Sensitive trace gas detection with cavity enhanced absorption spectroscopy using a continuous wave external-cavity quantum cascade laser
Sensitive trace gas detection with cavity enhanced absorption spectroscopy using a continuous wave external-cavity quantum cascade laser
复制标题
DOI：
10.1063/1.4823545
复制
发表时间：
2013-09-23
影响因子：
4
通讯作者：
Roepcke, J.
中科院分区：
文献类型：
--
作者：
van Helden, J. H.;Lang, N.;Roepcke, J.
使用量子级联激光器（QCL）的中红外痕量气体传感承诺高特异性和灵敏度。我们报告的性能的一个简单的腔增强吸收光谱（CEAS）传感器使用连续波外腔QCL在7.4 μ m。在625 s内获得了2.6 x 10（-8）cm（-1）的噪声等效吸收系数α（min），这对应于15毫巴空气中1327.074 cm（-1）处R（3）跃迁的CH 4检测限为6 +/- 1 ppb。这是最高值的噪声等效吸收和最长的有效路径长度（1780米）与QCL为基础的CEAS报告日期。(C)2013 AIP Publishing LLC.
Trace gas sensing in the mid-infrared using quantum cascade lasers (QCLs) promises high specificity and sensitivity. We report on the performance of a simple cavity enhanced absorption spectroscopy (CEAS) sensor using a continuous wave external-cavity QCL at 7.4 mu m. A noise-equivalent absorption coefficient alpha(min) of 2.6 x 10(-8) cm(-1) in 625 s was achieved, which corresponds to a detection limit of 6 +/- 1 ppb of CH4 in 15 millibars air for the R(3) transition at 1327.074 cm(-1). This is the highest value of noise-equivalent absorption and among the longest effective path length (1780 m) reported to date with QCL-based CEAS. (C) 2013 AIP Publishing LLC.