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众所周知,固体的加载能够导致其结构的动力学移位,并能伴随弹性波的辐射。这种现象通常称为声发射。声发射的参数中含有关于弹性波源的信息。目前,声发射广泛地应用于物质断裂过程的研究和对各种物体状态的检查。在许多著作中论述了声发射参数与所产生裂缝尺寸的关系。在记录声发射时,作为弹性波接收器的有效元件,主要是采用高灵敏度的压电陶瓷。但是,当弹性波转变为电讯号时,由于压电陶瓷的
It is well known that the loading of solids can result in the dynamic displacement of their structure and can be accompanied by the radiation of elastic waves. This phenomenon is commonly referred to as acoustic emission. Acoustic emission parameters contain information about the elastic wave source. At present, acoustic emission is widely used in the study of material fracture process and the inspection of the status of various objects. The relationship between acoustic emission parameters and the size of the crack produced is discussed in many books. When recording acoustic emission, as the effective element of the elastic wave receiver, mainly high-sensitivity piezoelectric ceramics are used. However, when the elastic wave is converted into an electrical signal due to the piezoelectric ceramic