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Metal-embedded fiber-optic Fabry–Perot sensors

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Abstract

The sensing of temperature and of ultrasonic pressure with fiber-optic Fabry–Perot interferometers embedded in aluminum is demonstrated. The metal parts are cast in air by using graphite molds. Breakage of the fibers at the air–metal interface during the casting process is avoided through the use of stainless-steel stress-relief tubes. The optical phase in an embedded interferometer is found to be 2.9 times more sensitive to temperature change than for the same interferometer in air, in good agreement with model calculations. An embedded interferometer has also been used to detect ultrasonic waves over the frequency range of 0.1–8 MHz.

© 1991 Optical Society of America

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