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Proceedings Paper

Time-division-multiplexed gas sensing system with a forward-coupled ladder topology
Author(s): Hoi Lut Ho; Wei Jin; M. Suleyman Demokan
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Paper Abstract

Quantitative measurement of gas concentration based on wavelength modulation spectroscopy and second-harmonic detection is demonstrated by applying low-frequency wavelength modulation to an external-cavity tunable diode laser. The tunable laser operating at 1.53 micrometers region is used to detect acetylene (C2H2) with laser absorption spectroscopy. A time-division multiplexed three- sensor system with a forward-coupled ladder topology have been implemented and experimentally tested. The sensor system uses single path 25 mm absorption cells and have demonstrated sensitivity of 81 ppm. The crosstalk between the sensors was found to be -30 dB. Power budget analysis shows that a sensor network consisting of 37 sensors could be realized with the same multiplexing topology.

Paper Details

Date Published: 9 May 2000
PDF: 4 pages
Proc. SPIE 4077, International Conference on Sensors and Control Techniques (ICSC 2000), (9 May 2000); doi: 10.1117/12.385547
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. 4077:
International Conference on Sensors and Control Techniques (ICSC 2000)
Desheng Jiang; Anbo Wang, Editor(s)

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