Based on TDLAS Technology Gas Concentration Calibration Algorithm for a Large Range

Yu JU; Hao CHEN; Li HAN; Yang CHANG; Xue-jian ZHANG

doi:10.3964/j.issn.1000-0593(2020)12-3665-05

Spectroscopy and Spectral Analysis, Volume. 40, Issue 12, 3665(2020)

Based on TDLAS Technology Gas Concentration Calibration Algorithm for a Large Range

Yu JU^1,1, Hao CHEN^1,1, Li HAN^1,1, Yang CHANG^1,1, and Xue-jian ZHANG^1,1

Author Affiliations

¹[in Chinese]

¹1. Beijing Aerospace Yilian Science and Technology Development Company, Beijing 100176, China

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Figures & Tables(9)

Fig. 1. The simulation curve of gas concentration vs Ratio

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Fig. 2. Spectra of water vapor absorption peaks in the range of 1 365 to 1 370 nm

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Fig. 3. Schematic diagram of the experimental device

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Fig. 4. Gas concentration and transmittance logarithm curve, fitting curve and relative error curve

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Fig. 5. The fitting curve of 1/c vs 1/Ratio. The fitting curve using 1/c method and relative error

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Fig. 6. Relative errors of polynomial fitting and 1/c method

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Table 1. Results of water vapor absorption spectrum intensity ratio at different concentrations

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Table 1. Results of water vapor absorption spectrum intensity ratio at different concentrations

Test Point	Ratio(TDLAS)	Vaisala
1	0.055	0.007 769
2	0.09	0.012 472
3	0.119	0.016 488
4	0.151	0.021 447
5	0.21	0.029 245
6	0.283	0.041 825
7	0.366	0.056 189
8	0.467	0.075 468
9	0.605	0.103 657
10	0.716	0.133 202
11	0.86	0.180 476
12	0.972	0.224 848
13	1.08	0.276 66
14	1.164	0.323 603
15	1.208	0.359 264
16	1.267	0.400 745
17	1.298	0.439 54
18	1.334	0.498 216

Table 2. Correlation coefficient and root mean square error of three fitting curves
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Table 2. Correlation coefficient and root mean square error of three fitting curves
Primary
polynomial Quadratic
polynomial Quintic
polynomial
R² 0.946 8 0.996 7 0.999 9
RMSE 0.031 2 0.007 8 0.001 6

Table 3. Results of polynomial fitting and 1/c method

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Table 3. Results of polynomial fitting and 1/c method

Standard Concentration	Quadratic Polynomial	Quintic Polynomial	1/c method
10%	0.098 2	0.102 6	0.102 8
20%	0.210 7	0.201 6	0.201 9
30%	0.308 3	0.301 7	0.301 4
40%	0.386 7	0.399 7	0.399 7
50%	0.451 8	0.496 6	0.500 5
60%	0.507 8	0.593 5	0.607 4
70%	0.544 4	0.664 4	0.691 1

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Yu JU, Hao CHEN, Li HAN, Yang CHANG, Xue-jian ZHANG. Based on TDLAS Technology Gas Concentration Calibration Algorithm for a Large Range[J]. Spectroscopy and Spectral Analysis, 2020, 40(12): 3665

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Paper Information

Category: Research Articles

Received: Oct. 28, 2019

Accepted: --

Published Online: Jun. 18, 2021

The Author Email:

DOI:10.3964/j.issn.1000-0593(2020)12-3665-05

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Results of water vapor absorption spectrum intensity ratio at different concentrations

Table 1. Results of water vapor absorption spectrum intensity ratio at different concentrations

Table 2. Correlation coefficient and root mean square error of three fitting curves

Table 2. Correlation coefficient and root mean square error of three fitting curves

Table 3. Results of polynomial fitting and 1/c method

Table 3. Results of polynomial fitting and 1/c method