A fiber optic pressure transducer.
Margerum, Gordon William
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A pressure transducer with an outside diameter of 0.190" has been built and statically tested. The transducer used a glass fiber bundle 0.109" in diameter to transmit and receive reflected light from a pressure diaphragm. The amount of light returned to a photosensor was dependent upon the diaphragm shape and relative position from the optic fiber bundle. The response was linear over a pressure range which was dependent upon the diaphragm thickness. Several fiber optic probes with different fiber distributions were tested. The random fiber distribution gave the greatest sensitivity. However, with suitable choice of gain selection, pressure range could be sacrificed for increased pressure resolution for any combination of fiber distribution and diaphragm thickness. A theory was developed for a coaxial fiber distribution with the source light transmitted by the inner circle of fibers and operating with reflection from a flat surface. The theory provided a response curve shape which compared with the measured response.
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