Abstract：
:The purpose of this research was to develop, implement and verify a measurement technique enabling rapid and dependable characterization of ultrasound hydrophone probes beyond 20 MHz. The technique employs focused acoustic sources to optimize signal-to-noise ratio and spatial averaging correction model to account for the finite aperture of the hydrophone probes. To minimize calibration time, substitution technique was chosen and its applicability was tested up to 60 MHz. The overall uncertainty of the measurements was on the order of +/- 1 dB. The results are presented for both needle and membrane type PVDF hydrophones having effective diameters ranging from 130-1200 microns. The fundamental limitations of the technique were determined and it is shown that the spatial averaging error is governed by the cross-section of the beam in the focal plane and the ratio of the effective diameters of the reference and tested hydrophone probes. The technique developed is being extended to frequencies beyond 60 MHz.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Radulescu EG,Lewin PA,Nowicki Adoi
10.1016/s0041-624x(02)00166-xsubject
Has Abstractpub_date
2002-05-01 00:00:00pages
497-501issue
1-8eissn
0041-624Xissn
1874-9968pii
S0041-624X(02)00166-Xjournal_volume
40pub_type
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