Effects of adsorption-desorption processes on the response time and accuracy of photoacoustic detection of ammonia

被引：63

作者：

Schmohl, A ^{[1
]}

Miklos, A ^{[1
]}

Hess, P ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Phys Chem, D-69120 Heidelberg, Germany

来源：

APPLIED OPTICS | 2001年 / 40卷 / 15期

关键词：

D O I：

10.1364/AO.40.002571

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A distributed-feedback (DFB) diode laser radiating at 1.53 mum was used for photoacoustic detection of ammonia molecules in the gas phase under Row conditions. The influence of the adsorption- desorption processes that occur at the cell and tube walls on the measured gas concentration was studied. Dramatic differences in the adsorption behavior of a metal and a polypropylene cell are demonstrated. Simulations of the gas flow and adsorption-desorption processes yield the conditions that must be fulfilled for accurate concentration measurements in trace-gas analysis of polar molecules. (C) 2001 Optical Society of America.

引用

页码：2571 / 2578

页数：8

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