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

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4 Author(s)
Gan, T.-H. ; Sch. of Eng., Warwick Univ., UK ; Hutchins, D.A. ; Billson, D.R. ; Schindel, D.W.

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 /spl sim/0.4 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.

Published in:

Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on  (Volume:50 ,  Issue: 11 )

Date of Publication:

Nov. 2003

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