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http://dx.doi.org/10.7776/ASK.2010.29.8.483

Detection of a Crack on a Plate by IDT Type Lamb Wave Sensors  

Kim, Jun-Ho (경북대학교 기계공학과)
Roh, Yong-Rae (경북대학교 기계공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.29, no.8, 2010 , pp. 483-490 More about this Journal
Abstract
In this paper, an Inter-Digital Transducer (IDT) type Lamb wave sensor is proposed to estimate the geometry and number of cracks on a plate structure, and its validity is checked through experiments. This IDT type sensor is more readily controllable than conventional patch type piezoelectric sensors to modify its operation frequency and directionality by altering its finger patterns. In this work, omni-directional annular IDT and highly directional rectangular IDT sensors are designed and fabricated. The IDT sensors are used to diagnose the length, number and orientation of cracks on an aluminum plate by measuring the amplitude and time of flight of Lamb waves. The results are analyzed to discuss the efficacy of the IDT sensors.
Keywords
Piezoelectric Sensor; IDT; Crack; Lamb Wave; Plate;
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Times Cited By KSCI : 1  (Citation Analysis)
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