Title :
Arrayed-coil EMAT for longitudinal wave in steel wires
Author :
Yamasaki, Tomohiro ; Tamai, Shingo ; Hirao, Masahiko
Author_Institution :
Graduate Sch. of Eng. Sci., Osaka Univ., Japan
Abstract :
Two types of electromagnetic acoustic transducers (EMATs) with arrayed coils are developed for longitudinal wave in steel wires. One amplifies the signal by overlapping the pulses from all coils in phase. The other cancels one of two directional waves, propagated symmetrically in the wire, by overlapping two antiphase waves. Combination of these two types of the EMATs enables us to launch the longitudinal wave of sufficient amplitude in one direction, which can be used in long-ranged flaw detection in steel wires
Keywords :
coils; flaw detection; steel; ultrasonic materials testing; ultrasonic transducers; amplitude; antiphase waves; arrayed coil electromagnetic acoustic transducers; directional waves; long-ranged flaw detection; longitudinal wave; overlapping; signal; steel wires; Acoustic arrays; Acoustic propagation; Acoustic pulses; Acoustic transducers; Coils; Electromagnetic propagation; Electromagnetic scattering; Pulse amplifiers; Steel; Wires;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762265
