High-temperature (> 1000 C) acoustic emission sensor

Joseph A. Johnson; Kyungrim Kim; Shujun Zhang; Di Wu; Xiaoning Jiang

doi:10.1117/12.2009301

16 April 2013 High-temperature (> 1000 °C) acoustic emission sensor

Joseph A. Johnson, Kyungrim Kim, Shujun Zhang, Di Wu, Xiaoning Jiang

Proceedings Volume 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013; 869428 (2013) https://doi.org/10.1117/12.2009301
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

Abstract

Piezoelectric crystals have shown promising results as acoustic emission sensors, but are often hindered by the loss of electric properties above temperatures in the 500-700°C range. Yttrium calcium oxyborate, (YCOB), however, is a promising high temperature piezoelectric material due to its high resistivity at high temperatures and its relatively stable electromechanical and piezoelectric properties across a broad temperature range. In this paper, a piezoelectric acoustic emission sensor was designed, fabricated, and tested for use in high temperature applications using a YCOB single crystal. An acoustic wave was generated by a Hsu-Nielsen source on a stainless steel bar, which then propagated through the substrate into a furnace where the YCOB acoustic emission sensor is located. Charge output of the YCOB sensor was collected using a lock-in charge amplifier. The sensitivity of the YCOB sensor was found to have small to no degradation with increasing temperature up to 1000 °C. This oxyborate crystal showed the ability to detect zero order symmetric and antisymmetric modes, as well as distinguishable first order antisymmetric modes at elevated temperatures up to 1000 °C.

Citation Download Citation

Joseph A. Johnson, Kyungrim Kim, Shujun Zhang, Di Wu, and Xiaoning Jiang "High-temperature (> 1000 °C) acoustic emission sensor", Proc. SPIE 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, 869428 (16 April 2013); https://doi.org/10.1117/12.2009301

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