The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1982
Filed:
Aug. 21, 1980
Ichiya Sato, Hitachi, JP;
Kazuo Miyagawa, Kisarazu, JP;
Yukito Sasaki, Kisarazu, JP;
Koji Kawamura, Kimitsu, JP;
Shuichi Sato, Kimitsu, JP;
Soji Sasaki, Hitachi, JP;
Jun Kubota, Hitachi, JP;
Susumu Itoh, Hitachi, JP;
Nippon Steel Corporation, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
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.