CN115356010A - TDLAS temperature measurement absorption spectral line selection method based on temperature sensitive factors - Google Patents
TDLAS temperature measurement absorption spectral line selection method based on temperature sensitive factors Download PDFInfo
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- 230000003595 spectral effect Effects 0.000 title claims abstract description 60
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 54
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 24
- 238000010187 selection method Methods 0.000 title claims abstract description 19
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 title claims abstract 9
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000001228 spectrum Methods 0.000 claims abstract description 14
- 230000035945 sensitivity Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002004 direct laser absorption spectroscopy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001285 laser absorption spectroscopy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
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Abstract
The invention provides a TDLAS temperature measurement absorption spectral line selection method based on a temperature sensitive factor for solving the technical problems that a spectral line selection method in the existing TDLAS double-line temperature measurement application is not strong in applicability, a spectral line selection process is complex and the like. The method for selecting the absorption spectrum line can realize the selection of the temperature measurement spectrum line pair by comparing the intensity of the absorption spectrum line with the temperature sensitive factor, has simple and effective method and wide application range, and can be used for selecting the absorption spectrum lines of different gas molecules under different working conditions.
Description
Technical Field
The invention belongs to the technical field of tunable semiconductor laser absorption spectroscopy (TDLAS), and particularly relates to a TDLAS temperature measurement absorption spectral line selection method based on temperature sensitive factors.
Background
DLAS technology has wide application in non-contact temperature measurement. TDLAS temperature measurement typically uses a two-line temperature measurement method, i.e., the inversion of temperature parameters is achieved by the ratio of the absorption areas of two absorption lines. In order to ensure sufficient measurement accuracy, before the device is used, a proper absorption spectrum line pair needs to be selected according to the temperature condition of an environment to be measured, the selected absorption spectrum line is generally required to have higher absorption intensity, and the lower energy level difference of the two spectrum lines is about 1.4 times of the measured temperature.
Liu Guoyao et al (Liu Guoyao, shen Deming, chenjunjie, lixiaming, ruzhengxin, lu Rong. Selection of absorption spectrum line pair for measuring temperature of combustion gas of TDLAS. Laser application technique 2015,45 (9): 1034-1039.) propose a selection principle of 6 TDLAS temperature measurement spectrum line pairs, and select two absorption spectrum lines of water near 1547.7nm for measuring temperature of high temperature gas according to HITEMP database. The invention discloses a method for obtaining an optimal spectral line combination by calculating a standardized spectral line intensity function and solving a combination optimization problem, and is applied to the Chinese patent application No. 201811024043.8. Zhou et al (X.Zhou, J.B.Jefferies, R.K.Hanson.development of a fast temperature sensor for using a single tunable diode. Appl.Phys.B,2005, 81.
The methods are spectral line selection methods provided for specific application scenes, the spectral line selection process is complex, and partial spectral line selection conditions cannot be quantized, so that certain inconvenience is brought to practical application.
Disclosure of Invention
The invention provides a TDLAS temperature measurement absorption spectral line selection method based on temperature sensitive factors, which is used for guiding the selection of spectral line pairs and can conveniently and quickly select the temperature measurement spectral line pairs suitable for different application scenes in order to solve the technical problems that the spectral line selection method in the existing TDLAS double-line temperature measurement application is not strong in applicability, the spectral line selection process is complex and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
a TDLAS temperature measurement absorption line selection method based on temperature sensitive factors is characterized by comprising the following steps:
step 1), preliminarily estimating the temperature T and the pressure P of an environment to be detected and the mole fraction X of gas molecules to be detected, calculating the absorption spectrum a (T) of the gas molecules in the environment to be detected by using a spectrum database, and selecting an absorption spectrum line set A [ a (T) ] at the peak value of the absorption spectrum a (T);
step 2), calculating a temperature sensitive factor F (T) of each absorption spectral line of gas molecules under the environment to be detected by using a spectral database according to the estimated temperature T and pressure P of the environment to be detected and the mole fraction X of the gas molecules to be detected, and selecting an absorption spectral line set P [ F (T) ] at the peak value and an absorption spectral line set V [ F (T) ] at the valley value of the temperature sensitive factor F (T);
step 3), selecting an intersection of an absorption spectrum set A [ a (T) ] at an absorption peak value and an absorption spectrum set P [ F (T) ] at a temperature sensitive factor peak value as a high-temperature spectrum line library H (T), and selecting an intersection of the absorption spectrum set A [ a (T) ] at the absorption peak value and an absorption spectrum set V [ F (T) ] at a temperature sensitive factor valley value as a low-temperature spectrum line library C (T);
and 4) selecting one absorption spectral line from the high-temperature spectral line library H (T) and the low-temperature spectral line library C (T) respectively to form a high-low temperature absorption spectral line pair, so that high-sensitivity measurement of the environmental temperature to be measured can be realized.
