SU49426A1 - Apparatus for determining inhomogeneities in solid, liquid and gaseous media by means of ultrasonic vibrations - Google Patents

Description

In the practice of various technological processes, it is necessary to detect internal inhomogeneities in various environments, for example, to determine inhomogeneities (defects) inside metal products or various inhomogeneities in a liquid or gaseous medium.

For these purposes, it is advisable to use ultra - sound vibrations. There are a number of methods and devices for using ultrasonic vibrations to determine inhomogeneities, but they all have the disadvantage that they provide an opportunity to determine only the location of the heterogeneity without giving an opportunity to get an outline of the heterogeneity on the screen.

In order to eliminate this drawback, i.e., to obtain a picture of the inhomogeneity of the test medium on the screen, the Brown tube, the screen of which is made in the form of a solid or mosaic quartz plate, charges from which they are taken by the electron beam and are received by the foresight receiver, giving a picture of heterogeneity, on the screen.

In FIG. Figures 1 and 2 depict two versions of the Brown tube design used to study inhomogeneities.

Mosaic 5 (Fig. 1), consisting of a large number of small piezoelectric crystals of the same thickness, is glued along the ends and applied to the base of a conventional tube / Brown. The outer surface of the mosaic is covered with a continuous metal electrode 4, the inner surface of the glass tube, which is occupied by the mosaic, is covered with a grid of small metal electrodes 3, isolated from each other like a photosensitive mosaic in the Zvorykin system. The mosaic can be placed both inside (fig. 1) and outside the tube (fig. 2). Instead of a mosaic, you can take a homogeneous piezoelectric crystal plate, since the latter is excited only at the points of incidence of ultrasonic vibrations and, accordingly, only at these points do charges appear.

Ultraviolet oscillations, upon exiting the medium under investigation, fall on a piezo-electric mosaic, as a result of which mosaic elements under the action of ultraviolet oscillations create corresponding electric charges, which can be 2 cathode tubes through metal insulated electrodes you and further strengthened. A device capable of reproducing a photograph of an inhomogeneity can be precisely made using the Zvorykin scheme.

The subject matter of the invention.

A device for determining inhomogeneities in solid, liquid and gaseous media by means of ultrasonic vibrations, characterized in that in order to obtain a picture of the heterogeneity of the test medium on the screen, the Brown tube is used as a receiver of ultra-sound vibrations after they exit from the test medium. in the form of a solid or mosaic quartz plate, the charges from which are removed by the electron beam in order to influence the foresight receiver.

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