Hydrophones' effective diameter measurements as a quasi-continuous function of frequency

被引:28
作者
Radulescu, EG
Lewin, PA [1 ]
Nowicki, A
Berger, WA
机构
[1] Drexel Univ, Sch Biomed Engn Sci & Hlth Syst, Philadelphia, PA 19104 USA
[2] Drexel Univ, Dept Elect & Comp Engn, Philadelphia, PA 19104 USA
[3] Univ Scranton, Dept Phys & Elect Engn, Scranton, PA 18510 USA
[4] Polish Acad Sci, IPPT, PL-00049 Warsaw, Poland
关键词
ultrasound hydrophones; hydrophone effective diameter; hydrophone spatial averaging corrections; high frequency ultrasound; ultrasound metrology;
D O I
10.1016/S0041-624X(03)00180-X
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
The spatial averaging effect is strongly dependent on the active aperture of the hydrophone probes used to measure ultrasound fields. An experimental method was developed to determine the effective diameter of the probes as a quasi-continuous function of frequency. The implementation of the method utilizes the time delay spectrometry (TDS) technique and a set of focused acoustic sources. The use of focused sources ensured plane wave conditions for the whole frequency range and TDS eliminated all the reflections from the water tank boundaries. This approach allows effective diameter of circular aperture hydrophones to be determined as a quasi-continuous function of frequency up to 40 MHz. The measurements were performed for both needles and membrane designs having nominal diameters ranging from 50 to 500 mum. The results were successfully employed in the development of spatial averaging correction algorithms. Current efforts are being focused on extension of the frequency range up to 60 MHz by using a novel measurement technique termed time gating frequency analysis. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:635 / 641
页数:7
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