CN115165122B - Full-temperature-zone three-color temperature measurement system and temperature measurement method - Google Patents
Full-temperature-zone three-color temperature measurement system and temperature measurement method Download PDFInfo
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- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 97
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- 230000003287 optical effect Effects 0.000 claims abstract description 46
- 230000005855 radiation Effects 0.000 claims abstract description 39
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- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 18
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 18
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 15
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 14
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 14
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- 238000009628 steelmaking Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0806—Focusing or collimating elements, e.g. lenses or concave mirrors
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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Abstract
The invention provides a full-temperature zone three-color temperature measurement system and a method thereof, wherein infrared radiation energy of an object to be measured is respectively received by a bicolor detector and a pyroelectric detector through an optical system, and 3 output voltage signals are obtained through a preamplifier and a phase-locked amplifierThen signal processing is carried out by a computer, andTaking the ratio to obtain R i1, andR i2 is obtained by taking the ratio, two ratio-temperature curves are drawn, and a formula is deduced for the two curves according to a colorimetric temperature measurement theoryRespectively performing curve fitting to obtain a 300K-700K temperature measurement formula700K-1100K temperature measurement formulaThereby realizing the temperature measurement of the whole temperature area of 300K-1100K. The invention has the advantages of temperature measurement precision comparable with that of a commercial double-color thermometer, wider temperature range and wider application range, and can be used for various occasions in severe environments.
Description
Technical Field
The invention relates to the field of high-precision non-contact infrared temperature measurement, in particular to a full-temperature-area three-color infrared temperature measurement system and a temperature measurement method.
Background
The temperature is closely related to our life, and the precision requirement on various temperature measuring instruments is higher and higher due to the influence of new crown epidemic situation. The conventional temperature measurement method can be divided into contact temperature measurement and non-contact temperature measurement, wherein the contact temperature measurement mainly comprises a thermal resistor and a thermocouple, but the contact measurement inevitably affects the temperature of a measured object, and is not suitable for some scenes with severe environments, such as a strong corrosion environment, a severe climate and the like. Non-contact thermometry is being developed in order to be suitable for some industrial, military, scientific research and other production fields, for example, in the traditional industries of steelmaking metallurgy, glass production and the like; the field of manufacturing national defense military weapons such as gun powder; the scientific research fields such as high-temperature experiments and the like all need to accurately control and measure the temperature, and the accurate measurement of the temperature is closely related to the fate of people, so that the invention field is focused on accurate non-contact temperature measurement.
The non-contact temperature measurement method mainly uses infrared radiation temperature measurement, and it is known that any object with an absolute temperature greater than 0 degree can radiate infrared rays outwards, and according to kirchhoff's law, planck's law, bian-displacement law and Stefan-Boltzmann's law, the relation between the temperature and the infrared radiation can be obtained, and the temperature of the object can be deduced by measuring the intensity of the infrared radiation. However, most objects are gray bodies, and the emissivity is not 1, so that the infrared radiation temperature measurement methods such as a full radiation temperature measurement method, a brightness temperature measurement method and the like are greatly influenced by the emissivity of the measured object. The appearance of the bicolor temperature measuring method overcomes the defect, two similar wave bands are selected, the radiation energy ratio is weakened, the emissivity and the environmental factors are influenced, the existing bicolor temperature measuring instruments on the market mainly aim at measuring the temperature above high temperature (1000K), the accuracy is near 5-11K, the temperature measuring range of each bicolor temperature measuring instrument is approximately 500-800K, the wide-range temperature measurement from normal temperature to high temperature in a whole temperature area is not realized, the application scene is less, and the portability is not high. In many industrial production and scientific research fields, a single high Wen Jishi often cannot meet the temperature measurement requirement, and a plurality of pyrometers with different high temperature ranges are often required to be purchased to realize temperature measurement. In order to expand the temperature measuring range, better conform to the actual industrial production requirement and solve the problem of single application field, the invention is needed to realize a full-temperature area temperature measuring system from normal temperature to high temperature.
