High-resolution, air-coupled ultrasonic imaging of thin materials

被引：30
|
作者：
Gan, TH [1 ]
Hutchins, DA
Billson, DR
Schindel, DW
机构：
[1] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
[2] MicroAcoust Instrument Inc, Ottawa, ON K1N 6M8, Canada
来源：
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2003年 / 50卷 / 11期
关键词：
D O I：
10.1109/TUFFC.2003.1251135
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
This paper describes the use of a focused air-coupled capacitance transducer combined with pulse compression techniques to form high-resolution images of thin materials in air. The focusing of the device is achieved by using an off axis parabolic mirror. The lateral resolution of the focused transducer, operating over a bandwidth of 1.2 MHz, was found to be less than 0.5 mm. A combination of the focused transducer as a source and a planar receiver in through-transmission mode has been developed for the measurement of different features in paper products, with a lateral resolution in through-transmission imaging of similar to0.4 mm. Images in air of thin samples such as bank notes, high-quality writing paper, stamps, and sealed joints were obtained without contact to the sample.
引用
收藏
页码：1516 / 1524
页数：9
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