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Chin. Phys. B, 2018, Vol. 27(2): 024205    DOI: 10.1088/1674-1056/27/2/024205

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
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.
Keywords:  absorption linewidth      wavelength modulation spectroscopy      absorption spectroscopy      spectral line fitting      separation of harmonics  
Received:  02 November 2017      Revised:  30 November 2017      Accepted manuscript online: 
PACS:  42.60.Fc (Modulation, tuning, and mode locking)  
  42.68.Ca (Spectral absorption by atmospheric gases)  
  42.79.-e (Optical elements, devices, and systems)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61505142) and the Tianjin Natural Science Foundation (Grant No. 16JCQNJC02100).
Corresponding Authors:  Zhenhui Du     E-mail:
About author:  42.60.Fc; 42.68.Ca; 42.79.-e

Cite this article: 

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 2018 Chin. Phys. B 27 024205

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