SU1249448A1 - Device for measuring directional patterns of ultrasonic transducers - Google Patents

Description

The invention relates to the field of destructive tools and control methods and can be used for ultrasonic inspection of products. The purpose of the invention is to increase the sensitivity of measurements of the radiation patterns of ultrasonic transducers.

Fig. 1 schematically shows a device for measuring radiation patterns, Fig. 2 shows the same side view, section view.

The proposed device contains a semi-cylindrical sump 1, for, movably attached to it bracket 2, receiving sensor 3 mounted on bracket 2, two oppositely-polarized magnets 4 mounted on bracket 2 from two opposite sides of the acoustic duct 1, on the cylindrical surface of which grooves 5 of triangular cross section. The receiving sensor 3 is made of two piezoplates 6 and 7, the angle between which is determined from the relation;

And cf + 2 arcsin (C -C gin- -),

l BOS.

where the angle of the groove,

 speed of sound in contact fluid;

WITH

- shear wave velocity in

sound duct.

The acoustic contact of the receiving sensor -3 with the sound guide 1 is made with the help of a contact fluid 8, for example, a ferromagnetic liquid.

A device for measuring radiation patterns of ultrasonic transducers works in the following manner. The converter 9 under study is placed on the flat surface of the sound duct 1, radiating ultrasonic shear vibrations into the sound duct 1. The oscillations propagate along it and, falling on the edge of the sound duct, the contact liquid is refracted and transformed into longitudinal vibrations, which are fixed by the receiving sensor 3. circular paths record the distribution of the amplitude of the shear waves emitted by the object under study

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by the developer, i.e., a radiation pattern is constructed. In order to obtain the maximum sensitivity of the measurements of the radiation pattern, it is necessary to choose an angle h such that

transparency center on the energy of the interface zpukoprovod - contact lskost was maximum, and the radius

the curvilinear surface envelope of the 16 6d2 sound duct 1 was larger -;,

 where d is the radius of the piezoplate of the transformer under study, D is the wavelength of the shear oscillations. These conditions, S5, determine the distances between the triangular grooves, which are chosen such that the ratio ot (R is an order of

where is the radius of the chimney, which corresponds to a change in the reception angle of shear vibrations by 1-2 °. Thus, the proposed device allows to increase the sensitivity of measurements of the directional diagrams of ultrasonic transducers, as well as to increase the noise immunity.

thirty

Claims (1)

Invention Formula A device for measuring radiation patterns of ultrasonic transducers, containing a semi-cylindrical acoustic duct, a movable arm fixed on it and a receiving sensor mounted on a bracket, characterized in that, in order to measure the measurement sensitivity, it is equipped with two opposite-polarized magnets. new on the bracket on two opposite sides of the chute, on the cylindrical surface of the latter there are grooves of a triangular cross section, and the sensor is made of two piezoplates , the angle between which is determined from the ratio o (h + 2 arcsinCC.; C sin--), where H - the angle of the grooves; C is the speed of sound in contact fluid, C is the velocity of shear waves in the sound pipe. figure 1 Editor A.Shishkin Compiled by N. Slusarenko Tehred M. Khodanich Proofreader E. Sirohman Order 4230/46 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 eri 2