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Proceedings Paper

Quantitative measurement of acetylene by using external-cavity tunable diode laser
Author(s): Hoi Lut Ho; Wei Jin; M. Suleyman Demokan
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Paper Abstract

An external-cavity tunable diode laser operating at near-IR region is used to detect acetylene with laser absorption spectroscopy. Quantitative measurement of gas concentration is obtained by applying low-frequency wavelength modulation to the tunable laser and by phase-sensitive-detection of the fundamental and second-harmonic signals using a lock-in amplifier. A single-sensor and a time-division multiplexed two-sensor system have been implemented and experimentally tested. The sensor systems use single path 25 mm absorption cells and have demonstrated sensitivity of 75 ppm for the single sensor system and 182 ppm for the multiplexed two- sensor system.

Paper Details

Date Published: 8 December 1999
PDF: 10 pages
Proc. SPIE 3852, Harsh Environment Sensors II, (8 December 1999); doi: 10.1117/12.372834
Show Author Affiliations
Hoi Lut Ho, Hong Kong Polytechnic Univ. (Hong Kong)
Wei Jin, Hong Kong Polytechnic Univ. (Hong Kong)
M. Suleyman Demokan, Hong Kong Polytechnic Univ. (Hong Kong)


Published in SPIE Proceedings Vol. 3852:
Harsh Environment Sensors II
Anbo Wang, Editor(s)

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