SU1624395A1 - Device for non-destructive testing of objects using gas discharge visualization method - Google Patents

Abstract

The invention relates to non-destructive testing and inspection of objects by registering the optical parameters of a gas discharge that occurs near a controlled object introduced into an electric discharge gap under the influence of a high-voltage electric field. The aim of the invention is to expand the functionality of the device by increasing the information obtained in the study of objects. For this, the gas discharge is carried out under the conditions of an electric field of a special configuration created in the cell between the rod electrode 1 and the package containing the dielectric plate 2, perceiving information, the gas-filled gap 3, the additional di-. an electric gasket 4 with a hole to maintain the gap 3 in the range of 0-500 µm, the gasket 5, which is non-transparent for discharge, the object to be monitored 6, the dielectric layer 7 and the flat metal electrode 8. The electrical and optical parameters of the discharge are recorded by devices 10 and 11, respectively . 2 Il. (L S ogo со o so o

Description

1

The invention relates to non-destructive testing and inspection of objects by registering the optical parameters of a gas discharge that occurs near an electrically discharged interval introduced by a test object under the influence of a high-voltage electric field.

The aim of the invention is to expand the functionality of the device by increasing the information obtained in the study of objects.

This goal is achieved by the fact that the gas discharge is carried out under the conditions of an electric field of a special configuration, for which purpose a discharge cell is created that allows the avalanche discharge to be combined in a narrow discharge gap with a discharge developing along the surface of the dielectric. The object to be examined is placed on a basic metal electrode coated with a dielectric layer. Between the second electrode, made in the form of a rod with a pointed end and located approximately opposite to the center of the surveyed area of the object, a dielectric strip is placed parallel to the surface of the object. Between the gasket and the surface, the object is created with a gas-filled discharge gap, the optimal size of which (Not more than 500 µm) is selected empirically. This distance is fixed by a gasket with a hole, and the discharge voltage from the high voltage source ioro is supplied between the main electrode and the pointed rod.

FIG. 1 shows the scheme of the proposed device, the formation of a photodischarged discharge directly into the discharge cell; in fig. 2 - the same, the image formation with the removal of the optical recording system beyond the limits of the discharge gap.

The device contains a pointed rod electrode 1, a dielectric plate 2 that receives or transmits the image of the discharge (glass, film, photographic paper, plate, luminescent storage screen, etc.), gas-filled gap 3, additional dielectric gasket 4 with aperture for. maintaining a gap in the range of 0-500 µm, the gasket 5, which is opaque to the luminescence emitted by the discharge, in order to avoid parasitic illumination of the film with an image of an object that catches a rotating object 6, a dielectric layer 7, a flat metal electrode 8, a source power supply; a device 10 for recording electrical parameters of the discharge; a photoregistration device 11, the variants of which may be a visual observation camera (telescope, microscope, etc.), a camera, a television camera (including recording an image on video recorder), fsto receivers array with image output

A computer and a display, a photoelectric device for recording the integrated and spectral intensities of luminescence, and others. The sequence of operations during operation of the device is as follows. Collect the discharge cell in accordance with FIG. 1 or 2; include discharge voltage, applying single pulses or their continuous sequence; according to the control images of the discharge corona or by controlled discharge parameters, a certain quality or level is achieved for exemplary objects by adjusting the size of the gas gap, the amplitude of the supply voltage, the duration of a continuous pulse sequence, fix the technological modes of operation of this cell; the object to be inspected is placed into the discharge gap and the discharge parameters are recorded; analyze the data obtained by comparing it with those for exemplary objects. According to the findings, the differences are judged on the state and properties of the object being examined.

The proposed device expands the functionality of the gas discharge visualization method by more fully using information about the test object enclosed in the discharge crown.

and electrical and optical discharge parameters.

Claims (1)

An apparatus for non-destructive testing of objects using a gas discharge visualization method, comprising a package of a rod electrode, a dielectric plate serving as a carrier for the sample image and a flat electrode, characterized in that in order to expand the functionality by increasing the information obtained in the study of objects, a gas-filled gap of no more than 500 microns is made between the dielectric plate and the sample, and a dielectric layer is placed between the sample and the flat electrode. 1-8 9 2