Journal article
Voltage sensitivity response of ultrasonic hydrophones in the frequency range 0.25–2.5 MHz
Ultrasound in medicine & biology, v 25(7), pp 1131-1137
Sep 1999
PMID: 10574344
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Frequency responses of different PVDF polymer hydrophones, including membrane and needle designs, were measured and are presented in terms of end-of–cable voltage sensitivity vs. frequency over a wide, 4.5-octave bandwidth ranging from 0.25–2.5 MHz. The experimental data indicate that the membrane PVDF hydrophones can exhibit uniform, to within ± 0.75 dB, responses. However, a widely used bilaminar membrane hydrophone-preamplifier combination may display sensitivity variations of ± 2 dB. Also, even well-designed needle-type hydrophones show a more distinct sensitivity variation below 1 MHz that is on the order of 3–4 dB. The overall uncertainty of the calibration technique was estimated to be better than ± 2 dB in the frequency range considered. The technique, which uses a combination of swept frequency chirp and reciprocity so that both the relative and absolute plots of sensitivity vs. frequency can be obtained, is also briefly described. The results of this work are important to implement procedures for adequate determination of the mechanical index of ultrasound (US) imaging devices. Mechanical index is widely accepted as a predictor of potential bioeffects associated with cavitation phenomena. Also, absolute calibration data are essential in development of therapeutic procedures based on the use of high-intensity focused ultrasound (HIFU), and in characterization of conventional therapeutic US applicators operating at frequencies below 1 MHz.
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Details
- Title
- Voltage sensitivity response of ultrasonic hydrophones in the frequency range 0.25–2.5 MHz
- Creators
- Peter A Lewin (Corresponding Author) - Drexel UniversityRonald Bautista - Drexel UniversityVadivel Devaraju - Drexel University
- Publication Details
- Ultrasound in medicine & biology, v 25(7), pp 1131-1137
- Publisher
- Elsevier
- Number of pages
- 7
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000082511300012
- Scopus ID
- 2-s2.0-0032818804
- Other Identifier
- 991014878068404721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Acoustics
- Radiology, Nuclear Medicine & Medical Imaging