Fiber-optic vector acoustic receiver based on adaptive holographic interferometer

TL;DR

This paper presents a novel fiber-optic vector acoustic receiver utilizing adaptive holographic interferometry, capable of detecting and analyzing weak acoustic signals in real-world environments through experimental validation.

Contribution

It introduces a six-channel fiber-optic coil sensor combined with an adaptive holographic interferometer for vector acoustic detection, demonstrating practical field applications.

Findings

Effective detection of weak acoustic sources in air and water

Successful implementation of adaptive holographic interferometry in fiber-optic sensors

Enhanced bearing accuracy for acoustic sources in real conditions

Abstract

A mobile scalar-vector acoustic receiver is proposed, experimentally implemented and investigated. The key components of the receiver are (i) the six-channel fiber-optic coil-type sensor configured as to detect three projections of acoustic intensity vector, (ii) the six-channel optical phase demodulator based on six-channel adaptive holographic interferometer configured with use of dynamic holograms multiplexed in a photorefractive crystal of cadmium telluride and (iii) the signals recording ADC-based system combined with software package for data processing. Field tests of the developed receiver applied for obtaining scalar and vector parameters of acoustic waves generated by a stationary and moving acoustic source in open air and water area are carried out. Experimental results show perceptiveness of use of the fiber-optical adaptive interferometry system for bearing of weak acoustic sources in real conditions.