Disclosure of Invention
A first object of the present invention is to provide a full temperature zone three-color temperature measurement system that addresses the shortcomings of the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a full-temperature-zone three-color temperature measurement system is characterized in that: the full temperature zone three-color temperature measurement system comprises a signal detection part and a signal processing part:
The signal detection part comprises an optical system and a detector, wherein the optical system converges infrared radiation of a detected object, and the detector receives the infrared radiation of the detected object, wherein the detector comprises a bicolor detector and a pyroelectric detector, the bicolor detector is an InAsSb-Si laminated bicolor detector, the InAsSb wave band range in the bicolor detector is 1-5.5 mu m, and the peak wavelength is 4 mu m; si band range is 0.3-1.1 μm, peak wavelength is 0.9 μm; the wavelength range of the pyroelectric detector is 1-12 mu m, the optical system comprises a calcium fluoride lens, a magnesium fluoride lens, a ZnSe plano-convex lens, a half lens and a long-wave pass filter, the calcium fluoride lens with the wavelength range of 0.18-8.0 mu m is selected to be placed at the forefront end of a light path to be aligned with a measured object, the required infrared wavelength range is ensured to be 0.18-8.0 mu m, and the interference of stray light in the environment is weakened; selecting a half lens to transmit 50% of infrared light to the bicolor detector and reflect 50% of the infrared light to the pyroelectric detector; a magnesium fluoride lens with the wave band range of 0.2-6.0 mu m is selected and placed in front of the bicolor detector, infrared radiation energy is converged, the influence of other infrared wave bands is eliminated, and the temperature measurement precision is improved; a ZnSe plano-convex lens with the wave band range of 5.5-7.5 mu m is selected and placed in front of a pyroelectric detector, infrared radiation energy is converged, the influence of infrared wave bands below 5.5 mu m is eliminated, the crosstalk of two groups of voltage ratios is avoided, and the temperature measurement precision is improved;
The signal processing part is used for measuring the temperature for N times (N is more than 0 and less than or equal to 10) through the signal detection part, i is more than or equal to 1 and less than or equal to N, i represents the frequency of temperature measurement, the sampling time is 10ms, one accurate temperature measurement is completed within 1s, i represents the frequency of temperature measurement, and the ith temperature measurement releases the pyroelectric output voltage when the temperature of a measured object is T i InAsSb output voltage of bicolor detectorSi output voltageCalculated to obtainR i1 is obtained by ratio and calculatedR i2 is obtained by the ratio, firstly, whether the size of R i1 accords with the range of [11, 18] is judged, if so, R i2 is directly abandoned, and R i1 is substitutedObtaining a temperature T i, and obtaining the average value T from the obtained measurement results T 1 to T N; if the size of R i1 is not within the [11, 18] range, discarding R i1, then determining if the size of R i2 meets the (0, 11) range, if so, substituting R i2 Obtaining a temperature T i, obtaining the average value T from the obtained measurement results T 1 to T N, and if the size of R i2 is not in the (0, 11) range, discarding R i2 to indicate that the target temperature is not in the temperature measuring range of the thermometer.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
As a preferable technical scheme of the invention: the two output signals of the bicolor detector are respectively connected to the two preamplifiers, the two preamplifiers amplify the signals and then respectively input the signals to the two phase-locked amplifiers, and the output signals of the pyroelectric detector are directly connected to the third phase-locked amplifier, so that two output voltages of the bicolor detector and one output voltage of the pyroelectric detector are obtained, and crosstalk of three paths of signals is effectively avoided.
As a preferable technical scheme of the invention: the infrared radiation light source of the measured object enters the optical system after passing through the optical chopper, the optical chopper periodically blocks continuous light emitted by the light source by controlling the rotation of the blade, the optical chopper modulates the emergent light signal of the measured object, the light signal is modulated into a periodic pulse signal, the modulated emergent light signal is extracted by combining and utilizing the lock-in amplifier, and the interference of interference signal noise on the light source signal is avoided.
As a preferable technical scheme of the invention: the chopping frequency of the optical chopper was 9Hz.
Another object of the present invention is to provide a method for measuring three colors in a full temperature range.
