Krautkramer Branson, Inc.

Christopher C Dileo

Richard J Pittaro

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.

Attenuator circuit ultrasonic testing

The invention refers to an ultrasonic measuring means exhibiting improved stability and calibration adaptability. Ultrasonic energy signals are transmitted into a workpiece and echo responsive signals are received therefrom. A timing signal having a pulse width commensurate with the workpiece thickness is generated. The pulse width is measured by a time interval averaging circuit in combination with a programmable counting means for adjusting the quantity of time interval average measurements required for determining the thickness of the workpiece. The programmable means is adjusted to a value commensurate with the acoustic velocity of the workpiece for causing the output of the apparatus to display the dimension of the workpiece measured.

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Brewster, NY, United States of America

Christopher C Dileo