科研之友
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摘要
We present a fiber Bragg grating (FBG)-based thin-film sensor for monitoring dynamic response of water pressure. The proposed pressure sensor is simply composed of a round thin film substrate and an FBG glued on the film surface across the center. The sensing characteristic of the proposed pressure sensor is analyzed from the strain distribution on the thin-film substrate with the couple-mode theory and the transfer-matrix formulation. The thin-film substrate of the FBG allows the proposed sensor to perform dynamic pressure measurement with high sensitivity. Three demodulation techniques, based on the spectrometer, the matching FRG filter, and the chirped FRG filter, are employed with the proposed FBG pressure sensor. By comparison with a commercial pressure sensor, we first demonstrate that the proposed pressure sensor is capable of detecting static pressure within 5 Pa. Then, the proposed pressure sensor is employed to measure dynamic water pressure with a resolution of a 2 Pa inside a tank of water subjected to point-wise impacts at the water surface. The experimental results clearly indicate that the proposed FBG-based thin-film sensor is capable of monitoring dynamic water pressure with high sensitivity and resolution.
- 出版日期2018-9-15
- 单位浙江大学
