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THROUGH-THICKNESS CHARACTERIZATION OF SOLIDS BY WIDE-BAND AIR-COUPLED ULTRASOUND
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UNSPECIFIED (1995) THROUGH-THICKNESS CHARACTERIZATION OF SOLIDS BY WIDE-BAND AIR-COUPLED ULTRASOUND. ULTRASONICS, 33 (1). pp. 11-17. ISSN 0041-624X.
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Abstract
A non-contact inspection system employing wideband air-coupled ultrasound has been used for the characterization of thin solid material. Generation and detection of pulsed ultrasound were accomplished on opposite sides of the sample (in the through-thickness mode) using micromachined air-coupled capacitance transducers. The resulting bandwidth allowed absolute velocities and thickness changes to be estimated with reasonable accuracy (greater-than-or-equal-to 1%) for polymers, wood products, glass, and carbon-fibre reinforced polymer composites. An appreciable increase in sensitivity is shown to result for toneburst operation when the frequency matches the sample's through-thickness resonance, and this was employed for the imaging of defects in composite materials.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) R Medicine |
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Journal or Publication Title: | ULTRASONICS | ||||
Publisher: | BUTTERWORTH-HEINEMANN LTD | ||||
ISSN: | 0041-624X | ||||
Official Date: | January 1995 | ||||
Dates: |
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Volume: | 33 | ||||
Number: | 1 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 11-17 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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