SU145382A1 - Device for visual inspection of products when x-ray or radioactive radiation is detected - Google Patents

Description

DEVICE FOR VISUAL CONTROL OF PRODUCTS

WHEN CHECKING THEM X-RAY OR

RADIOACTIVE RADIATION

Taken on August 19, 1960, for jYa 676837/25 B Committee on Inventions and Discoveries at the Council of Ministers of the USSR

Published in the A62 5 Invention Gazette 1962.

Devices are known for visually monitoring products when they are x-rayed or radioactively illuminated. A rotating disk with radial slits is used for scanning the image, and an electron beam tube with an afterglow is used as an indicator.

However, the known devices do not provide multi-line still images of the studied areas of the product.

The proposed device does not have this drawback. This is accomplished in that the cathode-ray tube is equipped with three systems of beam-deflecting rollers, two of which serve for horizontal and vertical deflections of the beam and are powered by a sawtooth voltage generator synchronized with the rotation of the sweep disk. The third coil system is connected to a step pulse generator, also synchronized by photoelectric signals. Pulses of the generator serve to inform the beam of an additional vertical displacement in order to obtain} P1 on the multiline recording screen of the image.

The drawing schematically shows the proposed device.

The source / radiation emits rays 2, which, passing through the lead diaphragm 5 with a rectangular slit, are formed into a beam of a cross section, the size of which overlaps the weld lunpiiHy of the controlled product 4. The rays from the product 4 fall into the slit 5 in the lead screen 6 and - excite the crystal. The brightness of the crystal is controlled by a photomultiplier 8.

A rotating disk I is not permeable to rays is placed between the test article 4 and the radiation receiver. The speed of rotation of the disk I have a number of radial slits 10, synchronization o 145382

It is driven at the speed of movement of product 4. Thus, the shadow image of the gap is scanned.

The signal output from the photomultiplier tube is amplified by the video amplifier 11 and is fed to the modulating electrode of the receiving tube 12.

Three generators are used to implement a multi-line still image on the screen. The sawtooth generator 13 serves for vertical scanning, the step type generator 14 for vertical scanning, the sawtooth current generator 15 for horizontal scanning. These generators are synchronized by synchronizing pulses with the help of illuminator 16 and photocell 17. Pulses arise when one hole in the disk coincides with the photocell. The number of holes in the disk corresponds to the number of slots. Such Oi6pa30M, at the beginning of each vertical line, a pulse arises at the output of the photocell, which can be directly used to synchronize the generator 13 of the ramp current of the vertical scan. The rate of increase of the sawtooth current, provided by the generators 13 and 15, should be proportional to the speed of movement of the controlled article. The matching of the speeds of movement of the product and the beam on the screen of the receiving tube is carried out with the help of a synchronizing device 18, which produces a voltage with an amplitude proportional to the repetition frequency of the synchronizing pulses. This voltage controls the steepness of the current rise in the generator 15. When the current in the horizontal deflection coils reaches a value corresponding to the maximum beam deflection on the screen, the control impulse 20 is generated through the reverse circuit. Zi is fed to the input of the generator 15 horizontal scanning, carried out with; shhr0nizatsiya. At the same time, a control pulse is applied to a 14-step current generator, which changes the amount of current in the declining Coils by one step, corresponding to the vertical displacement of the beam along the schvina width. The mode-.m generator 14 is selected so that, after passing through the last stage, the control pulse returns the beam to the first row.

Subject invention

A device for visual inspection of products when x-ray or radioactive radiation is detected by using a rotating disk with radial slots for scanning an image, and as an indicator for a cathode ray tube with an afterglow, characterized in that, in order to observe a multi-line tube on the screen a still image of a moving translucent product, the cathode ray tube is equipped with three systems of beam deflecting coils, two of which serve for horizontal and The vertical deviations of the beam are fed from sawtooth generators synchronized with the rotation of the sweep disk, and a third system serves to feed a stepwise curve shape to it for a multi-line recording of the image.

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