摘要:

The various methods for non-contact ultrasonic inspection are reviewed. Electromagnetic, electrostatic and optical systems are described with comments on their application to testing situations outside the laboratory.

ISSN:0278-0895    

DOI:10.1080/10589758308952888

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Synthetic aperture processing performed on linear scans with contact ultrasonic transducers can yield useful improvements in lateral resolution of deeply buried defects. Degradation in resolution caused by adverse surface conditions can be minimised by a simple pre-processing normalisation technique.

ISSN:0278-0895    

DOI:10.1080/10589758308952889

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An application involving the use of Fourier descriptors for characterizing eddy current impedance plane trajectories is described. The amplitude coefficients in the Fourier descriptors are incorporated into a feature vector along with the ‘phase angle” of the trajectory. Defect classification is obtained by clustering the feature vectors in the multidimensional feature space using theK-Means algorithm. Advantages of the method include the insensitivity of the method to drift in the gain and zero settings of the measuring eddy current instrument and also fluctuations in the probe speed. In addition the curve can be reconstructed using the descriptors. Experimental evidence showing that the method can be successfully used for identifying defect signatures is presented.

ISSN:0278-0895    

DOI:10.1080/10589758308952890

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0278-0895    

DOI:10.1080/10589758308952891

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor