A novel gas concentration monitor using a solid state modulator

Fairley, P.D. and Rutt, H.N. (2001) A novel gas concentration monitor using a solid state modulator Sensors and Actuators B: Chemical, 75, (3), pp. 192-196. (doi:10.1016/S0925-4005(01)00760-2).


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In this paper, we demonstrate the application of a novel solid state modulator in monitoring the concentration of a test gas. A widespread cost-effective method of gas concentration monitoring currently uses a blackbody source and pyroelectric detector combined with a filter to isolate the required infrared spectral region. Presently the intensity on the detector is modulated by either a mechanical chopper or by electrically-pulsing the source. The device described by this work uses a continuously-driven blackbody source with a novel solid state infrared modulator operating in the 8-14 µm band to generate the required change in intensity on the pyroelectric detector, eliminating the need for moving parts. The modulator may be incorporated into the detector’s optical window in a more-compact future device. The modulator operation is outlined, and the results of determining the concentration of SF6 test gas in a dedicated cell are compared for the solid state modulator and a mechanical chopper.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/S0925-4005(01)00760-2
ISSNs: 0925-4005 (print)
Related URLs:
Keywords: germanium, infrared, solid state, modulator, chopper, gas sensing, SF6
ePrint ID: 13667
Date :
Date Event
15 May 2001Published
Date Deposited: 12 Jan 2005
Last Modified: 16 Apr 2017 23:50
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/13667

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