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Evaluation of multiple beam interference effects in infrared gas spectroscopy

Evaluation of multiple beam interference effects in infrared gas spectroscopy
Evaluation of multiple beam interference effects in infrared gas spectroscopy
Spectral interference resulting from the tendency of infrared windows to act as low-finesse etalons is evaluated for various infrared materials. The effects temperature dependence and implications to CO2 concentration measurements is demonstrated by modelling the etalons influence on the CO2 nu(3) absorption band. It is shown that semiconductor and zinc chalcogenide windows exhibit a very strong temperature sensitivity, with lower refractive index windows, such as fluorides, having a lesser but still significant sensitivity which can lead to spurious results. Elimination of any spectral distortion or changes in concentration due to etalon effects requires the windows to be wedged with a minimum angle of approximately 1.0-0.7 mrad depending on the window material.
0957-0233
206-210
Mansfield, C.D.
2354cf62-85aa-497f-8a77-b0705e608bf3
Rutt, H.N.
e09fa327-0c01-467a-9898-4e7f0cd715fc
Mansfield, C.D.
2354cf62-85aa-497f-8a77-b0705e608bf3
Rutt, H.N.
e09fa327-0c01-467a-9898-4e7f0cd715fc

Mansfield, C.D. and Rutt, H.N. (1999) Evaluation of multiple beam interference effects in infrared gas spectroscopy. Measurement Science and Technology, 10 (3), 206-210. (doi:10.1088/0957-0233/10/3/016).

Record type: Article

Abstract

Spectral interference resulting from the tendency of infrared windows to act as low-finesse etalons is evaluated for various infrared materials. The effects temperature dependence and implications to CO2 concentration measurements is demonstrated by modelling the etalons influence on the CO2 nu(3) absorption band. It is shown that semiconductor and zinc chalcogenide windows exhibit a very strong temperature sensitivity, with lower refractive index windows, such as fluorides, having a lesser but still significant sensitivity which can lead to spurious results. Elimination of any spectral distortion or changes in concentration due to etalon effects requires the windows to be wedged with a minimum angle of approximately 1.0-0.7 mrad depending on the window material.

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More information

Published date: 1999
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 77753
URI: http://eprints.soton.ac.uk/id/eprint/77753
ISSN: 0957-0233
PURE UUID: 84c71f32-c63c-4b60-9687-9e00ed302d1e

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Date deposited: 11 Mar 2010
Last modified: 17 Jul 2019 00:14

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