Measuring and testing – Vibration – By mechanical waves
Patent
1997-09-29
2000-08-29
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
73600, 73643, G01N 2920
Patent
active
061091081
ABSTRACT:
An electromagnetic acoustic transducer is provided which includes 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 accomplish evaluating 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 the damage advance and predict the remaining life of metals.
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Hirao Masahiko
Ogi Hirotsugu
Ohtani Toshihiro
Ebara Corporation
Fayyaz Nashmiya S.
Williams Hezron
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