Calculation of the ratio between the second and first harmonic signals in wavelength-modulation spectroscopy for absorption measurement

被引：9

作者：

Iseki, T ^{[1
]}

机构：

[1] Tokyo Gas Co Ltd, Tech Res Inst, Minato Ku, Tokyo 1050023, Japan

来源：

OPTICAL REVIEW | 2003年 / 10卷 / 01期

关键词：

wavelength-modulation spectroscopy; tunable diode laser; absorption measurement; ratio detection; gas sensing;

D O I：

10.1007/s10043-003-0024-9

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The dependence of the ratio between the second and first harmonic signals in wavelength-modulation spectroscopy is calculated for the precise absorption measurement that is applied to gas sensing. In the calculation, the amplitude modulation of the laser is considered as well as the frequency modulation. First, the dependence of signals on peak optical depth is discussed for the Lorentzian and Gaussian lines. Next, the dependence of signals on gas concentration is calculated in a weak absorption-limit. Finally, a numerical example is explained taking into consideration both peak optical depth and gas concentration.

引用

页码：24 / 30

页数：7

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