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Method to minimise spurious background signals in gas detectors based on correlation spectroscopy using a Fabry-Perot by bandpass filter shape optimisation

Record type: Article

The parasitic background signal produced by gas detectors using a Fabry-Perot Interferometer (FPI) as a modulator is shown to be very sensitive to the infrared band pass filter characteristics. This parasitic signal is generally the feature limiting the sensitivity of such devices.

We review this problem, and provide a general approach to filter choice which minimises the background amplitude for this kind of detection system. It is shown that in general filters with very abrupt transitions from the stop to pass band are in fact undesirable, and fortuitously the optimum choice of filter leads to easily realised, low cost designs.

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Citation

Vargas-Rodríguez, Everardo and Rutt, Harvey N. (2005) Method to minimise spurious background signals in gas detectors based on correlation spectroscopy using a Fabry-Perot by bandpass filter shape optimisation Optical Engineering, 44, (10), pp. 1030021-7. (doi:10.1117/1.2065808).

More information

Published date: 2005
Keywords: gas detection, background modulation, amplitude modulation, rotational lines, fabry perot interferometer.

Identifiers

Local EPrints ID: 30216
URI: http://eprints.soton.ac.uk/id/eprint/30216
ISSN: 0091-3286
PURE UUID: 7ea4f08c-3646-49dd-981c-4119e398480d

Catalogue record

Date deposited: 11 May 2006
Last modified: 17 Jul 2017 15:55

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Contributors

Author: Everardo Vargas-Rodríguez
Author: Harvey N. Rutt

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