SPECTRALLY RESOLVED DETECTION OF NH3 AT PPB LEVEL

被引：5

作者：

HENNINGSEN, J ^{[1
]}

MOGELBERG, T ^{[1
]}

HAMMERICH, M ^{[1
]}

机构：

[1] RUNGSTED GYMNASIUM,DK-2960 RUNGSTED KYST,DENMARK

来源：

JOURNAL DE PHYSIQUE IV | 1994年 / 4卷 / C7期

关键词：

D O I：

10.1051/jp4:19947117

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Photoacoustic detection of 30 ppb ammonia in air is demonstrated with a signal to noise ratio of 40, using a 400 MHz tunable CO2 laser as radiation source. Interference from CO2 is controlled by monitoring near the Doppler limit and by using phase information to separate the two signals. Wall adhesion is studied quantitatively. It is shown that the walls constitute a reservoir of fixed size, which is filled up at a fate proportional to the NH3 concentration.

引用

页码：499 / 502

页数：4

共 6 条

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