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Optical Engineering

Interband cascade laser-based sensor for ambient CH4
Author(s): David M. Sonnenfroh; Richard T. Wainner; Mark G. Allen; Ruth K. Varner
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Paper Abstract

We demonstrate a mid-IR semiconductor laser-based absorption spectrometer for field measurements of ambient CH4. The field sensor uses a type II quantum cascade laser (or interband cascade laser, ICL) operating near 3.3 µm to monitor a well-isolated line in the 3 fundamental band of CH4. The ICL operates in cw mode at cryogenic temperatures. The sensor uses a multipass cell that provides an optical path of ~7 m with a 0.25-m base path. Thermoelectrically cooled InAs detectors are used along with balanced ratiometric detection to achieve a precision of 15 ppbv for a 60-s integration time. Several successful field demonstrations are carried out at sites maintained by the University of New Hampshire.

Paper Details

Date Published: 1 November 2010
PDF: 10 pages
Opt. Eng. 49(11) 111118 doi: 10.1117/1.3498769
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
David M. Sonnenfroh, Physical Sciences Inc. (United States)
Richard T. Wainner, Physical Sciences Inc. (United States)
Mark G. Allen, Physical Sciences Inc. (United States)
Ruth K. Varner, The Univ. of New Hampshire (United States)


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