SU1357706A1 - Device for checking defects of surface - Google Patents

Abstract

The invention relates to a measurement technique and can be used to monitor surface defects. The purpose of the invention is to provide continuous monitoring of point damage to enamel insulation of wires and wires. The device contains a laser 1, a collimator consisting of lenses 3 and 4, axicon 5, collecting lenses 6 and 7, a successor of radiation 8. Plates 9 and 10 of transparent material are mounted between lenses 6 and 7, on which guide rollers 11 and 12 are fixed. Holes 9 and 10 have holes for moving the controlled wire 13. Receiver 8 is included in one of. the shoulders of the bridge circuit, in the other arm of which a second radiation receiver 15 is mounted, is installed in the path of the beam reflected from the beam splitter 2. When the bridge 13 wire is well insulated, the circuit is in equilibrium. If there are defects on the surface of the wire 13, a part of the flux is dissipated and does not fall on the lens 7, the current of the radiation receiver B decreases, on the indicator 19, included in the diagonal of the bridge circuit, a signal appears. To increase the sensitivity of the device, additional lenses 20, radiation receivers 21, and photoelectric information processing unit 22 can be installed between the transparent plates 9 and 10 to determine the light flux dissipated from defects. 3 hp f-ly, 1 ill. (L has eaten about Oi

Description

The invention relates to a measurement technique and can be used to monitor surface defects.

The purpose of the invention is to provide continuous monitoring of point damage to the enamel insulation of wires.

The drawing shows a schematic diagram of a device for monitoring surface defects.

The device contains a light source, for example, laser 1, behind which a beam splitter 2 is installed. After it, lenses 3 and 4 are successively arranged, forming a collimator, axion 5, lenses 6 and 7, and radiation receiver 8. Lens 7 and radiation receiver 8 are arranged in such a way that

the image of the focal plane of the radiation 20 incident on the receiver 8.

3, created by the lens 7, is in the plane of the receiver 8. Between the lenses 6 and 7 there are two transparent plates 9 and 10 on which the guide rollers 1 1 and 12 are fixed, the axis of rotation of which is perpendicular to the axis of the laser beam and below it at a distance equal to the sum of the roller radius and the control radius changes with time. When a defect hits the focal plane of lens 6, light is scattered on it and

. 5-8 radiation decreases. To eliminate the effects of fluctuations in the power of the laser 1, a channel is used formed by the beam splitter 2, the gray optical wedge 14 and the receiver 15 of the emitted wire. In the plates performed-30 radiation. With the help of gray optical apertures for placement of the examined wedge 14 align the light

the fluxes on the 8 and 15 radiation receivers with a quality wire 13. In this case, the bridge circuit formed by 35 receivers 8, 15 and resistors 16 and 17 is in equilibrium. With the other wire 13, guided by the rollers 11 and 12 to the moving mechanism (not shown). On the path of the beam reflected from the beam splitter 2, there is a gray optical wedge 14 and a radiation receiver 15. The radiation receivers 8 and 15 and the resistors 16 and 17 form a bridge circuit, in one of the diagonals

when a defect falls into the focal plane of the lens 6, the equilibrium of the bridge circuit is disturbed, which is fixed

which source 18 is included, for example, indicator 40. To detect

The indicator 19 should be located in the other. Between the plates 9 and 10 there can be a set of lenses 20 whose optical axes lie in the plane of intersection of the rays that pass through lens 6 with the wire 13 and form the axes of the metrics of regular polygons whose sides lie in the plane x lenses 20. Radiation receivers 21 are located in the planes of the image of wire 13 produced by lenses 20 and connected to photoelectric information processing unit 22, to which radiation receiver 15 can also be connected.

The device works in the following way.

The laser beam 1 is expanded by a collimator formed by lenses 3 and 4.

defects of wires of different diameter, it is necessary to shift the lenses 4 and 6 in the direction of their main optical axes in such a way that the light ring

/

45 turned out to be in the place where the focal plane of lens 6 was located at the exit from the collimator parallel to the beam of rays.

To determine the angular coordinate

50 defects as a radiation receiver 8 use a videocon.

To increase the sensitivity of the device and to approximately determine the angular coordinate of the defect

55, an additional channel is used formed by the lenses 20, the radiation receivers 21 and the photoelectric information processing unit 22. Light scattered on the defect, falling

An extended parallel beam of rays hits the axicon 5, which develops a parallel beam along the generatrix of a cone. Lens 6 collects a beam of rays in its focal plane into a ring whose diameter is equal to the diameter of the wire 13. In the focal plane of the lens 6, the rays are reflected from

the enamel coating of the wire 13 and fall on the lens 7, which creates an image of the focal plane of the lens 6 in the plane of the radiation receiver 8. Rollers 11 and 12 fixed on

transparent plates 9 and 10, provide the translational movement of the wire 13 along the main optical axis of the lenses 3,4,6 and 7. In the absence of defects, the magnitude of the luminous flux.

does not change with time. When a defect hits the focal plane of lens 6, light is scattered on it and

when a defect falls into the focal plane of the lens 6, the equilibrium of the bridge circuit is disturbed, which is fixed

defects of wires of a different diameter need to shift the lenses 4 and 6 in the direction of their main optical axes so that the light ring

/

5 turned out to be in the place where the focal plane of the lens 6 was located at the exit from the collimator, parallel to the beam of rays.

To determine the angular coordinate of the defect, the video detector is used as the radiation receiver 8.

To increase the sensitivity of the device and approximate determination of the angular coordinate of the defect

5, an additional channel is used formed by the lenses 20, the radiation receivers 21 and the photoelectric information processing unit 22. The light scattered at the defect falls on one or several lenses 20, and then on the radiation receiver 21, the electrical signals from which arrive at the photoelectric information processing unit 22, where they are compared with the signal from the radiation receiver 15.

Claims (3)

1. A device for monitoring surface defects, containing a source of light sequentially mounted on the same optical axis, A cone that collects a lens and a radiation receiver, characterized in that it is equipped with a collimator, a second collecting lens and two transparent plates with guide rollers for the test wire to ensure continuous monitoring of the point damage to the enamel insulation of the wires, a light source and an axicon, and two plates and a second collecting lens are installed between the first collecting lens and the radiation detector, 2. The device according to claim 1, which is based on the fact that it is supplied by G.Volkov Compiled by L. Lobzova Tehred A. Kravchuk Order 5986/37 Circulation 677 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and printing company, Uzhgorod, st. Project, 4 It is an indicator, a beam splitter, installed between the light source and the collimator, an optical wedge. and a second radiation receiver, sequentially located on the path of the light beam splitter reflected from the light, and the radiation receivers are included in the bridge circuit, the diagonal of which includes an indicator, 3. The device according to claim 1, wherein the first radiation receiver is designed as a vidicon, 4, The device according to claim 1, characterized in that, in order to increase the sensitivity of the device, it is equipped with a photoelectric information processing unit, a set of lenses installed between two transparent plates along the sides of a regular polygon so that the optical axes of the lenses coincide with the axes of symmetry of the polygon and lie in the plane of intersection of the rays that have passed through the first collecting lens, as well as radiation receivers, each of which is located behind the corresponding lens and is connected to the photoelectric processing unit What information. Proofreader O. Kravtsov