The above object of the present invention is achieved by the following technical solutions:
S1, aligning to a measured object to start temperature measurement;
S2, infrared radiation of the object to be measured enters an optical system, firstly, the infrared radiation is converged on a semi-transparent mirror through a calcium fluoride lens, 50% of the infrared energy is converged on a magnesium fluoride lens through the magnesium fluoride lens, the interference of stray light is eliminated, the infrared energy is converged on an InAsSb-Si laminated bicolor detector, the other 50% of the infrared energy is reflected on a ZnSe planoconvex lens, the infrared energy is converged on a pyroelectric detector through the ZnSe planoconvex lens and a long-wave pass filter, the interference of infrared light below 5.5 mu m is eliminated,
S3, respectively outputting 3 output voltages by the bicolor detector and the pyroelectric detector to obtain the ith pyroelectric output voltage at the moment of T i InAsSb output VoltageSi output voltage
S4, calculating to obtainR i1 is obtained by ratio and calculatedR i2 is obtained by the ratio, whether the size of R i1 accords with the range of [11,18] is judged firstly, if so, R i2 is directly abandoned, and R i1 is substitutedObtaining a temperature T i, discarding R i1 if the size of R i1 is not within the range of [11,18], then judging whether the size of R i2 is in the range of (0, 11), if so, substituting R i2 intoThe temperature T i is obtained. If the size of R i2 is not in the (0, 11) range, discarding R i2 to indicate that the target temperature is not in the temperature measuring range of the thermometer.
S5, repeating the steps S1-S4, and obtaining the average value T from the obtained measurement results T 1 -T N.
The invention has the beneficial effects that: the invention realizes the full-temperature area and high-precision measurement by utilizing the cooperation of the optical system, the bicolor detector, the pyroelectric detector and the signal processing part; the invention utilizes the constructed optical system to avoid the influence of stray light and simultaneously can avoid optical crosstalk of 3 output responses, utilizes two detectors to realize infrared response in 3 wave band ranges, has large coverage wave band range and high sensitivity, realizes the temperature measurement in a full-temperature region from 300K normal temperature to 1100K high temperature through signal processing, has wide application scene compared with a commercial bicolor thermometer, can be used in various industrial severe environments, national defense and military industry, scientific research fields and other occasions, has simple integral structure, is convenient to use, solves the defects of large volume and wide occupation of the traditional pyrometer, and has good application prospect.
Drawings
FIG. 1 is a diagram of an optical system of a full temperature zone three-color temperature measurement system according to the present invention;
FIG. 2 is a signal processing flow chart of a full temperature zone three-color temperature measurement system according to the present invention;
FIG. 3 is a diagram showing the whole temperature measurement structure of the three-color temperature measurement system in the full temperature area;
FIG. 4 is a flow chart of a method for measuring temperature of three colors in a full temperature area according to the present invention;
FIG. 5 is a diagram of experimental data of a full temperature zone three-color temperature measurement system 300K-700K according to the present invention;
FIG. 6 is a diagram of experimental data of a full temperature zone three-color temperature measurement system 700K-1100K according to the present invention;
FIG. 7 is a diagram of the temperature measurement data error of a full temperature zone three-color temperature measurement system according to the present invention;
In the drawings, a blackbody light source 1; a chopper 2; an optical system 3; a calcium fluoride lens 301; a magnesium fluoride lens 302; znSe plano-convex lens 303; a half lens 304, a long-pass filter 305; a two-color detector 4; a pyroelectric detector 5; a first preamplifier 601; a second preamplifier 602; a first lock-in amplifier 701; a second lock-in amplifier 702; a third lock-in amplifier 703; and a computer 8.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
The invention discloses a full-temperature-zone three-color temperature measurement system, which comprises a signal detection part and a signal processing part, wherein the signal detection part comprises an optical system and a detector, the optical system is used for converging infrared radiation of a detected object, eliminating the influence of stray light in the environment, and the detector is used for receiving the infrared radiation of the detected object, wherein the detector comprises a bicolor detector and a pyroelectric detector, the bicolor detector is an InAsSb-Si laminated bicolor detector, the InAsSb wave band range in the bicolor detector is 1-5.5 mu m, and the peak wavelength is 4 mu m; si band range is 0.3-1.1 μm, peak wavelength is 0.9 μm; the band range of the pyroelectric detector is 1-12 mu m.
The optical system is formed by constructing 1 calcium fluoride lens, 1 magnesium fluoride lens, 1 ZnSe plano-convex lens, 1 semi-transparent lens and 1 long-wave-pass filter, and the calcium fluoride lens with the wave band range of 0.18-8.0 μm is selected to be placed at the forefront end of the light path to be aligned with the measured object, so that the required infrared wave band range is ensured to be 0.18-8.0 μm, and the interference of stray light in the environment is weakened; selecting a half lens to transmit 50% of infrared light to the bicolor detector and reflect 50% of the infrared light to the pyroelectric detector; a magnesium fluoride lens with the wave band range of 0.2-6.0 mu m is selected and placed in front of the bicolor detector, infrared radiation energy is converged, the influence of other infrared wave bands is eliminated, and the temperature measurement precision is improved; the ZnSe plano-convex lens with the wave band range of 5.5-7.5 mu m is selected and placed in front of the pyroelectric detector, so that the pyroelectric detector can only receive infrared wave bands with the wave band of more than 5.5 mu m and output voltage signals of the wave bands, and crosstalk is avoided when the signals are compared with the signals of the infrared wave bands with the wave band of 1-5.5 mu m received by InAsSb.
The signal processing section: the bicolor detector and the pyroelectric detector obtain three output signals, and the pyroelectric detector outputs voltage at the moment of temperature T i InAsSb output VoltageSi output voltageThe three output signals obtained by the bicolor detector and the pyroelectric detector are respectively taken by ratio values to obtainWherein R i1 is the ratio of the pyroelectric detector and InAsSb output voltage at the temperature T i between 300K and 700K, and R i2 is the ratio of Si and InAsSb output voltage at the temperature T i between 700K and 1100K.
In the infrared thermometer, the function of the optical system of the signal detection part is very important, the optical system is required to be built to ensure that the detector receives infrared energy of the detected object as much as possible, the optical system can improve the distribution of optical signals, and the infrared illumination intensity on a sensitive surface is greatly improved, so that the signal to noise ratio is improved.
The infrared radiation light source of the measured object enters the optical system after passing through the optical chopper, the optical chopper periodically blocks continuous light emitted by the light source by controlling the rotation of the blade, the optical chopper modulates the emergent light signal of the measured object, the light signal is modulated into a periodic pulse signal, the modulated emergent light signal is extracted by combining and utilizing the lock-in amplifier, and the interference of interference signal noise on the light source signal is avoided.
The optical system in the full-temperature-zone three-color temperature measurement system is shown in the figure 1, infrared radiation of an object to be measured is converged on a half lens through a calcium fluoride lens, 50% of infrared energy is converged on a magnesium fluoride lens through the lens by utilizing the principle of semi-transparent semi-reflection of the half lens, the infrared energy passes through the magnesium fluoride lens to eliminate interference of stray light, and is converged on an InAsSb-Si laminated bicolor detector, and 50% of infrared energy is reflected on a ZnSe plano-convex lens, and the infrared energy passes through the ZnSe plano-convex lens and a long-wave pass filter and is converged on a pyroelectric detector, so that interference of infrared light below 5.5 mu m is eliminated, and signal crosstalk generated when the infrared radiation energy is measured in a ratio of 1-5.5 mu m received by InAsSb is avoided to influence the temperature measurement precision.
In the full-temperature-zone three-color temperature measurement system, the optical system 3 comprises 1 calcium fluoride lens 301,1 magnesium fluoride lenses 302,1 ZnSe plano-convex lenses 303,1 semi-transparent lenses 304,1 long-wave pass filters 305.
The total temperature zone three-color temperature measurement system of the invention, wherein, the wave band range of the calcium fluoride lens 301 is 0.18-8.0 μm, the focal length is 40mm, and the calcium fluoride lens is placed at the forefront end of the light path to be aligned with the measured object, so as to converge the infrared radiation energy, ensure the infrared wave band range required by us to be 0.18-8.0 μm, and weaken the interference of stray light in the environment.
