An interferometric type fiber-optic pressure sensor is constructed by attaching a 125 zm single-mode fiber inside a 1.4 mm outer diameter miniature tubing capped with a 2.5 m diaphragm. The optical fiber looks at the diaphragm displacement caused by pressure. The gap between the fiber end and the diaphragm forms a Fabry-Perot interferometer. The number of optical fringes at the output is directly related to the pressure acting on the diaphragm. A second sensor is constructed using a 925 j.m outer diameter micro bellows. The fiber-optic sensor data compares well with a strain gauge type pressure transducer.
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