SU920510A1 - Ultrasonic device for material quality control - Google Patents

Description

I

The invention relates to non-destructive methods of quality control of materials and can be used; but for quality control of materials.

An ultrasonic device for controlling the quality of materials is known, comprising a generator, an amplifier, a radiation transmitter and a peak detector 1.

A disadvantage of the known device is low control accuracy, since it does not take into account the change in the thickness of the product. Closest to the invention, the technical essence and the achieved result is an ultrasonic device for controlling the quality of materials, containing a probe pulse generator, the main acoustic channel consisting of and receiving transducers, the first time is a measuring unit, a unit which input is connected

To receiving transducer, and recorder 2.

The disadvantage of this device is also low control accuracy, since it does not take into account the change in the thickness of the product to the control results.

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

The goal is achieved by

10 that the ultrasonic device for quality control of materials is equipped with two additional acoustic channels having a base identical to the main channel and consisting

J5 from the emitting and receiving transducers, the second time measuring unit, the inputs of which are connected to the receiving transducers of additional channels and the input of the first

20 by the shaft of the measuring unit, and by the ratio unit, connected between the time of the measuring units and connected to the recorder's output, and the output of the probe pulse generator is connected to the inputs of the radiating transducers of the additional channels. The drawing shows a block diagram of the proposed device. Ultra. An audio device for controlling the quality of materials contains a series-connected generator 1 of sounding pulses, a radiating transducer 2, and a receiving transducer 3 of the main acoustic channel, the first time measuring unit k, whose input is connected to. The transducer 3 and the recorder 5. In addition, the device contains two additional acoustic channels b, and 7 having a base identical to the main channel. The first additional acoustic channel 6 contains the radiating transducer 8 and the receiving transducer 9. The second additional acoustic channel 7 contains the emitting transducer 10 and the receiving transducer 11. The device also contains a second time measuring unit 12, the inputs of which are connected to the receiving transducers 9 and 11 , the first time measuring unit and the ratio unit 13 connected between the units L and 12 and connected to the output of the recorder 5. The output of the probe pulse generator 1 is connected to the inputs of the radiating converters) 8 and 10 additional channels. The device works as follows. The probe pulse generator 1 excites a radiating transducer 2, which radiates ultrasound vibrations through the immersion medium into the product at a speed C at an angle b relative to the normal to the surface of product 1. On the surface of the product, these vibrations are refracted and transformed into a longitudinal wave. into a product with a speed C at an angle 0 equal to arcsin (7 sin 8) - t On the opposite surface of product 1, this wave refracts again, transforming into a wave that propagates in immersion media. e with speed C at an angle b | The relative normals to this surface are taken by the receiving transducer | Lem 3. The total propagation time tf of the ultrasound wave from transducer 2 to transducer 3, whose planes are spaced from each other at a distance H, is determined by the expression. dco4 4. H-dcob9 At the same time, the generator of 1 probe pulses excites the radiating transducer 8, which emits ultrasonic vibrations into the immersion medium. The receiving transducer 9 receives these oscillations that have passed through the product 1. The total propagation time between these transducers is tz l -V, where d is the thickness of the product. In addition, the probe pulse generator excites the radiating transducer 10, which emits ultrasonic oscillations into the immersion medium at a rate of C. The propagation time between transducers and applicants. The shifts 1 c and L b are measured in blocks 4 and 12, and their ratio in block 13-Ratio is a function of the speed C of ultrasound and is determined by the formula lX ±, - C06e - i COA9 i, respectively, the function of the material's monitored property. Thus, the proposed image allows improving ontrol accuracy due to the fact that the readings of the recorder do not depend on changes in the thickness of the product. The invention of the ultrasound device for the ontrol quality of materials, containing the generator of probe pulses, the main acoustic channel, which is FROM the emitting and receiving transducers, is the first time measuring unit, whose input is under

Claims (1)

Claim An ultrasonic device for controlling the quality of materials, containing a probe pulse generator 55, the main acoustic channel, consisting of a radiating and receiving transducers, the first time-measuring unit, the input of which is connected to the receiving transducer, · and a recorder, which means that to increase the accuracy of control, it is equipped with two additional acoustic channels, having a base identical to the main channel, and consisting of emitting and receiving transducers, measure the second nym unit whose inputs are connected to the receiving transducer and additional channels vremyaizmeritolnogo input of the first block, and the block ratio included between vremya9205Yu measuring units and connected to the output recorder, and the output gene Rhatore sounding pulse inputs connected to the radiating preob0azova 5. additional channels.