Automated impact-echo and method improvement

Development of a magetnetostrictive transducer for nondestructive testing of concrete structures

“…The giant magnetostrictive Tb 0.3 Dy 0.7 Fe 2 material was chosen as the active element for the present purpose. [11][12][13] However, in this method, extremely low frequencies ͑1-20 kHz͒, where attenuation is less pronounced, are employed and these make this method more acceptable for testing concrete structures for gross defects such as delaminations and wall thinning. The performance of the transducer was validated by carrying out NDT on a test concrete block with delaminated regions, using the ultrasonic through-transmission technique and the pitch-catch method.…”