Design and performance of a sensor system for detection of multiple chemicals using an external cavity quantum cascade laser

被引：16
作者：
Phillips, Mark C. [1 ]
Taubman, Matthew S. [1 ]
Bernacki, Bruce E. [1 ]
Cannon, Bret D. [1 ]
Schiffern, John T. [1 ]
Myers, Tanya L. [1 ]
机构：
[1] Pacific NW Natl Lab, Richland, WA 99352 USA
来源：
QUANTUM SENSING AND NANOPHOTONIC DEVICES VII | 2010年 / 7608卷
关键词：
Infrared spectroscopy; quantum cascade laser; tunable laser; SPECTROSCOPY;
D O I：
10.1117/12.842120
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
We describe the performance of a sensor system designed for simultaneous detection of multiple chemicals with both broad and narrow absorption features. The sensor system consists of a broadly tunable external cavity quantum cascade laser (ECQCL), multi-pass Herriott cell, and custom low-noise electronics. The ECQCL features a fast wavelength tuning rate of 2265 cm(-1)/s (15660 nm/s) over the range of 1150-1270 cm(-1) (7.87-8.70 mu m), which permits detection of molecules with broad absorption features and dynamic concentrations, while the 0.2 cm(-1) spectral resolution of the ECQCL system allows measurement of small molecules with atmospherically broadened absorption lines. High-speed amplitude modulation and low-noise electronics are used to improve the ECQCL performance for direct absorption measurements. We demonstrate simultaneous detection of Freon-134a (1,1,1,2-tetrafluoroethane), ammonia (NH(3)), and nitrous oxide (N(2)O) at low-ppb concentrations in field measurements of atmospheric chemical releases from a point source.
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页数：11
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