Title: Attenuator circuit ultrasonic testing

Abstract: A broad bandwidth, constant input impedance programmable attenuator circuit for use in pulse-echo ultrasonic testing is provided for attenuating an acoustic discontinuity responsive electrical signal. The attenuator circuit is programmable either by computer or manually and comprises solid state components, specifically a constant current source and unidirectional current conducting devices. The attenuator circuit exhibits both constant input impedance over a wide range of operating frequencies and immunity from varying output load conditions.

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Inventors: DiLeo, Christopher C. (Brewster, NY, US)

Application Number: 708556
Filing Date: 1976-07-26
Publication_date: 1977-09-20
Assignee: Krautkramer-Branson, Incorporated (Stratford, CT)
Primary Class(es): 367/87 73/599, 367/13
Other Classes:
US Patent Ref:

3553636	Jan, 1971	Baird	340/1.
3738159	Jun, 1973	Donnadieu	73/67.

Other Refs:
Primary Examiner: Farley, Richard A.
Assistant Examiner:
Attorney: Steinberg; Ervin B., Feig; Philip J.