Ammonia trace measurements at ppb level based on near-IR photoacoustic spectroscopy

被引：46
|
作者：
Besson, J. -P. [1 ]
Schilt, S.
Rochat, E.
Thevenaz, L.
机构：
[1] Ecole Polytech Fed Lausanne, Nanophoton & Metrol Lab, CH-1015 Lausanne, Switzerland
[2] Omnisens SA, CH-1110 Morges, Switzerland
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2006年 / 85卷 / 2-3期
关键词：
D O I：
10.1007/s00340-006-2335-6
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A photoacoustic sensor using a laser diode emitting near 1532 nm in combination with an erbium-doped fibre amplifier has been developed for ammonia trace gas analysis at atmospheric pressure. NH3 concentration measurements down to 6 ppb and a noise-equivalent detection limit below 3 ppb in dry air are demonstrated. Two wavelength-modulation schemes with 1f and 2f detection using a lock-in amplifier were investigated and compared to maximise the signal-to-noise ratio. A quantitative analysis of CO2 and H2O interference with NH3 is presented. Typical concentrations present in ambient air of 400 ppm CO2 and 1.15% H2O (50% relative humidity at 20 degrees C) result in a NH3 equivalent concentration of 36 ppb and 100 ppb, respectively.
引用
收藏
页码：323 / 328
页数：6
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