Wideband spherically focused PVDF acoustic sources for calibration of ultrasound hydrophone probes

Several broadband sources have been developed for the purpose of calibrating hydrophones. The specific configuration described is intended for the calibration of hydrophones In a frequency range of 1 to 40 MHz. All devices used 25 /spl mu/m film of PVDF bonded to a matched backing. Two had radii of...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2000-11, Vol.47 (6), p.1372-1376
Main Authors: Selfridge, A., Lewin, P.A.
Format: Article
Language:English
Subjects:
Acoustic devices
Acoustic diffraction
Acoustic propagation
Acoustics
Bonding
Broadband
Calibration
Curvature
Devices
Exact sciences and technology
Frequency conversion
Frequency ranges
Fundamental areas of phenomenology (including applications)
Harmonic generations
Hydrophones
Physics
Polyvinylidene fluorides
Probes
Sonar equipment
Transduction
acoustical devices for the generation and reproduction of sound
Ultra wideband technology
Ultrasonic imaging
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Summary:Several broadband sources have been developed for the purpose of calibrating hydrophones. The specific configuration described is intended for the calibration of hydrophones In a frequency range of 1 to 40 MHz. All devices used 25 /spl mu/m film of PVDF bonded to a matched backing. Two had radii of curvatures (ROC) of 25.4 and 127 mm with f numbers of 3.8 and 19, respectively. Their active element diameter was 0.28 in (6.60 mm). The active diameter of the third source used was 25 mm, and it had an ROC of 254 mm and an f number of 10. The use of a focused element minimized frequency-dependent diffraction effects, resulting in a smooth variation of acoustic pressure at the focus from 1 to 40 MHz. Also, using a focused PVDF source permitted calibrations above 20 MHz without resorting to harmonic generation via nonlinear propagation.
ISSN:0885-3010
1525-8955
DOI:10.1109/58.883526