Ammonia detection by use of quartz-enhanced photoacoustic spectroscopy with a near-IR telecommunication diode laser

被引：122
作者：
Kosterev, AA [1 ]
Tittel, FK [1 ]
机构：
[1] Rice Univ, Rice Quantum Inst, Houston, TX 77251 USA
来源：
APPLIED OPTICS | 2004年 / 43卷 / 33期
关键词：
D O I：
10.1364/AO.43.006213
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A gas sensor based on quartz-enhanced photoacoustic detection and a fiber-coupled telecommunication distributed-feedback diode laser was designed and characterized for trace NH3 monitoring at a 1.53-mum wavelength (overtone absorption region). Signal and noise dependence on gas pressure were studied to optimize sensor performance. The ammonia concentration resulting in a noise-equivalent signal was found to be 0.65 parts per million by volume with 38-mW optical excitation power and a lock-in amplifier time constant of 1 s. This corresponds to a normalized absorption sensitivity of 7.2 x 10(-9) cm(-1) W/Hz(1/2), comparable with detection sensitivity achieved in conventional photoacoustic spectroscopy. The sensor architecture can be the basis for a portable gas analyzer. (C) 2004 Optical Society of America.
引用
收藏
页码：6213 / 6217
页数：5
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