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이주승(Ju Seung Lee),전병철(Byung Chul Jeon),조승현(Seung Hyun Cho),김윤영(Yoon Young Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this paper, we present a new magnetostrictive transducer capable of generating and measuring a beam-focused, non-dispersive shear-horizontal wave. In this end, a specially-configured magnetostrictive transducer, called PSA-OPMT (Planar Solenoid Array Orientation-adjustable Patch-type Magnetostrictive Transducer), is developed. It consists of a magnetic circuit composed of two permanent magnets and a PSA (planar Solenoid Array). To demonstrate its effectiveness, damage detection experiments were carried out on a 0.8 ㎜ thick aluminum plate having a 3 ㎜ hole crack. The center frequencies used were 250 ㎑ and 360 ㎑.