Measuring and testing – Vibration – By mechanical waves
Patent
1978-07-06
1980-02-12
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
041877250
ABSTRACT:
According to the proposed method for ultrasonic inspection of materials, a eception and processing of ultrasonic vibrations reflected from a material being tested are followed by separating signals from noise at a preset level, which is carried out by means of time selection of signals performed within time intervals during which the signals' amplitudes exceed the preset level. In the device for effecting the method of this invention, an output of an ultrasonic generator, whose input is connected to one of the outputs of a synchronizer, is connected to an input of an ultrasonic converter acoustically coupled to the material being tested. An output of the ultrasonic converter is connected to an input of a reflected ultrasonic vibrations preprocessing unit whose output is electrically coupled to one of inputs of a signals recording unit. The coupling is effected either via a high-frequency amplifier, a no-noise-cutoff detector and a unit for separating signals from noise at a preset level, which are placed in series, or via the unit for separating signals from noise at a preset level, the high-frequency amplifier and the no-noise-cutoff detector placed in series. The unit for separating signals from noise at a preset level contains a gate pulse forming circuit and an AND circuit whose first input is electrically coupled to an input of the gate pulse forming circuit, the latter's output being connected to a second input of the AND circuit.
REFERENCES:
patent: 3690156 (1972-09-01), Robinson
patent: 3733891 (1973-05-01), Weighart
Birjukov Sergei B.
Gavrev Valery S.
Goncharuk Jury M.
Popova Ljudmila A.
Savitsky Alexandr V.
Kreitman Stephen A.
Vsesojuzny Nauchno-Issledovatelsky Institut Po Razrabotke
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