Title :
A method for nondestructive evaluation of crack depth on metal surface by microwaves
Author :
Saka, M. ; Yang Ju ; Daying Luo ; Abe, H.
Author_Institution :
Dept. of Mech. Eng., Tohoku Univ., Sendai, Japan
Abstract :
A microwave method to evaluate the depth of cracks on the metal surface is demonstrated. An open-ended coaxial line sensor was developed to improve the spatial resolution for detection of small 3D cracks. The amplitude of the reflection coefficient that is associated with the dimensions of the cracks is measured by scanning the specimen in the direction perpendicular to the detected crack. A characteristic signal corresponding to the detected crack was obtained and was used to evaluate the depth of cracks.
Keywords :
crack detection; microwave reflectometry; characteristic signal; crack depth; crack dimensions; metal surface; microwave NDT; microwave method; nondestructive evaluation; open-ended coaxial line sensor; reflection coefficient amplitude; small 3D cracks; spatial resolution; Apertures; Coaxial components; Cutoff frequency; Electromagnetic waveguides; Mechanical engineering; Mechanical sensors; Microwave theory and techniques; Reflection; Spatial resolution; Surface cracks;
Conference_Titel :
Infrared and Millimeter Waves, 2000. Conference Digest. 2000 25th International Conference on
Conference_Location :
Beijing, China
Print_ISBN :
0-7803-6513-5
DOI :
10.1109/ICIMW.2000.893090
