OPTOACOUSTIC TRACE-GAS MONITORING WITH NEAR-INFRARED DIODE-LASERS

被引：64

作者：

FEHER, M ^{[1
]}

JIANG, Y ^{[1
]}

MAIER, JP ^{[1
]}

MIKLOS, A ^{[1
]}

机构：

[1] HUNGARIAN ACAD SCI, INST ISOTOPES, H-1525 BUDAPEST, HUNGARY

来源：

APPLIED OPTICS | 1994年 / 33卷 / 09期

关键词：

D O I：

10.1364/AO.33.001655

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

An inexpensive resonant optoacoustic monitoring system using near-infrared laser diodes was developed. It was demonstrated that wavelength modulation at the resonance frequency of the cell provides a superior signal-to-noise ratio compared with amplitude modulation and eliminates background drifts and fluctuations. The system was tested out on ammonia. Its sensitivity is 8 parts in 10(9) (S/N = 1) at atmospheric pressure, which corresponds to a minimum detectable absorption coefficient of approximately 3.5 x 10(-11) cm-1 W-1. The pressure dependence of the optoacoustic resonance was also investigated. The monitor can be used as a continuous flow-through system up to a flow rate of approximately 3.5 L/min.

引用

页码：1655 / 1658

页数：4

共 21 条

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