以凯瑟效应测量岩石试样先存应力，声发射探头与试样的耦合是其重要环节。

Coupling the acoustic emission probe with the specimen is the key link in the measurement of preexisting stress of the rock specimen by Kaiser effect.

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同时，通过改进探头的结构，减小探头的入射角度，提高系统的耦合性能。

In the mean time, the structure of the probe is improved and the incident Angle of the probe is reduced to improve coupling performance of the system.

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该装置采用全油浸耦合，用聚束探头检测近表面缺陷，用表面波检测表面裂纹，用计算机化c扫描定量缺陷尺寸。

By oil immersion coupling. the system can be used to detect near surface defects with focussing probe. find surface cracks with surface wave probe and determine defect size with computerized C-scan.

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