THROUGH-THICKNESS CHARACTERIZATION OF SOLIDS BY WIDE-BAND AIR-COUPLED ULTRASOUND
UNSPECIFIED. (1995) THROUGH-THICKNESS CHARACTERIZATION OF SOLIDS BY WIDE-BAND AIR-COUPLED ULTRASOUND. ULTRASONICS, 33 (1). pp. 11-17. ISSN 0041-624XFull text not available from this repository.
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|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
|Journal or Publication Title:||ULTRASONICS|
|Official Date:||January 1995|
|Number of Pages:||7|
|Page Range:||pp. 11-17|
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