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Chin. Opt. Lett.
 Home  List of Issues    Issue 09 , Vol. 05 , 2007    Behaviors of harmonic signals in wavelength-modulated spectroscopy under high absorption strength


Behaviors of harmonic signals in wavelength-modulated spectroscopy under high absorption strength
Yuntao Wang, Haiwen Cai, Jianxin Geng, Zhengqing Pan, Dijun Chen, Zujie Fang
[Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences], Shanghai 201800

Chin. Opt. Lett., 2007, 05(09): pp.552-555-4

DOI:
Topic:Spectroscopy
Keywords(OCIS Code): 300.1030  300.6340  300.6260  300.6380  

Abstract
Behaviors of harmonic signals in wavelength modulation spectroscopy (WMS) for gas detection with Lorentzian line under high absorption strength are investigated. Approximate analytic expressions of the second, fourth, and sixth harmonics on the strength are presented in concise forms. Simulations show that the expressions are in agreement with the Fourier expansion by numerical integration. It is expected theoretically and experimentally in a WMS system for methane detection that there are not only a maximum, but also a null point in the harmonics versus strength relations, which should be of practical importance in methane sensing applications.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Received:2007/1/11
Accepted:
Posted online:

Get Citation: Yuntao Wang, Haiwen Cai, Jianxin Geng, Zhengqing Pan, Dijun Chen, Zujie Fang, "Behaviors of harmonic signals in wavelength-modulated spectroscopy under high absorption strength," Chin. Opt. Lett. 05(09), 552-555-4(2007)

Note: Y. Wang's e-mail address is fica@163.com.



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