SU1670581A1 - Apparatus for testing physicomechanical characteristics of material surfaces - Google Patents

Abstract

This invention relates to non-destructive testing. The aim of the invention is to expand the scope of use by allowing control of curved surfaces. The transducer 8 excites in a controlled sample 10 a surface acoustic wave, which is received by the transducer 9, and the parameters of the received signal are measured by which the surface quality is judged. Due to the fact that the transducers are made of elastic piezoelectric material in the form of interdigital two-terminal networks and are mounted on brackets 2 and 3 fixed with the possibility of axial and transverse movements and rotation relative to the attachment point, a stable uniform acoustic area is established between the transducers and the surface of the material under test. contact with arbitrary curvature of the latter. 1 il.

Description

This invention relates to non-destructive testing and can be used with ultrasonic testing.

The aim of the invention is to expand the scope of use by allowing control of curved surfaces.

The drawing shows the proposed device.

The device comprises a housing 1, brackets 2 and 3 installed therein with the possibility of axial and lateral movement, as well as rotation relative to the fixing screw 4, connected to brackets 2 and 3 through tared elements 5 pushers 6 fixed to the pushers 6 through

volumetric elastic elements 7 emitting and receiving transducers 8 and 9, made of elastic piezoelectric material with interdigital bipolar placed on its surface, and sample holder 10 of controlled material, made in the form of height-adjustable stops 11. Emitting converter 8 through high-frequency connector 12 connected to the generator 13 probe pulses. The receiving transducer 9 is connected via a high-frequency connector 14 with an amplifier 15. The outputs of the generator 13 and the amplifier 15 are connected to the inputs of the electronic cluster 16. One of the inputs of the key 16 is connected to the output of the generator

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ratora 17 counting pulses, the output of the key 16 is connected to the counter 18 pulses.

The device works as follows.

The signal from the probe pulse generator 13 simultaneously arrives at the key 16 and the radiating transducer 8, which excites in the product 10 a surface acoustic wave propagating to the receiving transducer 9. The key 16 opens the passage of pulses from the generator 17 to the counter 18. The signal received by the transducer 9 surface the acoustic wave is amplified by the amplifier 15 and closes the key 16. By the number of counting pulses passed during the passage of the acoustic wave, its velocity which is judged on the quality of the surface of the sample 10 of the controlled material.

Due to the fact that the transducers are made of elastic piezoelectric material in the form of interdigital two-terminal and mounted on the crown

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Claims (1)

In the case of axial and transverse movements and rotation relative to the attachment point, a stable uniform acoustic contact is established between the transducers and the material surface with an arbitrary curvature of the latter. Claims An apparatus for monitoring the physicomechanical characteristics of the surfaces of materials, comprising a housing mounted therein with the possibility of axial movement of at least two brackets attached to them emitting and receiving transducers and the sample holder, characterized in that, in order to expand the field of application the ability to control curved surfaces, the brackets are installed with the possibility of transverse movement and rotation relative to the attachment point, and The drivers are made of elastic piezoelectric material with interdigital bipolar circuits deposited on its surface.