Measuring and testing – Vibration – By mechanical waves
Patent
1983-01-20
1984-12-25
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73641, G01N 2904
Patent
active
044896115
ABSTRACT:
Materials and structural components having irregular shapes may be tested two ultrasonic testing heads which are movable in unison in the direction in which the cross-section of the material or component being tested changes. The synchroneously moving testing heads are spaced from each other in a direction extending across the moving direction. The testing heads are ultrasonic receivers connected with their outputs to a comparing device which provides an error signal when the amplitude ratio of the received signal changes. The amplitude ratio is formed between the amplitudes of the ultrasonic signals received by both testing heads. Preferably, the comparing device comprises an amplifier which amplifies the amplitude of the received second signal by an amplification factor which is proportional to a deviation of the amplitude of the received first signal from a reference value. The error signal is recorded, for example, by a coordinate plotter.
REFERENCES:
patent: 3147613 (1964-09-01), Kirkhope
patent: 3978714 (1976-09-01), Shraiber
patent: 4052888 (1977-10-01), Brown
patent: 4143553 (1979-04-01), Martens
patent: 4305297 (1981-12-01), Ries
Langer Helmar
Zimmermann Werner
Fasse W. G.
Kane, Jr. D. H.
Kovalick Vincent P.
Kreitman Stephen A.
Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftu
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