Quantum cascade laser based standoff photoacoustic chemical detection

被引：42

作者：

Chen, Xing ^{[1
]}

Cheng, Liwei ^{[1
]}

Guo, Dingkai ^{[1
]}

Kostov, Yordan ^{[2
]}

Choa, Fow-Sen ^{[1
]}

机构：

[1] Univ Maryland Baltimore Cty, Dept Comp Sci & Elect Engn, Baltimore, MD 21250 USA

[2] Univ Maryland Baltimore Cty, Dept Chem & Biochem Engn, Baltimore, MD 21250 USA

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 21期

关键词：

REMOTE DETECTION; SPECTROSCOPY; GAS;

D O I：

10.1364/OE.19.020251

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Standoff chemical detection with a distance of more than 41 feet using photoacoustic effect and quantum cascade laser (QCL) operated at relatively low power, less than 40 mW, is demonstrated for the first time. The option of using QCL provides the advantages of easy tuning and modulation besides the benefit of compact size, light weight and low power consumption. The standoff detection signal can be calibrated as a function of different parameters such as laser pulse energy, gas vapor concentration and detection distance. The results yield good agreements with theoretical model. Techniques to obtain even longer detection distance and achieve outdoor operations are in the process of implementation and their projection is discussed. (C) 2011 Optical Society of America

引用

页码：20251 / 20257

页数：7