ファイバブラッググレーティングを用いた振動計
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概要
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We have fabricated a vibration sensor using fiber Bragg gratings. A light-voltage conversion circuit is designed, and the vibration sensor is constructed for monitoring broadband vibrations. The conversion circuit consists of a transimpedance amplifier including a photodiode and an inverting amplifier with a 20-dB gain. The circuit has a monitoring port to measure the direct current through the photodiode. By monitoring and stabilizing the direct current, a reproducible vibration sensing can be achieved. The 3 dB frequency bandwidth of the circuit was measured to be from 3 Hz to 60 kHz. To evaluate the fabricated vibration sensor, we have conducted impact tests. In response to the impact to a metallic plate, vibrating waveforms were observed, and components from 2 kHz to 60 kHz were observed with in Fourier spectrum.
- 2014-03-31
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