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 effect's temperature dependence and implications for CO\+v\2\-v\ concentration measurements are demonstrated by modelling the etalon's influe...

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Bibliographic Details
Published in:Measurement science & technology 1999-03, Vol.10 (3), p.206-210
Main Authors: Mansfield, C D, Rutt, H N
Format: Article
Language:English
Subjects:
Exact sciences and technology
Infrared spectrometers, auxiliary equipment and techniques
Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
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Summary:Spectral interference resulting from the tendency of infrared windows to act as low-finesse etalons is evaluated for various infrared materials. The effect's temperature dependence and implications for CO\+v\2\-v\ concentration measurements are demonstrated by modelling the etalon's influence on the CO\+v\2\-v\ \#n\\+v\3\-v\ 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. (Original abstract)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/10/3/016