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Title: Investigation of interferometric noise in fiber-optic gas sensors with use of wavelength modulation spectroscopy
Authors: Jin, W 
Xu, YZ
Demokan, S
Stewart, G
Issue Date: 1-Oct-1997
Source: Applied optics, 1 Oct. 1997, v. 36, no. 28, p. 7239-7246
Abstract: We report on interferometric noise limitation of fiber-optic gas sensors with highly coherent lasers and wavelength modulation spectroscopy. Interference between signal wave and reflected waves causes signal fluctuation in the output, which limits the performance of the sensing system. Sensor resolution limited by interferometric noise is calculated for a fiber-optic gas sensor with the Q(6) absorption line of methane gas at approximately 1650 nm. The results are useful for system designers of this particular type of gas sensor.
Keywords: Fiber-optic sensors
Gas sensors
Interferometric noise
Publisher: Optical Society of America
Journal: Applied optics 
ISSN: 0003-6935
DOI: 10.1364/AO.36.007239
Rights: © 1997 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-28-7239. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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