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Through-transmission imaging of solids in air using ultrasonic gas-jet waveguides

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5 Author(s)
Hutchins, D.A. ; Sch. of Eng., Warwick Univ., UK ; Doowon Choi ; Davis, L.A.J. ; Gan, T.-H.
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An ultrasonic waveguide has been produced in air by using a gas jet. This uses the fact that a lower acoustic velocity can be produced within the jet, relative to the air surrounding it. The lower velocity is achieved by mixing carbon dioxide with air within the jet at a concentration that is a compromise between lower acoustic velocity and increasing attenuation. Using a capacitance transducer placed within the flowing gas, it is shown that improvements in the beam width can result when the gas jet is used. Air-coupled images of solid samples have been produced in through transmission, which demonstrate that an improved lateral resolution can result when a comparison is made to images from conventional air-coupled testing.

Published in:

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

Date of Publication:

Nov. 2003

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