric unit and control module and linearization again to revised ac voltage signal, instrument is just exported a signal corresponding with tested gas concentration variation, for showing or control.
For example, the concentration correction module comprises:
The match unit, for detection of under a plurality of ambient temperature value through the corresponding a plurality of magnitudes of voltage behind zero crossing gas of the infrared beam after the frequency modulation (PFM), according to least square method a plurality of magnitudes of voltage and corresponding a plurality of ambient temperature value are carried out match, obtain formula:
y＝Ax
2+Bx+C；
Wherein x is environment temperature, and y is the magnitude of voltage of ac voltage signal, and A, B, C are fitting coefficient;
Amending unit is used for according to following formula ac voltage signal being revised:
Wherein, a1 is the magnitude of voltage of ac voltage signal, and a2 is by formula y=Ax under the corresponding environment temperature of detectable voltage signals
2The magnitude of voltage that+Bx+C calculates, b1 are through the revised desired voltage values of excess temperature, and b2 is by formula y=Ax under the normal a certain temperature of measuring in the temperature range
2The magnitude of voltage that+Bx+C calculates (being 5-40 ℃ as normal measurement temperature range, the magnitude of voltage during desirable 15 ℃ of b2);
Circuit control unit is used for revised ac voltage signal is amplified rectification and linearization, obtains changing corresponding concentration signal for showing or control with tested gas concentration.
Fig. 1 is magnitude of voltage and temperature relation synoptic diagram according to an embodiment of the invention; The magnitude of voltage that the AD value representation changes corresponding to gas concentration in Fig. 1.When being 5-40 ℃ as normal measurement temperature range, place high-low temperature chamber to arrange 5 ℃, 15 ℃, 25 ℃, 35 ℃, 40 ℃ the infrared gas analyzer device and (also can select different temperature, but 5 ℃, 40 ℃ of two ends point values normally measuring temperature range are fixing, other three points can be got the average between 5-40 ℃, such as 14 ℃, 23 ℃, 32 ℃), feed gas at zero point, record original AD value and the detector temperature of each temperature spot correspondence respectively, can obtain the magnitude of voltage fitting formula that changes corresponding to gas concentration by the match of least square method quadratic polynomial.
Data verification is carried out in the said temperature compensation method, and the result is as shown in table 1 in the zero compensation checking.
Table 1
As can be seen from Table 1, the original AD value of instrument A is influenced by environmental temperature, but through after the temperature compensation, compensation back AD value at zero point is influenced by ambient temperature less, reaches effect temperature compensation.
The result is as shown in table 2 in terminal point temperature compensation data verification.
Table 2
As can be seen from Table 2, the original AD value of instrument A is influenced by environmental temperature, but through after the temperature compensation, compensation back terminal point AD value is influenced by ambient temperature less, reaches effect temperature compensation.
Fig. 2 detects the method flow diagram of tested gas concentration for the temperature correction that utilizes of one embodiment of the invention; As shown in Figure 2, this method may further comprise the steps:
S102, the wavelength that heated radiation source is sent are that the infrared beam of 2～12 μ m carries out frequency modulation (PFM);
S104 detects infrared beam ultrared energy variation behind the tested gas in the air chamber by analysis after frequency modulation (PFM) by the micrometeor detecting device, and converts thereof into ac voltage signal;
S106 revises ac voltage signal the influence of measurement result according to the variation of environment temperature, and revised ac voltage signal handled obtains changing corresponding concentration signal for showing or control with tested gas concentration.
