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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >High-temperature acoustic emission sensing tests using a Yttrium calcium oxyborate sensor
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High-temperature acoustic emission sensing tests using a Yttrium calcium oxyborate sensor

机译：使用氧硼酸钇钙传感器进行高温声发射感测测试

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摘要

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 0;C to 700 0;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 0;C) applications. The sensitivity of the YCOB sensor was found to have minimal degradation with increasing temperature up to 1000 0;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 0;C. The frequency characteristics of the signal were verified using a finite-element model and wavelet transformation analysis.
机译：压电材料已广泛用于声发射传感器中，但通常在500 0; C至700 0; C范围内或更高温度下会因压电性能的丧失而受到阻碍。在本文中，使用氧硼酸钇钙（YCOB）单晶设计并制造了压电声发射传感器，随后进行了Hsu ?? Nielsen对高温（> 700 0; C）应用的测试。发现YCOB传感器的灵敏度随温度升高至1000 0; C而降级最小。在Hsu ?? Nielsen用钢筋进行的测试中，这种YCOB声传感器显示了分别检测30 kHz和120 kHz时的零阶对称和反对称模式的能力，并能够分辨出在240 kHz时的零阶对称模式和反对称模式。温度高达1000 0; C。使用有限元模型和小波变换分析验证了信号的频率特性。

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