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Proceedings Paper

Sensitive detection of methane at 3.3 µm using an integrating sphere and interband cascade laser
Author(s): N. M. Davis; J. Hodgkinson; D. Francis; R. P. Tatam
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Paper Abstract

Detection of methane at 3.3μm using a DFB Interband Cascade Laser and gold coated integrating sphere is performed. A 10cm diameter sphere with effective path length of 54.5cm was adapted for use as a gas cell. A comparison between this system and one using a 25cm path length single-pass gas cell is made using direct TDLS and methane concentrations between 0 and 1000 ppm. Initial investigations suggest a limit of detection of 1.0ppm for the integrating sphere and 2.2ppm for the single pass gas cell. The system has potential applications in challenging or industrial environments subject to high levels of vibration.

Paper Details

Date Published: 29 April 2016
PDF: 6 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 98990M (29 April 2016); doi: 10.1117/12.2227131
Show Author Affiliations
N. M. Davis, Cranfield Univ. (United Kingdom)
J. Hodgkinson, Cranfield Univ. (United Kingdom)
D. Francis, Cranfield Univ. (United Kingdom)
R. P. Tatam, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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