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We describe a new sensitive technique for quasi-distributed measuring of temperature and strain. It is based on nonresonant point-like coupling of polarization modes in a birefringent fiber illuminated with a broad band light source. The Fourier transform of output intensity spectrum allows to interrogate simultaneously a number of in-fiber interferometers. High temperature and strain sensitivity have been achieved by using a compact CCD spectrograph.
© 1996 IEICE
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