An anisotropic ultrasonic transducer for Lamb wave applications

Wensong Zhou, Hui Li and Fuh-Gwo Yuan

Abstract

An anisotropic ultrasonic transducer is proposed for Lamb wave applications, such as passive damage or impact localization based on ultrasonic guided wave theory. This transducer is made from a PMNPT single crystal, and has different piezoelectric coefficients d31 and d32, which are the same for the conventional piezoelectric materials, such as Lead zirconate titanate (PZT). Different piezoelectric coefficients result in directionality of guided wave generated by this transducer, in other words, it is an anisotropic ultrasonic transducer. And thus, it has different sensitivity in comparison with conventional ultrasonic transducer. The anisotropic one can provide more information related to the direction when it is used as sensors. This paper first shows its detailed properties, including analytical formulae and finite elements simulations. Then, its application is described.

Key Words

ultrasonic transducer; anisotropic; sensing property; ultrasonic applications

Address

Wensong Zhou and Hui Li: Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China; School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China Fuh-Gwo Yuan: Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh 27695, USA

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