High temperature transducer using aluminum nitride single crystal for laser ultrasound detection

Taeyang Kim; Jinwook Kim; Xiaoning Jiang

doi:10.1117/12.2259975

19 April 2017 High temperature transducer using aluminum nitride single crystal for laser ultrasound detection

Taeyang Kim, Jinwook Kim, Xiaoning Jiang

Proceedings Volume 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017; 101691H (2017) https://doi.org/10.1117/12.2259975
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2017, Portland, Oregon, United States

Abstract

In this work, a new ultrasound nondestructive testing (NDT) method based on laser-generated Lamb wave detection was proposed for high temperature (HT) NDT. Lamb waves were introduced to a stainless steel plate by the Nd:YAG pulsed laser at one point and detected by aluminum nitride (AlN) transducer at a distant position. The fundamental symmetric (S₀) and antisymmetric (A₀) mode Lamb waves were successfully propagated in the thin stainless steel plate. The time-of- flight (TOF) of the S₀ and A₀ mode waves proportionally increased with the distance (D) between the laser source and the sensor, and almost no attenuation of the amplitude was observed. For the HT NDT experiment, AlN single crystal was adopted as the ultrasonic sensor material due to its high thermal resistance of the dielectric and piezoelectric constants at the elevated temperature up to 800 °C. The combination of non-contact, portable laser source as a Lamb wave generator and temperature-robust NDT sensor made of AIN has shown its great capability to detect the Lamb waves at elevated temperatures.

Conference Presentation

Citation Download Citation

Taeyang Kim, Jinwook Kim, and Xiaoning Jiang "High temperature transducer using aluminum nitride single crystal for laser ultrasound detection", Proc. SPIE 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017, 101691H (19 April 2017); https://doi.org/10.1117/12.2259975

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