ABSORPTION MEASUREMENT OF METHANE GAS WITH A BROAD-BAND LIGHT-SOURCE AND INTERFEROMETRIC SIGNAL-PROCESSING

Authors
JIN W STEWART G CULSHAW B MURRAY S PINCHBECK D
Citation
W. Jin et al., ABSORPTION MEASUREMENT OF METHANE GAS WITH A BROAD-BAND LIGHT-SOURCE AND INTERFEROMETRIC SIGNAL-PROCESSING, Optics letters, 18(16), 1993, pp. 1364-1366
Citations number
5
Categorie Soggetti
Optics
Journal title
Optics letters → ACNP
ISSN journal
01469592
Volume
18
Issue
16
Year of publication
1993
Pages
1364 - 1366
Database
ISI
SICI code
0146-9592(1993)18:16<1364:AMOMGW>2.0.ZU;2-2
Abstract
The relationship between methane concentration and second-harmonic out put of a particular optical methane-detection system is derived. The s ystem uses a broadband source and a comb filter with its transmission peaks matched to the R-branch absorption fines of methane. An optimal modulation index is obtained, and a noise-limited detection resolution of 0.02% lower explosive level (3-s time constant) is estimated.