US 5526691 A
 

　　A method for detecting corrosion fatigue cracks in membraned boiler tubes in a membrane tube panel employs at least one EMAT coil generating ultrasonic SH shear waves at a predetermined beam angle. The method of the present invention provides better signal-to-noise ratios than conventional ultrasonic techniques as well as not requiring any couplant.

 

　　一种检测方法，检测膜锅炉管疲劳裂纹腐蚀。采用至少一个EMAT线圈产生在预定的光束角超声波剪切波SH.相比于传统的超声波技术，本发明的方法提供了更好的信噪比，并且不要求任何耦合剂。

责任编辑：郭静

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