Further, in step 1), when selecting the absorption spectrum line set A [ a (T) ] at the peak of the absorption spectrum a (T), setting an absorption intensity threshold value, and selecting absorption spectrum lines with absorption intensities higher than the threshold value;
the absorption intensity threshold value is 20% -50% of the maximum value of the absorption intensity.
Further, in step 2), the temperature sensitive factor F (T) is an absorption spectrum a (T) at the temperature T and a reference temperature T 0 Lower absorption spectrum a (T) 0 ) The logarithm of the ratio of the two components,
wherein, T 0 ＜T。
Further, in the step 4), two absorption spectral lines with larger temperature sensitivity factor difference corresponding to the absorption spectral lines in the high-temperature spectral line library H (T) and the low-temperature spectral line library C (T) are selected to form an absorption spectral line pair.
Further, in the step 1), the spectrum database is a HITRAN2016 database.
Further, T 0 ＝T-(1～10)。
The method can be used for selecting the TDLAS temperature measurement spectral line, can simply and quickly realize the selection of the absorption spectral line pair, and has a wider application range.
Compared with the prior art, the invention has the following beneficial technical effects:
1. according to the TDLAS temperature measurement absorption spectrum line selection method based on the temperature sensitive factors, the intensity of the absorption spectrum line is compared with the temperature sensitive factors, the selection of the temperature measurement spectrum line pair can be achieved, and the method is simple and effective.
2. The TDLAS temperature measurement absorption line selection method based on the temperature sensitive factors is wide in application range and can be used for selecting absorption lines of different gas molecules under different working conditions.
Drawings
FIG. 1 is a flow chart illustrating the steps of a TDLAS thermometric absorption line selection method based on temperature sensitive factors according to the present invention;
FIG. 2 shows the absorption spectrum of water molecules in the 1.35 μm band and the result of selecting the absorption spectrum line at the peak in the environment to be measured according to the embodiment of the present invention;
FIG. 3 shows the temperature sensitive factor distribution of each absorption spectral line of water molecules in a 1.35 μm band under a given environment to be measured in the embodiment of the present invention;
FIG. 4 shows absorption spectrum line positions corresponding to peak and valley values of temperature sensitive factors of water molecules in a 1.35 μm waveband in a to-be-measured environment according to an embodiment of the present invention;
FIG. 5 shows a high-temperature spectral line library and a low-temperature spectral line library of water molecules selected and obtained in a 1.35 μm waveband in a given environment to be tested according to an embodiment of the present invention;
fig. 6 shows the temperature sensitive factor distribution corresponding to the high and low temperature spectral line libraries of the selected water molecules in the 1.35 μm band in the environment to be measured according to the embodiment of the present invention.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, a TDLAS thermometric absorption line selection method based on temperature sensitivity factor according to the present invention is further described in detail with reference to the accompanying drawings and the following embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention.
This example provides a process of absorption spectrum pair selection using the method provided by the present invention in the application of water molecule absorption spectrum temperature measurement at 1.35 μm band. As shown in fig. 1, the method for selecting TDLAS temperature measurement absorption spectrum line based on temperature sensitive factor in this embodiment includes the following steps:
step 1), preliminarily estimating the approximate temperature of the environment to be measured to be about T =1500K, the pressure to be about P =5atm, the mole fraction of water molecules to be about X =0.2, calculating the absorption spectrum of the water molecules in the 1.35 μm wave band in the environment to be measured by using a spectrum database, setting a peak screening threshold to be 20% of the highest absorption intensity, and selecting the absorption spectrum line at the peak of the absorption spectrum, as shown in FIG. 2. The spectral database used was the HITRAN2016 database.
Step 2), calculating the temperature sensitivity factor of water molecules in a 1.35 μm wave band under the conditions of temperature T =1500K, pressure P =5atm and mole fraction X =0.2, and respectively selecting the peak value and the valley value of the temperature sensitivity factor, as shown in FIG. 3. The absorption line positions corresponding to the temperature sensitivity factor peaks and valleys are shown in fig. 4.
The temperature sensitive factor F (T) is the absorption spectrum a (T) and the reference temperature T at the temperature T 0 Lower absorption spectrum a (T) 0 ) Logarithm of the ratio, i.e.
