SU1500928A1 - Piezoelectric transducer - Google Patents

Abstract

The invention relates to non-destructive testing and can be used in the development of test sensors. The aim of the invention is to increase the stability of the characteristics of the sensor. The piezoelectric sensor contains a piezoelectric element 1 installed in the housing 4 with a protector 2 attached to it in the form of a polygonal cellular plate with electrodes in the central part 9 and on the corners 10 on the inner surface and a shrinkable lead ring 3 fixed in the annular groove of the front part of the body 4. the internal volume of the housing is filled with an elastic elastic compound 5, and the protector 2 with its corners is pressed into the shrinkage ring 3 and soldered to it. 2 Il.

Description

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The invention relates to non-destructive testing and can be used in the development of test sensors.

The aim of the invention is to improve the stability of the characteristics of the sensor.

FIG. I shows a piezo sensor, a slit; in fig. 2 - arrangement of electrodes. On the protector.

. The device contains a piezoelectric element 1, a protector 2, made in the form of a polygonal (in particular, square) sitall plate with electrodes deposited on its inner surface, a shrinkable lead ring 3 fixed in the annular groove of the front part of the cylindrical body 4. The internal cavity of body A is filled in the acoustic elastic insulating and sealing compound 5. The electric contact with the electrodes of the piezoelectric element 1 is through flexible terminals b and the stand 7 mounted on the mounting plate 8. On the inner surface of the tread 2 electrodes are deposited (by firing silver) in the central part 9 and on the corners 10, the piezoelectric element 1 is attached by soldering to the electrode 9, and the tread 2 is pressed into the shrinkable lead ring 3 with its corners flush with the end face of the body 4 and It is attached to it by soldering along the angular electrodes 10 (the melting point of the solder should be less than the solder for soldering the piezoelectric element).

The piezoelectric sensor works as follows.

flaT4t; K is established by the working surface of the tread 2 on the controlled surface with the provision of acoustic contact. When electrically excited the piezoelectric element 1

Acoustic oscillations are excited, which are transmitted through the protector 2 to the controlled article. At the same time due to the lead shrink ring

3 and acoustic connection of the piezoelectric element Goat housing 4 is provided to the zooplastic compound 5. By soldering the piezoelectric element 1 to the inner electrode 9 of the protector 2 and pressing the protector 2 into the shrinkage ring 3 flush with the end of the body

4, the acoustic contact is stabilized between piezoelectric volume I and protector 2, as well as between the protector and the item being monitored, thereby stabilizing the characteristics of the piezoelectric sensor. In addition, it is possible to control the electroacoustic characteristics of the sensor directly during the assembly process after soldering the piezoelectric element to the protector.

and carrying out culling.

Claims (1)

Formula of the second phase. Piezoelectric sensor, comprising a housing, installed. in the body, a piezoelectric element with a protector attached to it, the volume of the body being filled with a sound-elastic compound; characterized in that, in order to increase the stability of the characteristics, it is equipped with a lead shrinkage ring fixed in an annular channel of the end part of the body, the protector is made in the form of a polygonal plate of alumi ses with electrodes on the inner surface in the central part and at the corners, the piezoelectric element is attached by soldering to the central electrode of the protector, and the protector is pressed in its corners. shrink lead ring flush c. the end of the case and attached to it by soldering on the angular electrode; 0US.Z