1.
Opt Express
; 28(18): 25935-25948, 2020 Aug 31.
Artigo
em Inglês
| MEDLINE
| ID: mdl-32906873
RESUMO
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/Hz1/2 at 10â Hz, with a flat frequency response in the low-frequency band of 0.1-50â Hz. The experimental result agrees well with the theoretical prediction to within 0.5â dB.