Electromagnetic hydrophone for high-intensity focused ultrasound (HIFU) measurement

Abstract

The electromagnetic hydrophone studied in this article is made of a metallic wire and eight magnets. When the wire is moved by ultrasound while submitted to a magnetic field, the Lorentz force induces an electrical current. If appropriate translations and rotations of the hydrophone are made, an hydrodynamic model provides a relationship between measured electrical signal and pressure in each coordinate. However, the potential influence of wire tension on electrical signal has not been included in this model. This study shows that tension has negligible effects. Characteristics of such electromagnetic hydrophone make it potentially of great interest for High-Intensity Focused Ultrasound. © 2013 Acoustical Society of America.