Research on Calibration-Free Fixed-Point Wavelength Modulation Spectroscopy Based on Wavenumber Drift-Correction Algorithm

被引：5
|
作者：
Zhu Yangkun [1 ]
Zhou Bin [1 ]
Wang Yihong [1 ]
Lian Jiuxiang [1 ]
Wang Hanqing [1 ]
Chen Ciwei [1 ]
机构：
[1] Southeast Univ, Sch Energy & Environm, Nanjing 210096, Jiangsu, Peoples R China
来源：
ACTA OPTICA SINICA | 2019年 / 39卷 / 08期
关键词：
spectroscopy; fixed-point wavelength modulation; calibration-free measurement; wavenumber drift of output laser center; drift-correction algorithm; TUNABLE DIODE-LASERS; TEMPERATURE;
D O I：
10.3788/AOS201939.0830001
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In the long-term operation of distributed feedback laser, there exists a problem of wavenumber drift of the output laser center; this affects the measurement accuracy of gas concentration by fixed-point wavelength modulation spectroscopy. In order to solve this problem, a calibration-free fixed-point wavelength modulation spectroscopy based on the wavenumber drift-correction algorithm is proposed for the calibration-free measurement of gas concentration. The absorption spectrum at 4958.97 cm(-1) is selected to measure the concentration of CO2 gas for validating the accuracy of this method. The experimental results show that the proposed correction algorithm overcomes the adverse effect of wavenumber drift of the output laser center on the measurement, and effectively improves the accuracy of gas-concentration measurement.
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页数：8
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