Measuring and testing – Vibration – By mechanical waves
Patent
1980-08-21
1982-09-14
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
G01N 2900
Patent
active
043489036
ABSTRACT:
First and second magnetic poles are provided, which have end surfaces brought close and in opposition to a material to be examined. These magnetic poles are magnetized by a DC exciter coil such that the magnetic poles have opposite polarities. The first magnetic pole is provided at its end surface with a pair of cumulatively connected transmitting coils, and the second magnetic pole is provided at its end surface with a pair of differentially connected receiving coils. The transmitting coils are connected to a pulser which generates a pulse current, and the receiving coils are connected to a differential amplifier. An electromagnetic ultrasonic wave generated by the transmitting coils are received by the receiving coils, amplified by the differential amplifier, and thereafter supplied to a synchroscope and an automatic detector.
REFERENCES:
patent: 4164873 (1979-08-01), Bottcher et al.
G. J. Parkinson et al., "Non-Contact Ultrasonics", British Journal of NDT, pp. 178-184, Jul. 1977.
Itoh Susumu
Kawamura Koji
Kubota Jun
Miyagawa Kazuo
Sasaki Soji
Hitachi , Ltd.
Kreitman Stephen A.
Nippon Steel Corporation
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