SU1190254A1 - Method of material ultrasonic quality inspection and apparatus for accomplishment of same - Google Patents

Abstract

.one. The method of ultrasonic quality control of materials, which consists in emitting elastic oscillations in the form of a binary pseudo-random code sequence into a product, accepts: the oscillations passing through the product, compare the characteristics of the emitted and received oscillations and determine the quality of the product according to that, in order to increase the reliability of the control, the elastic oscillations emit in the form of a packet of a phase-shifted and pseudo-random code sequence.

Description

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2. A device for ultrasound quality control of materials, containing a pseudo-random code sequence generator, an analog key, a serially connected piezotransducer, and a first amplifier and time meter, which is equipped with series-connected sinusoidal oscillations and a driver of direct coal pulses, an output connected to the generator input of a pseudo-random code sequence, a circuit for forming a period of a sequence, an input chennoy to first output a pseudorandom code sequence generator, and the output - to the first input

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an analog key, a balance modulator, the first input connected to the second code of the sinusoidal oscillator, the second input to the second output of the pseudo-random code generator, and the output to the second input of the analog key, power amplifier turned on between the analog key and piezoelectric transducer, and sequentially connected by a demodulator, the first input connected to the output of the first amplifier, and the second input to the second output of the generator of sinusoidal oscillations, the second amplifier, ltrom low frequencies. limiting amplifier and optimal filter, output connected to the time meter.

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The invention relates to non-destructive ultrasonic testing and can be used in the engineering and other industries.

The aim of the invention is to increase the reliability of quality control of materials by increasing the noise immunity of the control.

The drawing shows a block diagram of an ultrasound device for quality control of materials.

The device contains sequentially connected sinusoidal oscillator 1, form JJt 2 rectangular pulses, generator 3 of a pseudo-random code sequence, sequence period formation circuit 4, analog switch 5, power amplifier 6, piezo transducer 7, first; amplifier 8, demodulator 9, second input connected to the second output of sinusoidal oscillator 1, second amplifier 10, low pass filter 11, amplifier limiter 12, optimal filter 13 and time meter 14, balanced modulator 15, first input connected to second output 3 generator of pseudo-random code, sequence, second input to the second output of the generator 1 sinusoidal oscillations, and output to the second input of the analog switch 5.

The method is carried out as follows.

From oscillations of the sinusoidal generator 1, rectangular pulses are formed by the driver 2, which are fed to the generator 3 of a pseudo-random code sequence. From a continuous code sequence, a sequence sequence is created by a sequence period shaping circuit 4, which determines the transmission period of key 5. Sine-wave oscillations from generator 1 are fed to a balanced modulator 15, where they are modulated by a pseudo-random code sequence from generator 3 and fed to the input of an analog key 5, the output of which is fed to the power amplifier 6 and then to the piezoelectric transducer 7 and the control object. The oscillations that pass through the control object are received by bezopreob

Claims (2)

,one. The method of ultrasonic quality control of materials, which consists in the fact that elastic vibrations in the form of a binary pseudo-random code sequence are emitted into the product, vibrations that have grown through the product are received, the characteristics of the emitted and received vibrations are compared, and the quality of the product is determined by the time of oscillation, characterized in that, in order to increase the reliability of control, elastic vibrations emit in the form of a packet of phase-manipulated and pseudo-random code sequences. 2. Device for ultrasonic quality control of materials containing a pseudo-random code sequence generator, an analog key, a piezoelectric transducer and a first amplifier and a time meter connected in series, characterized in that it is equipped with a sinusoidal oscillation generator and a rectangular pulse shaper connected in series with an output connected to the input of the pseudorandom generator a code sequence, a sequence period generating circuit, an input connected to the first output of the pseudo-random code sequence generator, and the output to the first input of the analog key, the balance modulator, the first input connected to the second output of the sine wave generator, the second input to the second output of the pseudo-random code generator, and the output to the second input of the analog key, a power amplifier connected between the analog switch and the piezoelectric transducer, and a series-connected demodulator, the first input connected to the output of the first amplifier sprucing, and the second input to the second output of the sinusoidal oscillator, the second amplifier, low-pass filter,. limiting amplifier and optimal filter output connected to a time meter.