Electromagnetic Hydrophone with Tomographic System for Absolute Velocity Field Mapping

TL;DR

This paper introduces a tomographic electromagnetic hydrophone capable of high spatial resolution ultrasonic wave velocity and pressure mapping, offering an alternative to traditional hydrophones with improved accuracy.

Contribution

The study presents a novel tomographic method for electromagnetic hydrophones that achieves submillimetric spatial resolution and provides a physical model for absolute velocity field measurements.

Findings

Achieved submillimetric spatial resolution using tomography.

Developed a physical model for absolute ultrasonic measurements.

Found an 8% pressure differential between hydrophone types.

Abstract

The velocity and pressure of an ultrasonic wave can be measured by an electromagnetic hydrophone made of a thin wire and a magnet. The ultrasonic wave vibrates the wire inside a magnetic field, inducing an electrical current. Previous articles reported poor spatial resolution of comparable hydrophones along the axis of the wire. In this study, submillimetric spatial resolution has been achieved by using a tomographic method. Moreover, a physical model is presented for obtaining absolute measurements. A pressure differential of 8% has been found between piezoelectric and electromagnetic hydrophone measurements. These characteristics show this technique as an alternative to standard hydrophones.