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Proceedings Paper

Characterization of a quantum cascade laser-based emissivity monitor for CORSAIR
Author(s): Maung Lwin; Michael Wojcik; Harri Latvakoski; Deron Scott; Mike Watson; Alan Marchant; Shane Topham; Martin Mlynczak
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Paper Abstract

Continuous improvements of quantum cascade laser (QCL) technology have extended the applications in environmental trace gas monitoring, mid-infrared spectroscopy in medicine and life science, law enforcement and homeland security and satellite sensor systems. We present the QCL based emissivity monitor for the CORSAIR blackbody. The emissivity of the blackbody was designed to be better than 0.9999 for the spectral range between 5 to 50μm. To actively monitor changes in blackbody emissivity we employ a QCL-based infrared illumination source. The illumination source consisted of a QCL and thermoelectric cooler (TEC) unit mounted on a copper fixture. The stability of the QCL was measured for 30, 60, and 90s operation time at 1.5A driving current. The temperature distribution along the laser mounting fixture and time dependent system heat dispersion were analyzed. The results were compared to radiative and conductive heat transfer models to define the potential laser operating time and required waiting time to return to initial temperature of the laser mount. The observed cooling behaviour is consistent with a primarily conductive heat transfer mechanism.

Paper Details

Date Published: 20 May 2011
PDF: 7 pages
Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 80123M (20 May 2011); doi: 10.1117/12.884260
Show Author Affiliations
Maung Lwin, Princeton Univ. (United States)
Space Dynamics Lab. (United States)
Michael Wojcik, Space Dynamics Lab. (United States)
Harri Latvakoski, Space Dynamics Lab. (United States)
Deron Scott, Space Dynamics Lab. (United States)
Mike Watson, Space Dynamics Lab. (United States)
Alan Marchant, Space Dynamics Lab. (United States)
Shane Topham, Space Dynamics Lab. (United States)
Martin Mlynczak, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 8012:
Infrared Technology and Applications XXXVII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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