Krautkramer Branson, Inc.

Richard J Pittaro

Philip A Walker

Christopher C Dileo

Gary S Dallas

Patrick M O'Brien

A programmable ultrasonic thickness and acoustic velocity measuring instrument is provided which includes automatic zeroing (calibrating) means, automatic temperature compensation and high temperature warning means, automatic probe identification means, means for automatically correcting the measurement readings for probe characteristics, means for storing and displaying of the minimum wall thickness during a predetermined time interval, and means for providing a display indicative of the difference between a measured thickness and a preprogrammed value.

Ultrasonic thickness measuring instrument

A clock circuit comprising a synchronizable voltage controlled oscillator in combination with a programmable address means, which address means is adjusted commensurate with the acoustic velocity of the workpiece, provides clock pulses from the oscillator having a stable and accurate acoustic velocity dependent frequency. An entrant surface responsive electrical signal responsive to an ultrasonic search signal entering the workpiece is also provided to the clock circuit for assuring that the clock pulses are synchronized with the receipt of the electrical signal.

Clock circuit for use in pulse-echo ultrasonic defect testing

A pulse peak detector circuit for use in measuring the peak amplitude of a fast rise time, narrow pulse width pulse as in commonly encountered in an ultrasonic non-destructive testing instrument includes two amplifying means. A first amplifying means compensates small amplitude signals for the characteristics of a unidirectional current conducting means forming a part of the detector circuit while the second amplifying means provides conventional amplification of the applied signal.

Pulse peak detector circuit

Ultrasonic inspection device

An electrical circuit incorporated in a receiver circuit of an ultrasonic pulse-echo thickness and/or velocity measuring apparatus causes the entrant surface and rear wall responsive video signals to be of equal magnitude and in phase with each other. The provision of echo responsive video signals having equal amplitude and phase results in a measuring apparatus exhibiting improved accuracy while requiring fewer and less expensive circuit components.

Ultrasonic pulse-echo thickness measuring apparatus

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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Stamford, CT, United States of America

Richard J Pittaro