Absorption measurement of methane gas with a broadband light source and interferometric signal processing

Wei Jin, G. Stewart, B. Culshaw, S. Murray, D. Pinchbeck

Research output: Journal article publicationJournal articleAcademic researchpeer-review

70 Citations (Scopus)


The relationship between methane concentration and second-harmonic output of a particular optical methane-detection system is derived. The system uses a broadband source and a comb filter with its transmission peaks matched to the R-branch absorption lines 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.
Original languageEnglish
Pages (from-to)1364-1366
Number of pages3
JournalOptics Letters
Issue number16
Publication statusPublished - 1 Jan 1993
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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