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Simple, rugged intensity type fiberoptic vibration sensors have been developed and pre-production prototypes presently are being evaluated. The transduction element consists of a pair of multimode optical fibers, one mounted on a cantilever reed, the second on a fixed anvil. At frequencies well below the reed's resonant frequency, light coupled from one fiber to the other is directly proportional to the acceleration. The basic operation characteristics of the sensors, detailed laboratory test results and preliminary field data are presented. More than fifty have been produced and many have been extensively tested. Produced in relatively small numbers, for example 25 sensors of a particular type, the price per channel, including the controller and processor, presently is several times that of conventional vibration sensors, such as piezoelectric accelerometers. In full production, however, the price should decrease substantially and approach that of conventional devices.