Title :
Wideband electromagnetic acoustic transducers utilising neodymium iron boron permanent magnets
Author :
Edwards, C. ; Palmer, S.B.
Author_Institution :
Dept. of Phys., Warwick Univ., Coventry, UK
fDate :
9/1/1990 12:00:00 AM
Abstract :
The fabrication of electromagnetic acoustic transducers (EMATs) is described. It is shown that neodymium-iron-boron permanent magnets allow compact devices to be constructed. Pickup mechanisms in both magnetic and nonmagnetic metals are discussed and demonstrated experimentally. It is concluded that EMATs are suitable detectors for broadband laser generated ultrasound. Such systems, being noncontacting, can operate at high temperature
Keywords :
acoustoelectric transducers; boron alloys; iron alloys; neodymium alloys; permanent magnets; ultrasonic materials testing; ultrasonic transducers; EMAT; NdFeB permanent magnets; broadband laser generated ultrasound; compact devices; wideband electromagnetic acoustic transducers pickup mechanism; Acoustic transducers; Boron; Iron; Magnetostriction; Neodymium; Optical pulse generation; Permanent magnets; Plasma sources; Steel; Wideband;
Journal_Title :
Magnetics, IEEE Transactions on
