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Journal article
Nonlinear acoustics determination of phase characteristics of PVDF membrane hydrophones
Journal of physics. Conference series, v 279(1), 012001
01 Feb 2011
Abstract
When an ultrasonic pressure wave propagates through a nonlinear medium, the relative phasing of the generated harmonics causes a distinct asymmetry between the positive and negative pressure levels and between the rise and fall time of examined waveforms. A faithful quantitative reproduction of the source transducer's pressure field requires amplitude and phase measurements by calibrated hydrophone probes. Nonlinear hydrophone calibration provides amplitude and phase information at discrete multiples of an acoustic source's fundamental frequency. Two PVDF bilaminar membrane hydrophones were first calibrated in terms of their amplitude sensitivity to the pressure levels generated by two different HIFU (High Intensity Focused Ultrasound) circular source transducers operating at 5 MHz and 10 MHz, enabling phase studies up to 105 and 100 MHz, respectively. Introducing two newly-developed phase-dispersion representations, the phase responses of the two membrane hydrophones were determined with respect to the phase of the complex frequency response extracted from the nonlinear field simulated by a semi-empirical computer model which predicts the near and the far field pressure distributions. These phase differences compared favorably with the results obtained from the commercially available PiezoCAD simulation model. The protocol for specifying the complex pressure field of source transducers through measurements using the calibrated hydrophones is described. The results obtained indicate that the membranes exhibit close to linear decay of phase against the frequency.
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2 citations in Scopus
Details
- Title
- Nonlinear acoustics determination of phase characteristics of PVDF membrane hydrophones
- Creators
- Philip E Bloomfield - Drexel University, School of Biomedical Engineering, Science, and Health SystemsGaurav Gandhi - Artann Laboratories, Inc.Peter Lewin - Drexel University, School of Biomedical Engineering, Science, and Health Systems
- Publication Details
- Journal of physics. Conference series, v 279(1), 012001
- Conference
- Advanced Metrology for Ultrasound in Medicine (AMUM 2010) (Teddington, United Kingdom, 12 May 2010–14 May 2010)
- Publisher
- IOP Publishing
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems
- Scopus ID
- 2-s2.0-79959461090
- Other Identifier
- 991019173795904721