基于光纤布拉格光栅的光纤水听器的研制。

Development of an optical fiber hydrophone with fiber Bragg grating.

作者信息

Takahashi N, Yoshimura K, Takahashi S, Imamura K

机构信息

Department of Applied Physics, National Defense Academy, Kanagawa, Japan.

出版信息

Ultrasonics. 2000 Mar;38(1-8):581-5. doi: 10.1016/s0041-624x(99)00105-5.

DOI:10.1016/s0041-624x(99)00105-5

PMID:10829730

Abstract

A new type of optical fiber hydrophone is constructed with a fiber Bragg grating (FBG) based on the intensity modulation of laser light in an FBG under the influence of sound pressure. The FBG hydrophone shows linearity, with dynamic range about 70 dB. It can measure amplitude and phase of an acoustic field in real time, and operates in a wide range of acoustic frequency, at least from 1 kHz to 3 MHz. No signal distortion is observed in the detected signal. Because of the simplicity in its operating principle and geometry, an FBG hydrophone is expected to be an acoustic sensor of high practicality compared to a conventional optical fiber hydrophone.

摘要

一种新型光纤水听器是基于光纤布拉格光栅（FBG）构建的，它利用声压作用下FBG中激光的强度调制原理。该FBG水听器具有线性度，动态范围约为70分贝。它能够实时测量声场的幅度和相位，并且在很宽的声频范围内工作，至少从1千赫到3兆赫。在检测到的信号中未观察到信号失真。由于其工作原理和结构简单，与传统光纤水听器相比，FBG水听器有望成为一种具有高度实用性的声学传感器。