SU920511A1 - Ultrasonic device for material quality control - Google Patents

Description

I

The invention relates to non-destructive ultrasonic testing and can be used to control the quality of products in the metallurgical, engineering and other industries.

An ultrasonic device for quality control of products is known, which contains a pulse generator, emitting and receiving transducers, a selector and a dividing unit. A disadvantage of the known device is low accuracy, caused by the dependence of the signal amplitude on changes in the monitored parameter.

The closest to the invention in technical essence and the achieved result is an ultrasonic device for controlling the quality of materials, containing a series-connected probe pulse generator, a transducer.

selector, first measuring unit and recorder, as well as the first | the delay unit, the output of which is connected to the second input of the first time of the measuring unit 21.

The disadvantage of this device is the low control accuracy, since it does not take into account the error caused by the non-thickness of the product.

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The purpose of the invention is to improve the accuracy of control.

This goal is achieved by the fact that an ultrasound device for controlling the quality of materials, containing 15 series-connected probe pulse generator, transducer, selector, first time measuring unit and recorder, as well as the first delay unit,

Claims (2)

20 whose output is connected to the second input of the first time of the measuring block., Is provided with a separate combined searcher connected in series by an amplifier whose input is connected to the receiver of the finder, a second time measuring unit and a dividing unit connected between the recorder and the first time measuring unit and the second unit delay connected between the probe pulse generator and the second time measuring unit, and the output of the probe pulse generator is connected to the input of the emitting pulse eobrazovatel seekers. The drawing shows a block diagram of the proposed device. The device contains a series of connected probe pulse generator 1, a transducer 2, a first time selector, a measuring unit k and a recorder 5, as well as a first delay unit 6, the output of which is connected to the second input of the first time measuring unit k, and a separately-connected finder 7 prisms 8 and which are installed radiating transducer 10 and the receiving transducer t1. In addition, the device contains a serially connected amplifier 12, whose input is connected to the receiving converter 11 of the searcher 7 by the second frame of the measuring unit 13 and the dividing unit k connected between the recorder 5 and the first time by the measuring unit k, and the second delay unit 15 connected between the generator 1 probe pulses and the second time measuring unit 13. The output of the generator 1 probe pulses are connected to the input of the radiating precursor 10 of the searcher 7. The device operates as follows. The probe pulse generator 1 excites in the product by means of the transducer 2 ultrasonic vibrations, which are received from the opposite side of the product by the same transducer. 2. Next, the pulses reflected from the product are selected by a selector 3 and arrive at the time of the measuring unit for measurement. The second input time of the measuring unit receives pulses from the output of block 6 of the delay. The probe pulse generator 1 also excites from the radiating transducer 10, emits oscillations in the searcher 7 with the propagation speed C. When passing into the controlled product, the pulse refracts and propagates in it as a longitudinal wave with the propagation velocity C. Angles of refraction are counted relative to the normal to the surface of the controlled product, have the value of arc sin (tt-sin in-). The refracted impulse, having reached the opposite surface of the product, is reflected at an angle relative to the normal to this surface, equal to the angle of refraction О-- On the surface, the reflected impulse experiences refraction at an angle of% in prism 8, propagating in it at a speed Cd in the form of a pulsed longitudinal wave. the receiving transducer 11. At the same distance AND centers of the transducers 10 and 11 from the surface of the product, separated from each other by the distance L, the total pulse propagation time t is the value t2 POP – T - tg ,, 2 H cos Cd C / i / siBS-, product thickness. The pulse from the output of the receiving Converter 11 is fed to the input time of the measuring unit 13, the second input of which receives a pulse from the output of the block 15 of the delay. The output pulses of the signals of blocks 4 and 13 are proportional to the values and enter the division block 14, where the ratio tl-ts / ti is determined. The measured ratio equal to CDS (1-7,) does not depend on 1/4 sieves on changes in the thickness d of the product. Its value depends on the speed of ultrasound and judging by its value on the quality of the controlled product. The proposed device allows to increase the control accuracy, since the results are not affected by the change in the thickness of the products. Ultrasonic device for quality control of materials with