基于弱值放大的低频光纤水听器。

Low-frequency fiber optic hydrophone based on weak value amplification.

作者信息

Luo Zhengchun, Yang Yue, Wang Zhongmin, Yu Miao, Wu Chongjian, Chang Tianying, Wu Peng, Cui Hong-Liang

出版信息

Opt Express. 2020 Aug 31;28(18):25935-25948. doi: 10.1364/OE.400373.

Abstract

A high-sensitivity low-frequency fiber optic hydrophone based on weak value amplification (WVA) is proposed and demonstrated. A polarization maintaining (PM) fiber with a length of 0.8 m wound around a polycarbonate (PC) tube is used as the sensing element. Theoretical analysis shows that the PM fiber in a WVA measurement scheme responds to underwater acoustic pressure with unprecedented sensitivity. The prototypical hydrophone based on such a scheme can sense underwater acoustic disturbance as weak as 1.3×10 Pa/Hz at 10 Hz, with a flat frequency response in the low-frequency band of 0.1-50 Hz. The experimental result agrees well with the theoretical prediction to within 0.5 dB.

摘要

提出并演示了一种基于弱值放大（WVA）的高灵敏度低频光纤水听器。将一根长度为0.8米的保偏（PM）光纤缠绕在聚碳酸酯（PC）管上用作传感元件。理论分析表明，在WVA测量方案中的保偏光纤对水下声压的响应具有前所未有的灵敏度。基于这种方案的原型水听器在10 Hz时能够检测低至1.3×10 Pa/Hz的水下声干扰，在0.1 - 50 Hz的低频带内具有平坦的频率响应。实验结果与理论预测在0.5 dB范围内吻合良好。