Electromagnetic acoustic transducer EMAT and inspection system w

Details Electromagnetic acoustic transducer EMAT and inspection system w Electromagnetic acoustic transducer EMAT and inspection system w

1996-12-12

1998-09-22

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73622, 73661, G01N 2924

Patent

active

058116826

ABSTRACT:
An electromagnetic acoustic transducer for magnets and a sheet type coil unit. The magnets are permanent magnets or electromagnets to provide a static magnetic field to an object to be inspected. The coil unit includes a pair of spiral or meander coils of an electrically conductive material, sandwiched between upper and middle insulation sheet and middle and lower insulation sheet. The coils are used for transmission and reception, respectively. All the ends of the respective coils extend through throughholes formed through the upper and middle insulation sheets to the surface of the ultrasonic transducer, and are connected to external leads. The ends for earth are commonly connected to form a common ground terminal. The inspection system with the electromagnetic acoustic resonance which is a combination of resonant technique and a non-contact electromagnetic acoustic transducer can evaluates the absolute value of ultrasonic attenuation. The attenuation is highly sensitive to the accumulated fatigue damage, showing a maximum around 20-30% of the whole life. This system can assess damage and predict the fatigue life of metals.

REFERENCES:
patent: 4434663 (1984-03-01), Peterson et al.
patent: 4452086 (1984-06-01), Huschelrath et al.
patent: 4593567 (1986-06-01), Isselstein et al.
patent: 4777824 (1988-10-01), Alers et al.
patent: 5503020 (1996-04-01), Mandracchia
patent: 5608164 (1997-03-01), MacLauchlan
patent: 5608691 (1997-03-01), MacLaulan et al.

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