PHOTOACOUSTIC DETECTION OF AMMONIA AT THE SUM AND DIFFERENCE SIDE-BAND OF THE MODULATING LASER AND STARK ELECTRIC-FIELDS

被引：9

作者：

SAUREN, H

BICANIC, D

VANASSELT, K

机构：

[1] Laser Photoacoustic Laboratory, Department of Agricultural Engineering and Physics, Agricultural University, 6701 AP Wageningen

来源：

INFRARED PHYSICS | 1991年 / 31卷 / 05期

关键词：

D O I：

10.1016/0020-0891(91)90026-C

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel scheme for on-line ammonia trace-gas detection, based on CO2 laser intermodulation photoacoustic spectroscopy incorporating high voltage Stark modulation (IMPASS), is described and its sensitivity and specificity tested in a simulated atmosphere. The complete suppression of water vapour and carbon dioxide interferences was achieved resulting in a true "on-line" detection system capable of 3 ppbv NH3 sensitivity in air. Performance of this new detection scheme (in the flowing regime) was found superior to that of the conventional photoacoustics (beam chopping mode).

引用

页码：475 / 484

页数：10

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