Open AccessLow-frequency fiber optic hydrophone based on weak value amplification
Author(s) -
Zhengchun Luo,
Yue Yang,
Zhongmin Wang,
Miao Yu,
Chongjian Wu,
Peng Wu,
HongLiang Cui
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.400373
Subject(s) - hydrophone , optics , underwater , sensitivity (control systems) , optical fiber , acoustics , materials science , fiber optic sensor , low frequency , physics , geology , electronic engineering , oceanography , engineering , astronomy
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 -6 Pa/Hz 1/2 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.