Omnidirectional bimodal Lamb wave electromagnetic acoustic transducer

• Main Authors: XIE MUWEN, WU BIN, LIU ZENGHUA, JI MEINING, HE CUNFU, HU YA'NAN
• Format: Patent
• Language: English
• Published: 11.11.2015
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses an omnidirectional bimodal Lamb wave electromagnetic acoustic transducer. The transducer is actually a two-layer coil structure integrated in a flexible circuit board; wherein the upper layer is a spiral coil and the lower layer is an annular meandered coil. The test results show that the wave electromagnetic acoustic transducer can individually excite Lamb waves with a single S0 mode and A0 mode out of an aluminum plate. Moreover, the transducer can be used to detect the defects in an aluminum plate, and the positioning precision is high. Through the scanning frequency experiments, the results show that the provided electromagnetic acoustic transducer has a good frequency response characteristic. The omnidirectional test results show that the provided electromagnetic acoustic transducer can consistently excite Lamb waves to the circumferential direction. The provided omnidirectional bimodal Lamb wave electromagnetic acoustic transducer and array thereof can be combined with imaging algorithm and data fusion arithmetic to carry out data fusion on the defect results of S0 mode detection and A0 mode detection, so the provided transducer has a great application value and potential in the field of health monitoring and non-invasive evaluation of plate structure.