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

被引：47

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

页码：323 / 328

页数：6

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