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Phase Characteristics for PVDF Membrane Hydrophones in the Frequency Range 1-100 MHz using Nonlinear Acoustics Approach
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Phase Characteristics for PVDF Membrane Hydrophones in the Frequency Range 1-100 MHz using Nonlinear Acoustics Approach

Gaurav Gandhi, Philip Bloomfield and Peter Lewin
Journal of physics. Conference series, v 279(1), pp 8-8
30 Mar 2011
DOI: https://doi.org/10.1088/1742-6596/279/1/011002
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Abstract

Computer simulation Frequency ranges Frequency response Hydrophones Nonlinearity Polyvinylidene fluorides Mathematical Models Membranes
The purpose of this work was to develop phase calibration technique using an advanced semi-empirical computer model, which predicts the near-and the far field distributions making use of hyperbolic propagation operator, in contrast to the parabolic approximations used elsewhere. Knowledge of the relative phase shift is needed to deconvolve the pressure-time signal, and hence produce its faithful reconstruction, including the rise times and peak amplitudes. The phase responses of two PVDF membrane hydrophones - a 50 microns thick, 500 mu m diameter, bilaminar Marconi-hydrophone and a custom made Precision Acoustics, 9 mu m thick, 400 mu m diameter - were extracted from the complex frequency response of the nonlinear field simulated by the model. The simulation results were experimentally verified (uncertainties were determined at 95% confidence levels) and indicated that the nonlinear technique is well suited for membrane hydrophones having a uniform frequency response with variation in the range of + or -10 %. The primary limitations of the proposed approach will be discussed. Phase calibration of needle hydrophone probe design was also attempted, however, in this case due to presence of intrinsic resonances, a fiber optic hydrophone with a virtually flat frequency response and hence zero phase-shift in the frequency range considered was needed.

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