Widely-tunable mid-infrared fiber-coupled quartz-enhanced photoacoustic sensor for environmental monitoring

被引：101
作者：
de Cumis, M. Siciliani [1 ,2 ]
Viciani, S. [1 ,2 ]
Borri, S. [1 ,2 ]
Patimisco, P. [3 ,4 ]
Sampaolo, A. [3 ,4 ]
Scamarcio, G. [3 ,4 ]
De Natale, P. [1 ,2 ]
D'Amato, F. [1 ,2 ]
Spagnolo, V. [3 ,4 ]
机构：
[1] CNR, INO, I-50019 Sesto Fiorentino, FL, Italy
[2] European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, FL, Italy
[3] Univ Bari, Dipartimento Interateneo Fis, Politecn Bari, I-70126 Bari, Italy
[4] UOS Bari, CNR, IFN, I-70126 Bari, BA, Italy
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 23期
关键词：
QUANTUM CASCADE LASER; GLASS WAVE-GUIDES; HYDROGEN-SULFIDE; QEPAS SENSOR; SPECTROSCOPY;
D O I：
10.1364/OE.22.028222
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A compact widely-tunable fiber-coupled sensor for trace gas detection of hydrogen sulfide (H2S) in the mid infrared is reported. The sensor is based on an external-cavity quantum cascade laser (EC-QCL) tunable between 7.6 and 8.3 mu m wavelengths coupled into a single-mode hollow-core waveguide. Quartz-enhanced photoacoustic spectroscopy has been selected as detecting technique. The fiber coupling system converts the astigmatic beam exiting the laser into a TEM00 mode. During a full laser scan, we observed no misalignment between the optical beam and the tuning fork, thus making our system applicable for multi-gas or broad absorber detections. The sensor has been tested on N-2:H2S gas mixtures. The minimum detectable H2S concentration is 450 ppb in similar to 3 s integration time, which is the best value till now reported in literature for H2S optical sensors. (C) 2014 Optical Society of America
引用
收藏
页码：28222 / 28231
页数：10
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