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


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), 1030021-7. (doi:10.1117/1.2065808).

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Original Publication URL: http://dx.doi.org/10.1117/1.2065808

Description/Abstract

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.

Item Type: Article
ISSNs: 0091-3286 (print)
Related URLs:
Keywords: gas detection, background modulation, amplitude modulation, rotational lines, fabry perot interferometer.
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 30216
Date Deposited: 11 May 2006
Last Modified: 27 Mar 2014 18:18
Contact Email Address: hnr@ecs.soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/30216

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