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Title: Design and Performance of a Sensor System for Detection of Multiple Chemicals Using an External Cavity Quantum Cascade Laser

Abstract

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 rapid wavelength tuning rate of 2265 cm 1/s (15660 nm/s) over its tuning range of 1150-1270 cm 1 (7.87-8.70 μm), 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 (NH3), and nitrous oxide (N2O) at low-ppb concentrations in field measurements of atmospheric chemical releases from a point source.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1148653
Report Number(s):
PNNL-SA-69706
NN2001000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Quantum Sensing and Nanophotonic Devices VII, January 22, 2010, San Francisco, California. Proceedings of the SPIE, 7608:Paper No. 76080D
Country of Publication:
United States
Language:
English
Subject:
(140.5965) Semiconductor lasers, quantum cascade; (300.6340) Spectroscopy, infrared; (140.3600) Lasers, tunable

Citation Formats

Phillips, Mark C., Taubman, Matthew S., Bernacki, Bruce E., Cannon, Bret D., Schiffern, John T., and Myers, Tanya L. Design and Performance of a Sensor System for Detection of Multiple Chemicals Using an External Cavity Quantum Cascade Laser. United States: N. p., 2010. Web. doi:10.1117/12.842120.
Phillips, Mark C., Taubman, Matthew S., Bernacki, Bruce E., Cannon, Bret D., Schiffern, John T., & Myers, Tanya L. Design and Performance of a Sensor System for Detection of Multiple Chemicals Using an External Cavity Quantum Cascade Laser. United States. doi:10.1117/12.842120.
Phillips, Mark C., Taubman, Matthew S., Bernacki, Bruce E., Cannon, Bret D., Schiffern, John T., and Myers, Tanya L. Sat . "Design and Performance of a Sensor System for Detection of Multiple Chemicals Using an External Cavity Quantum Cascade Laser". United States. doi:10.1117/12.842120.
@article{osti_1148653,
title = {Design and Performance of a Sensor System for Detection of Multiple Chemicals Using an External Cavity Quantum Cascade Laser},
author = {Phillips, Mark C. and Taubman, Matthew S. and Bernacki, Bruce E. and Cannon, Bret D. and Schiffern, John T. and Myers, Tanya L.},
abstractNote = {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 rapid wavelength tuning rate of 2265 cm 1/s (15660 nm/s) over its tuning range of 1150-1270 cm 1 (7.87-8.70 μm), 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 (NH3), and nitrous oxide (N2O) at low-ppb concentrations in field measurements of atmospheric chemical releases from a point source.},
doi = {10.1117/12.842120},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {1}
}

Conference:
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