Abstract
We report on a high-bandwidth, three-axis accelerometer developed with π phase-shifted fiber Bragg gratings. The gratings are inserted into a cantilever system and interrogated by three separate telecom distributed-feedback diode lasers. The lasers are frequency locked to the sensors using a radio-frequency Pound–Drever–Hall technique. This scheme reduces the effect of laser amplitude noise and allows for real-time measurements with a dynamic range greater than 50 g. An operation bandwidth of about 1000 Hz is demonstrated with minimum detectable accelerations in the order of 10 µgrms Hz−1/2 for frequencies above 10 Hz, only limited by the interrogating lasers frequency noise.
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