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Multimode optical-fiber loss-modulation acoustic sensor

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Abstract

We have measured the loss coefficient of the simple bending-loss transducer shown schematically in Fig. 1. The transducer structure consists of two mating, ridged plates (2.5 cm x 6 cm). The fiber is placed between the two plates and compressed with a variable load, and the resulting transmission loss is measured. We have investigated the response of various fiber types and also the effects of initial launch conditions. Figure 2 shows data from a short (2-m) length of Corning step-index fiber.

© 1979 Optical Society of America

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