Time-division-multiplexed gas sensing system with a forward-coupled ladder topology

Hoi Lut Ho; Wei Jin; M. Suleyman Demokan

doi:10.1117/12.385547

9 May 2000 Time-division-multiplexed gas sensing system with a forward-coupled ladder topology

Hoi Lut Ho, Wei Jin, M. Suleyman Demokan

Proceedings Volume 4077, International Conference on Sensors and Control Techniques (ICSC 2000); (2000) https://doi.org/10.1117/12.385547
Event: International Conference on Sensors and Control Techniques (ICSC2000), 2000, Wuhan, China

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.

Citation Download Citation

Hoi Lut Ho, Wei Jin, and M. Suleyman Demokan "Time-division-multiplexed gas sensing system with a forward-coupled ladder topology", Proc. SPIE 4077, International Conference on Sensors and Control Techniques (ICSC 2000), (9 May 2000); https://doi.org/10.1117/12.385547

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