Fiber optic interferometric hydrophone using fiber Bragg grating with time division multiplexing

概要

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In this work, we propose the method of designing the reflectance distribution of FBGs to maximize the number of multiplexed hydrophones. The TDM configuration of FBG-type hydrophones is constructed, and an experiment is carried out. The experimental results show that 1) similar power pulses return from hydrophones based on the proposed reflectance distribution design method and 2) the sensitivities of hydrophones with TDM and a single configuration are similar. As a result, the effectiveness of the proposed method is exhibited. To realize an FBG-type hydrophone array system, it is desirable that bending loss should be decreased and that we have to overcome PSF (which prevents us from realizing the implementation of an FBG-type hydrophone array system). Some methods of overcoming PSF are suggested [11,12], and we will discuss them in the near future.
社団法人日本音響学会の論文