For example, in the above-described embodiments, according to the variation of environment temperature the influence of measurement result is revised step to ac voltage signal and comprises:
Detect under a plurality of ambient temperature value through the corresponding a plurality of magnitudes of voltage behind zero crossing gas of the infrared beam after the frequency modulation (PFM);
According to least square method a plurality of magnitudes of voltage and corresponding a plurality of ambient temperature value are carried out match, obtain formula:
y＝Ax
2+Bx+C
Wherein x is environment temperature, and y is the magnitude of voltage of ac voltage signal, and A, B, C are fitting coefficient;
According to following formula ac voltage signal is revised:
Wherein, a1 is the magnitude of voltage of ac voltage signal, and a2 is by formula y=Ax under the corresponding environment temperature of detectable voltage signals
2The magnitude of voltage that+Bx+C calculates, b1 are through the revised desired voltage values of excess temperature, and b2 is by formula y=Ax under the normal a certain temperature of measuring in the temperature range
2The magnitude of voltage that+Bx+C calculates.Fig. 1 shows magnitude of voltage (AD value) matched curve of one embodiment of the invention.
For example, in the above-described embodiments, revised ac voltage signal handled obtaining changing corresponding concentration signal for showing or the control step comprises with tested gas concentration:
Revised ac voltage signal is amplified rectification and linearization, obtain changing corresponding concentration signal for showing or control with tested gas concentration.
From the checking result of table 1 and table 2 as can be seen, the original AD value of instrument A is influenced by environmental temperature, but through after the temperature compensation, the AD value of compensation back zero point and terminal point is influenced by ambient temperature all less, thereby improved the accuracy of tested gas detectable concentration, reached effect temperature compensation.
One of ordinary skill in the art will appreciate that: accompanying drawing is the synoptic diagram of an embodiment, and the module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device among the embodiment can be described according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of embodiment of the invention technical scheme.
Claims (3)
1. a device that utilizes the temperature correction to detect tested gas concentration is characterized in that, comprising:
Infrared origin gives off the infrared ray that wavelength is 2～12 μ m when it is heated;
Minute surface is arranged in the housing of infrared origin, is infrared beam with described infrared reflection;
Cut optical module, described infrared beam is become interrupted light, so that it is carried out frequency modulation (PFM);
Measuring cell is made up of the analysis air chamber that is arranged on the light path of warbled described infrared beam;
Ultrared energy variation behind the tested gas in micrometeor detecting device, the detection described analysis air chamber of described infrared beam process after frequency modulation (PFM), and convert thereof into ac voltage signal;
The concentration correction module, variation according to environment temperature is revised described ac voltage signal the influence of measurement result, and revised ac voltage signal handled obtains changing corresponding concentration signal for showing or control with described tested gas concentration;
Wherein, described concentration correction module comprises:
The match unit, for detection of under a plurality of ambient temperature value through the corresponding a plurality of magnitudes of voltage behind zero crossing gas of the described infrared beam after the frequency modulation (PFM), according to least square method described a plurality of magnitudes of voltage and corresponding a plurality of ambient temperature value are carried out match, obtain formula:
y=Ax
2+Bx+C
Wherein x is environment temperature, and y is the magnitude of voltage of ac voltage signal, and A, B, C are fitting coefficient;
Amending unit is used for according to following formula described ac voltage signal being revised:
Wherein, a1 is the magnitude of voltage of described ac voltage signal, and a2 is for detecting under the corresponding environment temperature of described voltage signal by formula y=Ax
2The magnitude of voltage that+Bx+C calculates, b1 are through the revised desired voltage values of excess temperature, and b2 is by formula y=Ax under the normal a certain temperature of measuring in the temperature range
2The magnitude of voltage that+Bx+C calculates;
Circuit control unit is used for revised ac voltage signal is amplified rectification and linearization, obtains changing corresponding concentration signal for showing or control with tested gas concentration.
