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

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 comp...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2003-11, Vol.50 (11), p.1509-1515
Main Authors: Hutchins, D.A., Doowon Choi, Davis, L.A.J., Gan, T.-H., Billson, D.R.
Format: Article
Language:English
Subjects:
Acoustic beams
Acoustic imaging
Acoustic transducers
Acoustic velocity
Acoustic waveguides
Acoustical measurements and instrumentation
Acoustics
Attenuation
Beams (radiation)
Capacitance
Carbon dioxide
Exact sciences and technology
Ferroelectric materials
Fundamental areas of phenomenology (including applications)
Image resolution
Physics
Solids
Transducers
Transduction
acoustical devices for the generation and reproduction of sound
Ultrasonic imaging
Waveguides
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Summary: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.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2003.1251134