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伴随固体材料中微小破裂的扩展,固体会以声波的形式释放应变能,此种现象称为声发射(Acoustic Emission),把检测这种声波的敏感器称为声发射敏感器(AE敏感器).在此次研制的敏感器中,常温用的PZT三元系压电陶瓷敏感器,而高温用的(常用300℃)是钛酸铅系压电陶瓷敏感器.在压电材料常数和敏感元件与尺寸的关系中,从理论上分析了声发射敏感器的最重要的特性,即灵敏度-频率特性,其准确性是通过利用作为AE模的脉冲声波来证实的.此外,利用互易校正法决定其绝对灵敏度.
Accompanying the propagation of micro-cracks in solid materials, solids release strain energy in the form of acoustic waves, a phenomenon known as acoustic emission. A sensor that detects this acoustic wave is called an acoustic emission sensor (AE sensor) In the developed sensor, the PZT ternary piezoelectric ceramic sensor is used at room temperature, and the lead titanate piezoelectric ceramic sensor used at high temperature (300 ℃ commonly used) is piezoelectric constant and sensitive The relationship between components and dimensions theoretically analyzes the most important characteristic of the acoustic emission sensor, namely the sensitivity-frequency characteristic, whose accuracy is confirmed by the use of a pulsed sound wave as an AE mode.Furthermore, Law determines its absolute sensitivity.