2. a method of utilizing the temperature correction to detect tested gas concentration is characterized in that, may further comprise the steps:
The wavelength that heated radiation source is sent is that the infrared beam of 2～12 μ m carries out frequency modulation (PFM);
Detect described infrared beam ultrared energy variation behind the tested gas in the air chamber by analysis after frequency modulation (PFM) by the micrometeor detecting device, and convert thereof into ac voltage signal;
Variation according to environment temperature is revised described ac voltage signal the influence of measurement result, and revised ac voltage signal handled obtains changing corresponding concentration signal for showing or control with described tested gas concentration;
Wherein, according to the variation of environment temperature the influence of measurement result being revised step to described ac voltage signal comprises:
Detect under a plurality of ambient temperature value through the corresponding a plurality of magnitudes of voltage behind zero crossing gas of the described infrared beam after the frequency modulation (PFM);
According to least square method described a plurality of magnitudes of voltage and corresponding a plurality of ambient temperature value are carried out match, obtain formula:
y=Ax
2+Bx+C
Wherein x is environment temperature, and y is the magnitude of voltage of ac voltage signal, and A, B, C are fitting coefficient;
According to following formula described ac voltage signal is revised:
Wherein, a1 is the magnitude of voltage of described ac voltage signal, and a2 is for detecting under the corresponding environment temperature of described voltage signal by formula y=Ax
2The magnitude of voltage that+Bx+C calculates, b1 are through the revised desired voltage values of excess temperature, and b2 is by formula y=Ax under the normal a certain temperature of measuring in the temperature range
2The magnitude of voltage that+Bx+C calculates.
3. method according to claim 2 is characterized in that, revised ac voltage signal is handled obtaining the concentration signal corresponding with described tested gas concentration variation for demonstration or controlling step comprising:
Revised ac voltage signal is amplified rectification and linearization, obtain changing corresponding concentration signal for showing or control with tested gas concentration.
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| CN106970409B (en) * | 2017-05-17 | 2023-08-25 | 成都理工大学 | Gamma absorption dose rate instrument with soil humidity correction function and correction method |
| CN110208185A (en) * | 2018-08-21 | 2019-09-06 | 华帝股份有限公司 | Detection circuit for detecting smoke concentration by infrared and detection method thereof |
| CN111536950B (en) * | 2020-05-25 | 2022-05-24 | 杭州浅海科技有限责任公司 | Method for removing temperature influence of profile marine measuring instrument |
| CN112683837B (en) * | 2021-01-26 | 2023-07-21 | 杭州麦乐克科技股份有限公司 | Carbon dioxide concentration detection method based on infrared technology |
| CN112881325B (en) * | 2021-01-26 | 2022-06-17 | 杭州麦乐克科技股份有限公司 | Concentration detection method of infrared carbon dioxide sensor based on null shift estimation |
| CN113960704B (en) * | 2021-11-02 | 2023-10-27 | 深圳技术大学 | Automatic focusing method and device for liquid lens and storage medium |
| CN114034746B (en) * | 2021-11-11 | 2024-03-12 | 中煤科工集团重庆研究院有限公司 | Intelligent carbon monoxide sensor and detection method |
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| JPH06207903A (en) * | 1993-01-11 | 1994-07-26 | Chino Corp | Measuring apparatus for concentration of gas |
| CN2243656Y (en) * | 1995-07-05 | 1996-12-25 | 北京航空航天大学 | Infrared carbon dioxide analyzer |
| CN100356162C (en) * | 2004-07-07 | 2007-12-19 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for measuring gas concentration based on light source modulation |
| CN100456021C (en) * | 2006-03-24 | 2009-01-28 | 山西大学 | Technology and apparatus for detecting single-beam multi-wavelength mixed gas concentration in mine shaft |
| JP5169586B2 (en) * | 2008-07-30 | 2013-03-27 | 富士電機株式会社 | Laser gas analyzer, oxygen gas concentration measurement method |
| JP2010127923A (en) * | 2008-11-28 | 2010-06-10 | Miyama Giken:Kk | Method for temperature correction in sensor for discovering the concentration of co2 gas |
| CN101949833B (en) * | 2010-09-30 | 2012-02-15 | 中北大学 | Method for processing concentration signal of infrared gas sensor |
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