A vibration sensor, using telecommunication grade monomode fiber, immune to temperature variations
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A polarimetric fiber-optic vibration sensor immune to temperature variations is realized by forming coils using a standard single-mode fiber. The phase drift due to the linear birefringence changes induced by a modification of the environmental temperature is balanced by a feedback compression of a non vibrating coil. Experimental results show that without the feedback system the sensitivity to temperature is equal to 2%/°C. The compensated device has a maximum 10% relative variation of the output signal over a 30-55 °C range. This method is easy to implement on polarimetric sensors over any range of temperature.
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