Radiated fields of an air-coupled ultrasonic capacitance transducer

被引:11
作者
Bashford, AG
Hutchins, DA
Schindel, DW
机构
[1] UNIV WARWICK,DEPT ENGN,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND
[2] QUEENS UNIV,DEPT PHYS,KINGSTON,ON K7L 3N6,CANADA
关键词
air-coupled; capacitance; transducers; non-contact inspection;
D O I
10.1016/0041-624X(95)00118-M
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
The use and development of ultrasonic air-coupled transducers that can operate above 100 kHz have been of recent interest. Applications of these devices include location and imaging of objects for production engineering and non destructive evaluation of materials. In previously published work, investigation into the held characteristics of ultrasonic transducers has produced a mathematical theory that models the pressure field variations for a plane piston transducer. With modification to the mathematical theory a model of the pressure field variations for a range of transducer geometries and driving signals has been developed. The pressure held of a capacitance air-coupled transducer was measured by scanning a miniature detector through the field. Thus, it was possible to compare the experimentally obtained pressure held with the theoretical pressure held. This has enabled us to design air-coupled ultrasonic transducers with optimum characteristics for air-coupled non-contact imaging of materials.
引用
收藏
页码:169 / 172
页数:4
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