According to the full-temperature-zone three-color temperature measurement system, 50% of light can be transmitted to the double-color detector through the semi-transparent mirror 304, and 50% of light is totally reflected to the pyroelectric detector.
According to the full-temperature-zone three-color temperature measurement system, the wave band range of the magnesium fluoride lens 302 is 0.2-6.0 mu m, the focal length is 50mm, the infrared radiation energy is converged before the magnesium fluoride lens is placed in the bicolor detector, the infrared radiation energy received by the detector is ensured to be large enough, the influence of other infrared wave bands is eliminated, and the temperature measurement precision is improved.
The full-temperature-zone three-color temperature measurement system disclosed by the invention has the advantages that the wavelength range of the ZnSe planoconvex lens 303 is 5.5-7.5 mu m, the focal length is 15mm, the infrared radiation energy is converged before the system is placed in a pyroelectric detector, the influence of the infrared wavelength band below 5.5 mu m is eliminated, the signal crosstalk generated when the infrared radiation energy is measured in a ratio of 1-5.5 mu m received by InAsSb is avoided, and the temperature measurement precision is improved.
The invention relates to a full-temperature-zone three-color temperature measurement system, which adopts a double-color detector and a pyroelectric detector as core detection elements of temperature measurement equipment, wherein the double-color detector 4 is an InAsSb-Si laminated double-color detector. Wherein the InAsSb band ranges from 1 to 5.5 mu m, and the peak wavelength is 4 mu m; the Si band ranges from 0.3 to 1.1 μm, and the peak wavelength is 0.9 μm. The dual-color detector is a photovoltaic device, the Si band output of the dual-color detector 4 is firstly connected with a first preamplifier 601 and then connected with a second lock-in amplifier 701, the InAsSb band output of the dual-color detector 4 is firstly connected with a second preamplifier 602 and then connected with the second lock-in amplifier 702 to obtain an Si output voltage signal v NIR, the InAsSb output signal v MWIR is used for measuring the temperature of 700K to 1100K, the pyroelectric detector 5 is directly connected with a third lock-in amplifier 703 to obtain v LWIR, and the temperature of 300K to 700K is measured by utilizing the InAsSb output signal v MWIR and the pyroelectric detector output signal v LWIR.
The invention relates to a full-temperature-zone three-color temperature measurement system, wherein the wave band range of a pyroelectric detector is 1-12 mu m.
As shown in figure 4, the three-color temperature measurement method of the full temperature area comprises the following steps: s1, aligning to a measured object to start temperature measurement;
S2, infrared radiation of the object to be measured enters an optical system, firstly, the infrared radiation is converged on a semi-transparent mirror through a calcium fluoride lens, 50% of the infrared energy is converged on a magnesium fluoride lens through the magnesium fluoride lens, the interference of stray light is eliminated, the infrared energy is converged on an InAsSb-Si laminated bicolor detector, the other 50% of the infrared energy is reflected on a ZnSe planoconvex lens, the infrared energy is converged on a pyroelectric detector through the ZnSe planoconvex lens and a long-wave pass filter, the interference of infrared light below 5.5 mu m is eliminated,
S3, respectively outputting 3 output voltages by the bicolor detector and the pyroelectric detector to obtain the ith pyroelectric output voltage at the moment of T i InAsSb output VoltageSi output voltage
S4, calculating to obtainR i1 is obtained by ratio and calculatedR i2 is obtained by the ratio, whether the size of R i1 accords with the range of [11,18] is judged firstly, if so, R i2 is directly abandoned, and R i1 is substitutedObtaining a temperature T i, discarding R i1 if the size of R i1 is not within the range of [11,18], then judging whether the size of R i2 is in the range of (0, 11), if so, substituting R i2 intoThe temperature T i is obtained. If the size of R i2 is not in the (0, 11) range, discarding R i2 to indicate that the target temperature is not in the temperature measuring range of the thermometer.
S5, repeating the steps S1-S4, and obtaining the average value T from the obtained measurement results T 1 -T N.
