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Proceedings Paper

Three wavelength passive homodyne signal processing technique for miniature interferometric sensors
Author(s): Abdelouahed Ezbiri; Ralph P. Tatam
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Paper Abstract

A passive phase stepped signal processing technique for short gauge length interferometric sensors is reported. The technique utilizes three adjacent longitudinal modes from a multimode laser diode to provide three interferometric outputs separated by a phase shift of (pi) /2. The individual outputs are wavelength division demultiplexed using a monochromator and line scan CCD and processed in real time using a PC. The technique is demonstrated for temperature measurement with a 180 micrometers low finesse fiber Fabry-Perot cavity. A 60 degrees C dynamic range and better than 0.5 degrees C resolution was obtained.

Paper Details

Date Published: 14 June 1995
PDF: 8 pages
Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); doi: 10.1117/12.211865
Show Author Affiliations
Abdelouahed Ezbiri, Cranfield Univ. (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 2544:
Interferometry VII: Techniques and Analysis
Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)

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