Structurally Integrated Thick Film Acoustic Emission Sensors

Pickwell, A. J.; Dorey, Robert A.

doi:10.1007/978-0-85729-493-7_57

Cited by 1 publication

(1 citation statement)

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“…after the aE sensor data obtained from Hsu-nielsen tests is processed in the time and frequency domains, a wavelet or spectrogram transform can be performed to relate the frequency components of the data with time [23]. The result of the wavelet transform is a contour plot, with the scale correlating to the magnitude of the frequency component at each sampled time step.…”

Section: Modal Analysismentioning

confidence: 99%

High-temperature acoustic emission sensing tests using a Yttrium calcium oxyborate sensor

Johnson

Kim

Zhang

et al. 2014

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Piezoelectric materials have been broadly utilized in acoustic emission sensors, but are often hindered by the loss of piezoelectric properties at temperatures in the 500°C to 700°C range or higher. In this paper, a piezoelectric acoustic emission sensor was designed and fabricated using yttrium calcium oxyborate (YCOB) single crystals, followed by Hsu-Nielsen tests for high-temperature (>700°C) applications. The sensitivity of the YCOB sensor was found to have minimal degradation with increasing temperature up to 1000°C. During Hsu-Nielsen tests with a steel bar, this YCOB acoustic sensor showed the ability to detect zero-order symmetric and antisymmetric modes at 30 and 120 kHz, respectively, as well as distinguish a first-order antisymmetric mode at 240 kHz at elevated temperatures up to 1000°C. The frequency characteristics of the signal were verified using a finite-element model and wavelet transformation analysis.

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Section: Modal Analysismentioning

confidence: 99%