Measuring and testing – Vibration – By mechanical waves
Patent
1982-06-09
1984-05-29
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
G01N 2900, G01N 2904
Patent
active
044507259
ABSTRACT:
An electromagnetic-acoustic measuring apparatus is disclosed in which an exciting coil is wound around a body to be inspected in order to generate a magnetic field within the body in the direction parallel to a surface of the body, a transmitting coil is used to generate mechanical strain in the surface of the body by utilizing the magnetic field, a receiving coil detects the mechanical strain at the surface of the body after the mechanical strain has been propagated in the body, the exciting coil is enclosed with a separable core, the transmitting and receiving coils are supported by respective head portions of pole pieces fixed to the core, and the transmitting and receiving coils and pole pieces are water-cooled by means of cooling pipes.
REFERENCES:
patent: 3697867 (1972-10-01), Kleesattel
patent: 4034841 (1977-01-01), Ohyama
patent: 4184374 (1980-01-01), Thompson et al.
patent: 4309905 (1982-01-01), Maizenberg
patent: 4348903 (1982-09-01), Sato et al.
"Electromagneto-Acoustic Non-Destructive Testing in the Soviet Union," Butenko et al, Non-Destructive Testing, vol. 5, No. 3, Jun. 1972, pp. 154-159.
Fujisawa Kazuo
Itoh Susumu
Kadowaki Takashi
Sasaki Soji
Sato Ichiya
Birmiel Howard A.
Hitachi , Ltd.
Sumitomo Metal Industries Ltd.
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