Absorption linewidth inversion with wavelength modulation spectroscopy

doi:10.1088/1674-1056/27/2/024205

中国物理B ›› 2018, Vol. 27 ›› Issue (2): 24205-024205.doi: 10.1088/1674-1056/27/2/024205

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Absorption linewidth inversion with wavelength modulation spectroscopy

Yue Yan(颜悦), Zhenhui Du(杜振辉), Jinyi Li(李金义), Ruixue Wang(王瑞雪)

1. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China;
2. Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China

收稿日期:2017-11-02 修回日期:2017-11-30 出版日期:2018-02-05 发布日期:2018-02-05
通讯作者: Zhenhui Du E-mail:duzhenhui@tju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61505142) and the Tianjin Natural Science Foundation (Grant No. 16JCQNJC02100).

Absorption linewidth inversion with wavelength modulation spectroscopy

Yue Yan(颜悦)¹, Zhenhui Du(杜振辉)¹, Jinyi Li(李金义)², Ruixue Wang(王瑞雪)¹

1. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China;
2. Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China

Received:2017-11-02 Revised:2017-11-30 Online:2018-02-05 Published:2018-02-05
Contact: Zhenhui Du E-mail:duzhenhui@tju.edu.cn
About author:42.60.Fc; 42.68.Ca; 42.79.-e
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61505142) and the Tianjin Natural Science Foundation (Grant No. 16JCQNJC02100).

摘要/Abstract

摘要： For absorption linewidth inversion with wavelength modulation spectroscopy (WMS), an optimized WMS spectral line fitting method was demonstrated to infer absorption linewidth effectively, and the analytical expressions for relationships between Lorentzian linewidth and the separations of first harmonic peak-to-valley and second harmonic zero-crossing were deduced. The transition of CO₂ centered at 4991.25 cm^-1 was used to verify the optimized spectral fitting method and the analytical expressions. Results showed that the optimized spectra fitting method was able to infer absorption accurately and compute more than 10 times faster than the commonly used numerical fitting procedure. The second harmonic zero-crossing separation method calculated an even 6 orders faster than the spectra fitting without losing any accuracy for Lorentzian dominated cases. Additionally, linewidth calculated through second harmonic zero-crossing was preferred for much smaller error than the first harmonic peak-to-valley separation method. The presented analytical expressions can also be used in on-line optical sensing applications, electron paramagnetic resonance, and further theoretical characterization of absorption lineshape.

关键词: absorption linewidth, wavelength modulation spectroscopy, absorption spectroscopy, spectral line fitting, separation of harmonics

Abstract: For absorption linewidth inversion with wavelength modulation spectroscopy (WMS), an optimized WMS spectral line fitting method was demonstrated to infer absorption linewidth effectively, and the analytical expressions for relationships between Lorentzian linewidth and the separations of first harmonic peak-to-valley and second harmonic zero-crossing were deduced. The transition of CO₂ centered at 4991.25 cm^-1 was used to verify the optimized spectral fitting method and the analytical expressions. Results showed that the optimized spectra fitting method was able to infer absorption accurately and compute more than 10 times faster than the commonly used numerical fitting procedure. The second harmonic zero-crossing separation method calculated an even 6 orders faster than the spectra fitting without losing any accuracy for Lorentzian dominated cases. Additionally, linewidth calculated through second harmonic zero-crossing was preferred for much smaller error than the first harmonic peak-to-valley separation method. The presented analytical expressions can also be used in on-line optical sensing applications, electron paramagnetic resonance, and further theoretical characterization of absorption lineshape.

Key words: absorption linewidth, wavelength modulation spectroscopy, absorption spectroscopy, spectral line fitting, separation of harmonics

中图分类号: (Modulation, tuning, and mode locking)

42.60.Fc

42.68.Ca (Spectral absorption by atmospheric gases) 42.79.-e (Optical elements, devices, and systems)

颜悦, 杜振辉, 李金义, 王瑞雪. Absorption linewidth inversion with wavelength modulation spectroscopy[J]. 中国物理B, 2018, 27(2): 24205-024205.

Yue Yan(颜悦), Zhenhui Du(杜振辉), Jinyi Li(李金义), Ruixue Wang(王瑞雪). Absorption linewidth inversion with wavelength modulation spectroscopy[J]. Chin. Phys. B, 2018, 27(2): 24205-024205.

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Absorption linewidth inversion with wavelength modulation spectroscopy

Absorption linewidth inversion with wavelength modulation spectroscopy

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