Focal type electromagnetic acoustic transducer and flaw detectio

Details Focal type electromagnetic acoustic transducer and flaw detectio Focal type electromagnetic acoustic transducer and flaw detectio

1998-03-20

2000-03-21

Williams, Hezron

Measuring and testing

Vibration

By mechanical waves

73598, 73600, G01N 924

Patent

active

060389257

ABSTRACT:
A focusing electromagnetic acoustic transducer is provided which comprises a pair of meander coils, three insulation sheets and a magnet. The meander coils are formed on both surfaces of one of the insulation sheets to be positioned such that the meander coils are coincident with each other, and they are covered with the other insulation sheets. Each of the meander coils comprises a plurality of coil segments wherein intervals between adjacent coil segments sequentially are varied from one end to the other end. The magnet is positioned above the layers consisting the meander coils and insulation sheets. The coil segments of each meander coil are straight lines in parallel with each others, sector shapes on respective circulars having the same center point, or generally circular shapes having the same center point.

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patent: 5608691 (1997-03-01), MacLauchlan et al.
patent: 5760307 (1998-06-01), Latimer et al.
patent: 5808202 (1998-09-01), Passarelli, Jr.

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