An air-coupled line-focused capacitive ultrasonic transducer

被引：0
|
作者：
Robertson, TJ [1 ]
Hutchins, DA [1 ]
Billson, DR [1 ]
机构：
[1] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
来源：
2000 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2 | 2000年
关键词：
D O I：
暂无
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
A new type of air-coupled, line-focusing transducer is described. This capacitive broadband device, with an active area measuring 19.5mm x 45mm, consists of a metallised 3.5mm thick polymer film mounted over a brass backplate cylindrically concave along its length, with a radius of 28mm. Device bandwidth (-6dB) was found to be typically 200kHz to 900kHz, with a focal line width of similar to0.68 mm. A miniature air-coupled receiver was used to scan the radiated field of these devices, excited in both tone-burst and broadband mode, and the results compared to theoretical sound pressure plots using an impulse response method. A pair of devices has been used in a novel crossed arrangement to image the surface profile of solids.
引用
收藏
页码：1061 / 1064
页数：4
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