An example usage of a reflectance-based fiber-optic hydrophone in a high pressure field

Abstract

Building upon recent work on the calibration of reflectance-based fiber-optic hydrophones [1], a measurement example is presented wherein a 1.45 MHz F/1 100mm diameter source is characterized at varying levels of driving voltage, up to free-field acoustic pressure amplitudes of 80.0 MPa (peak-compression) and 13.6 MPa (peak rarefaction) with harmonic content beyond 150 MHz. The method of calibration and correction for nonlinear effects are reviewed and discussed, as are consideration of mechanical effects such as cavitation and fiber-deflection due to radiation force. [1] S. Howard and C. Zanelli, “Validation of reflectance-based fiber-optic hydrophones, International Congress on Acoustics, Aachen, Germany, 2019