Single-QCL-based absorption sensor for simultaneous trace-gas detection of CH4 and N2O

被引：92

作者：

Ren, Wei ^{[1
]}

Jiang, Wenzhe ^{[1
]}

Tittel, Frank K. ^{[1
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2014年 / 117卷 / 01期

基金：

美国国家科学基金会;

关键词：

QUANTUM CASCADE LASERS; NITROUS-OXIDE; SPECTROSCOPY; COMPACT;

D O I：

10.1007/s00340-014-5828-8

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A quantum cascade laser (QCL)-based absorption sensor for the simultaneous dual-species monitoring of CH4 and N2O was developed using a novel compact multipass gas cell (MGC). This sensor uses a thermoelectrically cooled, continuous wave, distributed feedback QCL operating at similar to 7.8 A mu m. The QCL wavelength was scanned over two neighboring CH4 (1275.04 cm(-1)) and N2O (1274.61 cm(-1)) lines at a 1 Hz repetition rate. Wavelength modulation spectroscopy (f = 10 kHz) with second harmonic (2f) detection was performed to enhance the signal-to-noise ratio. An ultra-compact MGC (16.9 cm long and a 225 ml sampling volume) was utilized to achieve an effective optical path length of 57.6 m. With such a sensor configuration, a detection limit of 5.9 ppb for CH4 and 2.6 ppb for N2O was achieved, respectively, at 1-s averaging time.

引用

页码：245 / 251

页数：7

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