14 June 1995 Three wavelength passive homodyne signal processing technique for miniature interferometric sensors
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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.
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Abdelouahed Ezbiri, Abdelouahed Ezbiri, Ralph P. Tatam, Ralph P. Tatam, } "Three wavelength passive homodyne signal processing technique for miniature interferometric sensors", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); doi: 10.1117/12.211865; https://doi.org/10.1117/12.211865
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