Measuring and testing – Vibration – By mechanical waves
Patent
1978-01-13
1979-01-16
Myracle, Jerry W.
Measuring and testing
Vibration
By mechanical waves
73642, 328 63, G01N 2904
Patent
active
041343026
ABSTRACT:
A pulser circuit for providing electrical exciting pulses to a transducer in an ultrasonic testing apparatus in which a transducer transmits ultrasonic energy corresponding to the pulses into a test specimen. The pulser circuit includes a capacitor connected in series with a source of charging potential and a load impedance. A pair of switching transistors are connected in parallel and to the capacitor and the charging potential. A second switching transistor is connected directly across the capacitor. The first switching transistors turn on and cause the charged capacitor to develop the leading edge of a pulse across the load impedance. The leading edge turns on the second switching transistor which provides a direct discharge path for the capacitor and thereby shapes the pulse. Diode means is connected across the load impedance to assist in rapid recharging of the capacitor. The diode means is forward biased to provide a clamped reference potential for the pulse.
REFERENCES:
patent: 3167717 (1965-01-01), Jones et al.
patent: 3982425 (1976-09-01), McLain
Myracle Jerry W.
TRW Inc.
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