In the invention, a formula T i1、Ti2 is obtained by selecting a blackbody 1 as a calibration light source for infrared radiation, setting the temperature T i of the blackbody, aligning the blackbody to start temperature measurement recording, modulating outgoing light signals of the blackbody by an optical chopper, periodically blocking continuous light emitted by the light source by the chopper by controlling rotation of a blade, and modulating the light signals into periodic pulse signals, wherein the chopping frequency selected by the chopper is 9HZ. The two detectors of the bicolor detector and the pyroelectric detector obtain 3 output voltagesThe computer will thenTaking the ratio to obtain R i1, andTaking the ratio to obtain R i2, setting and simultaneously drawing a ratio-temperature curve of 300K-700K and a ratio-temperature curve of 700K-1100K according to the Planck lawWherein M λ(Ti) is the radiation emittance, C 1 is the first radiation constant, C 2 is the second radiation constant, when two wavelengths selected by the colorimetric temperature measurement method are close, the ratio of the object emittance can be about 1, and when the temperature of the blackbody is T i, the spectral radiation emittance R (T i) corresponding to the wavelengths lambda 1 and lambda 2 can be expressed asIt can be seen that we only need to measure R (T i),λ1,λ2 to get the temperature value, but in the actual measurement process, even if the wavelength is determined by using the optical filter, there is a certain bandwidth, so we choose to draw R (T i)-Ti curve, fit the ratio-temperature formula to determine the temperature, then we choose to Is available in the form ofFrom this, we know that the temperature T i is a single-valued function of R (T i), we can determine the fitting equation used to fit the ratio-temperature equation toWherein A and B are parameters which need fitting. Performing curve fitting on the measured data, respectively using 300K-700K temperature and corresponding R value as X value and Y value, drawing a sample point diagram, and deriving a formula according to theoryFitting the function to obtainSimilarly, the temperature of 700K-1100K and the corresponding R value are respectively used as an X value and a Y value, a sample diagram at the position is drawn, and a formula is deduced according to theoryFitting the function to obtainIn the present invention, by the signal processing section: and 3 groups of signals output by the two detectors and received by infrared radiation enter a background processing terminal for processing, the ratio is obtained, a ratio-temperature curve is drawn, and a ratio-temperature formula is fitted. And finally, performing temperature calibration through repeated measurement of the temperature of the measured blackbody, so as to realize accurate temperature measurement.
In the full-temperature-zone three-color temperature measurement system, a computer 8 performs data processing, and a double-color detector 4; the pyroelectric detector 5 outputs a total of 3 output voltages,Wherein the pyroelectric output voltageInAsSb output VoltageSi output voltageThe pyroelectric output voltage is compared with the InAsSb output voltage to obtainThe ratio-temperature curve of 300K-700K is shown in figure 5, the experimentally measured data is shown as black circles in figure 5 in the temperature range of 300K-700K, the ratio is in the range of [11, 18], and the fitting formula of the fitting curve obtained by the method isComparing Si output voltage with InAsSb output voltage to obtainThe ratio-temperature curve of 700K-1100K is shown in FIG. 6, the experimentally measured data is shown as black circles in FIG. 6 in the temperature interval of 700K-1100K, the ratio ranges from (0, 11), and the fitting formula of the fitting curve obtained by the method is
In the invention, the utilization willRespectively taking the ratio to obtainSimultaneously drawing an R i1-Ti1 curve and an R i2-Ti2 curve, and deducing a formula for the two curves according to a colorimetric temperature measurement theoryAnd respectively performing curve fitting to obtain a 300K-700K temperature measurement formula and a 700K-1100K temperature measurement formula, and finally performing temperature calibration through repeated measurement on the blackbody temperature to realize accurate temperature measurement.
FIG. 7 shows a partial experimental temperature measurement data error chart of the system and method of the invention, from which a fitted curve can be seen that the temperature measurement error of 300K-1100K is about 0.01, which proves that the three-color temperature measurement system of the invention can be used for realizing measurement from normal temperature to high temperature, and the precision is comparable with that of a commercial high-temperature thermometer.
