Electromagnetic tomographic ultrasonic sensor

Abstract

In this article, the spatial resolution of the Lorentz force hydrophone is studied. This hydrophone is made of a metallic wire near a magnet. When the wire is moved by ultrasound while submitted to a magnetic field, the Lorentz force induces an electrical current proportional to the integral of pressure along the wire. 2D pressure field mapping is achieved by performing a tomography through wire translations and rotations in the imaging plane. The pressure field is compared with a computer simulation and a piezoelectric hydrophone taken in the same conditions. The electromagnetic hydrophone is potentially of great interest for High-Intensity Focused Ultrasound and shockwave transducers calibration. Published by the Acoustical Society of America through the American Institute of PhysicsGrasland-Mongrain et al.