Electromagnetic ultrasonic apparatus
US4348903A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 21, 1980 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Aug 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0421
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.