T 0 ＜T，T 0 ＝T-(1～10)。
Step 3), selecting an absorption spectral line which is positioned at the peak of the absorption spectrum and the peak of the temperature sensitive factor at the same time as a high-temperature spectral line library; and selecting an absorption spectral line which is positioned at the peak value of the absorption spectrum and the valley value of the temperature sensitive factor at the same time as a low-temperature spectral line library. The result of selecting the high and low temperature spectral line library is shown in fig. 5, and the distribution of the temperature sensitivity factor corresponding to each spectral line is shown in fig. 6.
Step 4), in the high-temperature spectral line library, the temperature sensitive factor of the absorption spectral line at 1336.58nm is greater than 0, and the temperature sensitive factors of the other spectral lines are all less than 0, so that the 1336.58nm spectral line is selected as a high-temperature line; all absorption line temperature sensitivity factors in the low-temperature line library are smaller than 0, wherein the absolute value of the absorption line temperature sensitivity factor at 1364.68nm is the largest, and the difference value of the absorption line temperature sensitivity factor and the selected high-temperature line temperature sensitivity factor is the largest, so that the 1364.68nm line is selected as a low-temperature line. The two spectral lines are selected high and low temperature spectral line pairs. The wavelength of the selected spectral line pair is the same as that of the spectral line commonly used in the high-temperature flow field temperature measurement application, and the effectiveness of the method is verified.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. A TDLAS temperature measurement absorption spectral line selection method based on temperature sensitive factors is characterized by comprising the following steps:
step 1), preliminarily estimating the temperature T and the pressure P of an environment to be detected and the mole fraction X of gas molecules to be detected, calculating the absorption spectrum a (T) of the gas molecules in the environment to be detected by using a spectrum database, and selecting an absorption spectrum line set A [ a (T) ] at the peak value of the absorption spectrum a (T);
step 2), calculating a temperature sensitive factor F (T) of each absorption spectrum line of the gas molecules under the environment to be detected by using a spectrum database according to the estimated temperature T and pressure P of the environment to be detected and the mole fraction X of the gas molecules to be detected, and selecting an absorption spectrum line set P [ F (T) ] at the peak value and an absorption spectrum line set V [ F (T) ] at the valley value of the temperature sensitive factor F (T);
step 3), selecting the intersection of an absorption spectrum line set A [ a (T) ] at the absorption peak value and an absorption spectrum line set P [ F (T) ] at the temperature sensitive factor peak value as a high-temperature spectrum line library H (T), and selecting the intersection of the absorption spectrum line set A [ a (T) ] at the absorption peak value and an absorption spectrum line set V [ F (T) ] at the temperature sensitive factor valley value as a low-temperature spectrum line library C (T);
and 4) selecting one absorption spectral line from the high-temperature spectral line library H (T) and the low-temperature spectral line library C (T) respectively to form a high-low temperature absorption spectral line pair, so that high-sensitivity measurement of the environmental temperature to be measured can be realized.
2. The method of claim 1, wherein the TDLAS temperature measurement absorption line selection method based on temperature sensitive factor comprises:
in the step 1), when an absorption spectrum line set A [ a (T) ] at the peak value of an absorption spectrum a (T) is selected, setting an absorption intensity threshold value, and selecting an absorption spectrum line with the absorption intensity higher than the threshold value;
the absorption intensity threshold value is 20% -50% of the maximum value of the absorption intensity.
3. The method of claim 2, wherein the TDLAS temperature measurement absorption line selection method based on temperature sensitive factor comprises:
in the step 2), the temperature sensitive factor F (T) is an absorption spectrum a (T) and a reference temperature T under the temperature T 0 Lower absorption spectrum a (T) 0 ) The logarithm of the ratio of the two components,
wherein, T 0 ＜T。
4. The TDLAS thermometric absorption line selection method based on temperature sensitive factors according to claims 1-3, wherein:
and 4) selecting two absorption spectral lines with larger difference of temperature sensitivity factors corresponding to the absorption spectral lines in the high-temperature spectral line library H (T) and the low-temperature spectral line library C (T) to form an absorption spectral line pair.
5. The TDLAS thermometric absorption line selection method based on temperature sensitive factor as claimed in claim 4 wherein:
in the step 1), the spectrum database is an HITRAN2016 database.
6. The TDLAS thermometric absorption line selection method based on temperature sensitive factor as claimed in claim 5 wherein:
T 0 ＝T-(1～10)。
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| FR2658608A1 (en) * | 1990-02-22 | 1991-08-23 | Sextant Avionique | METHOD AND SYSTEM FOR OPTICALLY MEASURING AIR PRESSURE BY LASER EXCITATION, IN PARTICULAR IN FRONT OF AN AIRCRAFT. |
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