Compared with the existing thermometer, the full-temperature-zone three-color temperature measuring system and method provided by the invention have the advantages that only one detector is adopted, and the band range to which one infrared detector can respond is limited, so that the temperature measuring range is small. According to the full-temperature-zone three-color temperature measurement system, temperature measurement in a full-temperature zone is realized, and on the premise that the optical system and the detectors are simple in structure and the system is ensured to be simple and portable, infrared response in 3 wave band ranges is realized by using the two detectors. The invention provides a full-temperature-zone three-color temperature measurement system, and provides an optical system which can avoid the influence of stray light and avoid optical crosstalk of 3 output responses, and has the advantages of small number of detectors, wide coverage wave band and high sensitivity. The invention is based on an optical system, a bicolor detector and a pyroelectric detector, and can realize the three-color temperature measurement in a full-temperature region of 300K-1100K by combining signal processing and fitting a formula.
According to the full-temperature-zone three-color temperature measurement system and method, the full-temperature-zone temperature measurement is realized by utilizing the construction and signal processing part of the optical system, the precision is ensured, and the influence of emissivity and environmental temperature is reduced. The construction part of the optical system needs to ensure that all infrared energy radiated by the measured object is received as much as possible and the influence of all stray light is eliminated; different from the two-color temperature measurement method, the method is used for realizing the measurement of a full-temperature region from normal temperature to high temperature, the wave band range is necessarily wide in coverage range, so that a plurality of wave bands which are as close as possible are selected for ratio while the receiving wave band range is wide, and the influence of emissivity is reduced. In the subsequent signal processing part, the comparison value-temperature curve is fitted for a plurality of times, so that a more accurate temperature measurement formula is obtained.
Therefore, the full-temperature-zone three-color temperature measurement system and method have the characteristics of full temperature zone, high precision, wide application range and the like, can be used for various industrial severe environments, national defense and military industry, scientific research fields and other occasions, and have wide application prospects.
The above detailed description is intended to illustrate the present invention by way of example only and not to limit the invention to the particular embodiments disclosed, but to limit the invention to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A full-temperature-zone three-color temperature measurement system is characterized in that: the full temperature zone three-color temperature measurement system comprises a signal detection part and a signal processing part:
The signal detection part comprises an optical system and a detector, wherein the optical system gathers infrared radiation of a detected object, and the detector receives the infrared radiation of the detected object, wherein the detector comprises a bicolor detector and a pyroelectric detector, the bicolor detector is an InAsSb-Si laminated bicolor detector, the InAsSb wave band range in the bicolor detector is 1-5.5 mu m, and the peak wavelength is 4 mu m; si band range is 0.3-1.1 μm, peak wavelength is 0.9 μm; the wavelength range of the pyroelectric detector is 1-12 mu m, the optical system comprises a calcium fluoride lens, a magnesium fluoride lens, a ZnSe plano-convex lens, a half lens and a long-wave pass filter, the calcium fluoride lens with the wavelength range of 0.18-8.0 mu m is selected to be placed at the forefront end of a light path to be aligned with a measured object, the required infrared wavelength range is ensured to be 0.18-8.0 mu m, and the interference of stray light in the environment is weakened; selecting a half lens to transmit 50% of infrared light to the bicolor detector and reflect 50% of the infrared light to the pyroelectric detector; a magnesium fluoride lens with the wave band range of 0.2-6.0 mu m is selected and placed in front of the bicolor detector, infrared radiation energy is converged, the influence of other infrared wave bands is eliminated, and the temperature measurement precision is improved; the ZnSe plano-convex lens with the wave band range of 5.5-7.5 mu m is selected and placed in front of the pyroelectric detector, the influence of infrared wave bands below 5.5 mu m is eliminated, the crosstalk of two groups of voltage ratio values is avoided, and the temperature measurement precision is improved;
The signal processing part is used for measuring the temperature for N times (N is more than 0 and less than or equal to 10) through the signal detection part, i is more than or equal to 1 and less than or equal to N, i represents the frequency of temperature measurement, the sampling time is 10ms, one accurate temperature measurement is completed within 1s, and the ith temperature measurement outputs voltage by pyroelectric at the moment of T i when the temperature of a measured object is measured InAsSb output voltage of bicolor detectorSi output voltageCalculated to obtainR i1 is obtained by ratio and calculatedR i2 is obtained by the ratio, whether the size of R i1 accords with the range of [11,18] is judged firstly, if so, R i2 is directly abandoned, and R i1 is substitutedObtaining a temperature T i, and obtaining an average value T from the obtained measurement results T 1 to T N; if the size of R i1 is not within the [11,18] range, R i1 is discarded, then a determination is made as to whether the size of R i2 meets the (0, 11) range, if so, R i2 is substitutedObtaining a temperature T i, obtaining the average value T from the obtained measurement results T 1 to T N, and if the size of R i2 is not in the (0, 11) range, discarding R i2 to indicate that the target temperature is not in the temperature measuring range of the thermometer.
