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Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry-Perot interferometer

Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry-Perot interferometer
Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry-Perot interferometer
Several designs of infrared sensors use a Fabry-Perot Interferometer (FPI) to modulate the incident light. In this work we analyse the particular case where the FPI fringes are matched with very well defined ro-vibrational absorption lines of a target molecule such as CO. In this kind of sensor modulation is induced by scanning the FPI cavity length over one half of the reference wavelength. Here we present an analytical method based on the Fourier transform which simplifies the procedure to determine the sensor response. Furthermore, this method provides a simple solution to finding the optimal FPI cavity length and mirror reflectivity. It is shown that FPI mirrors with surprisingly low reflectivity (<50%) are generally the optimum choice for target gases at atmospheric pressure. Finally experimental measurements and simulation results are presented.
0003-6935
4625-4632
Vargas-Rodríguez, Everardo
8565869a-4312-4b09-9186-7f89409b2919
Rutt, Harvey N.
e09fa327-0c01-467a-9898-4e7f0cd715fc
Vargas-Rodríguez, Everardo
8565869a-4312-4b09-9186-7f89409b2919
Rutt, Harvey N.
e09fa327-0c01-467a-9898-4e7f0cd715fc

Vargas-Rodríguez, Everardo and Rutt, Harvey N. (2007) Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry-Perot interferometer. Applied Optics, 46 (21), 4625-4632. (doi:10.1364/AO.46.004625).

Record type: Article

Abstract

Several designs of infrared sensors use a Fabry-Perot Interferometer (FPI) to modulate the incident light. In this work we analyse the particular case where the FPI fringes are matched with very well defined ro-vibrational absorption lines of a target molecule such as CO. In this kind of sensor modulation is induced by scanning the FPI cavity length over one half of the reference wavelength. Here we present an analytical method based on the Fourier transform which simplifies the procedure to determine the sensor response. Furthermore, this method provides a simple solution to finding the optimal FPI cavity length and mirror reflectivity. It is shown that FPI mirrors with surprisingly low reflectivity (<50%) are generally the optimum choice for target gases at atmospheric pressure. Finally experimental measurements and simulation results are presented.

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Published date: 20 June 2007

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Local EPrints ID: 65746
URI: http://eprints.soton.ac.uk/id/eprint/65746
ISSN: 0003-6935
PURE UUID: 7af142cf-587e-4089-a836-66a2335162b3

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Date deposited: 20 Mar 2009
Last modified: 04 Nov 2019 21:09

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