Remote tone burst electromagnetic acoustic transducer pulser

Details Remote tone burst electromagnetic acoustic transducer pulser Remote tone burst electromagnetic acoustic transducer pulser

1994-02-15

1995-06-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327108, 327181, H03K 100, H03K 357

Patent

active

054263883

ABSTRACT:
A remote tone burst pulser for an electromagnetic acoustic transducer utilizes a circuit having a direct current power source which is provided to a main capacitor. A high power, high speed insulated gate bipolar transistor or metal oxide-semiconductor controlled thyristor is operatively connected to the main capacitor and the coil of the transducer. A drive circuit is operatively connected to this device for transmitting a train of switch pulses which causes radio frequency alternating current to be provided to the transducer coil. A power transistor is operatively connected to the first transistor and is activated by a second drive circuit for causing a conducting state which allows for the power being applied to the transducer coil to be rapidly dissipated by a resistor and the internal resistance of the power transistor.

REFERENCES:
patent: 3916373 (1975-10-01), Schroder
patent: 5095224 (1992-03-01), Renger

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