2. The full temperature zone three-color temperature measurement system of claim 1, wherein: the two output signals of the bicolor detector are respectively connected to the two preamplifiers, the two preamplifiers respectively input the amplified signals to the two phase-locked amplifiers, and the output signal of the pyroelectric detector is directly connected to the third phase-locked amplifier, so that two output voltages of the bicolor detector and one output voltage of the pyroelectric detector are obtained, and crosstalk of three paths of signals is effectively avoided.
3. The full temperature zone three-color temperature measurement system of claim 2, wherein: the infrared radiation light source of the measured object enters the optical system after passing through the optical chopper, the optical chopper periodically blocks continuous light emitted by the light source by controlling the rotation of the blade, the optical chopper modulates the emergent light signal of the measured object, the light signal is modulated into a periodic pulse signal, the modulated emergent light signal is extracted by combining and utilizing the lock-in amplifier, and the interference of interference signal noise on the light source signal is avoided.
4. A full temperature zone three-color temperature measurement system as set forth in claim 3 wherein: the chopping frequency of the optical chopper was 9HZ.
5. The full temperature zone three-color temperature measurement system of claim 1, wherein: the signal detection part measures the temperature N times, wherein N is more than 0 and less than or equal to 10.
6. A temperature measurement method for selecting the full-temperature-zone three-color temperature measurement system according to any one of claims 1 to 5, comprising the following steps:
S1, aligning to a measured object to start temperature measurement;
S2, infrared radiation of the object to be measured enters an optical system, firstly, the infrared radiation is converged on a semi-transparent mirror through a calcium fluoride lens, 50% of the infrared energy is converged on a magnesium fluoride lens through the magnesium fluoride lens, the interference of stray light is eliminated, the infrared energy is converged on an InAsSb-Si laminated bicolor detector, the other 50% of the infrared energy is reflected on a ZnSe planoconvex lens, the infrared energy is converged on a pyroelectric detector through the ZnSe planoconvex lens and a long-wave pass filter, the interference of infrared light below 5.5 mu m is eliminated,
S3, respectively outputting 3 output voltages by the bicolor detector and the pyroelectric detector to obtain the ith pyroelectric output voltage at the moment of T i InAsSb output VoltageSi output voltage
S4, calculating to obtainR i1 is obtained by ratio and calculatedR i2 is obtained by the ratio, whether the size of R i1 accords with the range of [11,18] is judged firstly, if so, R i2 is directly abandoned, and R i1 is substitutedObtaining a temperature T i, discarding R i1 if the size of R i1 is not within the range of [11,18], then judging whether the size of R i2 is in the range of (0, 11), if so, substituting R i2 intoObtaining a temperature T i; if the size of R i2 is not in the (0, 11) range, discarding R i2 to prompt that the target temperature is not in the temperature measuring range of the thermometer;
s5, repeating the steps S1-S4, and obtaining the average value T from the obtained measurement results T 1 -T N.
7. The method for measuring the temperature of the full-temperature-zone three-color temperature measuring system according to claim 6, wherein the value range of N is 0< N less than or equal to 10, i is 1 less than or equal to i less than or equal to N, the number of times of temperature measurement is represented by i, the sampling time is 10ms, and the accurate temperature measurement is ensured to be completed within 1 s.
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