Krautkramer Branson, Inc.

Klaus Kroesen

Peter Renzel

The invention relates to an ultrasonic test instrument, in which a receiver amplifier is controlled in dependence upon time by means of a depth compensation signal or else the ultrasonic signal amplified independently of the depth is evaluated by means of a time-dependent variable threshold signal. The depth compensation signals and the time-dependent threshold signals are derived from the same digital signal values stored in a main memory. The test instrument comprises a microprocessor by means of which the digital signal values for each material requiring testing are automatically measured by the instrument itself in conjunction with whichever test probe is used provided a corresponding test block of this material is available. The microprocessor also controls the circuit generating the depth compensation and threshold signals, so that depending upon the type of operation selected the cathode ray tube can display either the ultrasonic echo responsive signals corrected as a function of depth or the uncorrected ultrasonic signals are shown together with the time-dependent threshold value.

Ultrasonic test instrument with controllable amplifier

A method and apparatus for determining by the pulse-echo method the acoustic velocity of a workpiece of known thickness utilize measurement of the transit time of the first rear wall echo signal and that of the second rear wall echo signal. The two transit times are then processed in a microprocessor which also controls the entire measuring cycle. For accurate measurement the transit time is defined as the time interval from the leading edge of the trigger pulse, which triggers the transmit pulse generator, to the time at which the respective echo signal exceeds a preset threshold amplitude.

Method and apparatus for determining the acoustic velocity of a workpiece

Display of the results of non-destructive testing with a beam of ultrasonic energy is enhanced by exercising precise control over the horizontal sweep voltage which is applied to the deflection plates of a cathode ray tube on which the test information is displayed. The sweep voltage generator produces a sawtooth waveform which has a precisely selectable slope. The sawtooth voltage waveform slope may be adjusted by selecting the capacitance, which is charged from an adjustable constant current source, and by varying the charging current. A microprocessor, which stores information commensurate with various waveform slopes, will control the adjustment of the sawtooth waveform slope by comparison of the stored information with keyboard entered data corresponding to a desired slope.

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Bonn, Germany

Klaus Kroesen