Remote preamplifier and impedance matching circuit for electromagnetic acoustic transducer
US5511424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Feb 15, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B2201/58
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A preamplification and impedance matching circuit for an electromagnetic acoustic transducer includes an impedance matching section of the circuit having input terminals for receiving radio frequency power from a radio frequency power source. A matching transformer, which is a step-down transformer, is operatively connected to the input terminals. Diode networks are operatively connected to the matching transformer and output terminals which lead to the coil of the transducer. Signal responses emitted by the transducer coil are transmitted to a preamplifier section of the circuit. Choke coils or resistors are used to limit radio frequency power entry into the preamplifier section of the circuit. The preamplifier section has a preamplifier which is operatively connected to a first transformer and a second transformer such that the transformer are located on opposite sides of the preamplifier for increasing the amplitude of the coil signal response prior to transmission to detectors located in the instrumentation of the transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.