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Miniature surface-mountable Fabry–Perot pressure sensor constructed with a 45 ° angled fiber

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Abstract

We present a surface-mountable miniature Fabry–Perot (FP) pressure sensor that utilizes the total internal reflection at a 45° angled fiber end face to steer the optical axis by 90°. By using the fiber as a waveguide, as well as a natural mask in photolithography, an FP cavity is constructed on the sidewall of the fiber. A polymer–metal composite diaphragm is employed as the pressure transducer. The sensor exhibits a good linearity over the pressure range of 1.914.2psi, with a sensitivity of 0.009μm/psi and a hysteresis of 2.7%. This sensor is expected to impact many fronts that require reliable static pressure measurements of fluids.

© 2010 Optical Society of America

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