Unlimited phase compensator for fiber-optic interferometric detection of slow temperature change

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Abstract
Measurement of slow temperature change by means of a Michelson-type fiber-optic interferometric sensor exploiting unlimited phase compensation is presented. A new simple phase demodulation system, based on a rotating half-wave retarder controlled by a feedback loop, permits real-time detection of a slowly induced phase change of any magnitude. A theoretical analysis of the demodulator is given, together with experimental data showing that a precision better than 1/10°C was achieved on a 1-h thermic cycle.
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