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Proceedings Paper

Detection of chemical clouds using widely tunable quantum cascade lasers
Author(s): Anish K. Goyal; Petros Kotidis; Erik R. Deutsch; Ninghui Zhu; Mark Norman; Jim Ye; Kostas Zafiriou; Alexander Mazurenko
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Paper Abstract

Widely tunable quantum cascade lasers (QCLs) spanning the long-wave infrared (LWIR) atmospheric transmission window and an HgCdTe detector were incorporated into a transceiver having a 50-mm-diameter transmit/receive aperture. The transceiver was used in combination with a 50-mm-diameter hollow retro-reflector for the open-path detection of chemical clouds. Two rapidly tunable external-cavity QCLs spanned the wavelength range of 7.5 to 12.8 m. Open-path transmission measurements were made over round-trip path-lengths of up to 562 meters. Freon-132a and other gases were sprayed into the beam path and the concentration-length (CL) product was measured as a function of time. The system exhibited a noise-equivalent concentration (NEC) of 3 ppb for Freon-132a given a round-trip path of 310 meters. Algorithms based on correlation methods were used to both identify the gases and determine their CLproducts as a function of time.

Paper Details

Date Published: 22 May 2015
PDF: 9 pages
Proc. SPIE 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI, 94550L (22 May 2015); doi: 10.1117/12.2177527
Show Author Affiliations
Anish K. Goyal, Block Engineering, LLC (United States)
Petros Kotidis, Block Engineering, LLC (United States)
Erik R. Deutsch, Block Engineering, LLC (United States)
Ninghui Zhu, Block Engineering, LLC (United States)
Mark Norman, Block Engineering, LLC (United States)
Jim Ye, Block Engineering, LLC (United States)
Kostas Zafiriou, Block Engineering, LLC (United States)
Alexander Mazurenko, Block Engineering, LLC (United States)


Published in SPIE Proceedings Vol. 9455:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI
Augustus Way Fountain, Editor(s)

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