SU819595A1 - Device for measuring optical characteristics of camera tubes - Google Patents

Description

(54) DEVICE FOR MEASUREMENT

OPTICAL CHARACTERISTICS OF TRANSMITTERS

TELEVISION TUBES

television tube 9 with a photosensitive surface 10, fi lens focus, cross section of a light beam car, ± o diaphragm opening diameter, clt raster lens diameter; K-step of a raster, size of a circle scattered d, focus of lenses of a raster f.

The device operates as follows. The beam from the radiation source 1 passes through the forming optical system 2 and the filter 3 and forms a light spot on the diffuse diffuser 4. The radiation diffused by the diffuse scatterer 4 through the opening of the diaphragm 5 enters the aperture of the objective 6 and, after passing through it, is converted into a quasi-parallel radiation beam. This radiation beam enters the lintel diaphragm raster 7. A radiation beam trapped in each of the lenses of the raster 8 is focused on the photosensitive surface 10 of the transmitting television tube 9 to form a scattering circle 11.

Introducing the diffuse diffuser 4, the diaphragm 5, the objective 6 and the lens raster 7, into a known device allows creating on the photosensitive surface 10 of the transmitting television tube 9 a system of illuminated points — scattering circles formed by each of the diaphragm raster lenses arranged in a plane step vertically and horizontally). The size of these scattering circles dz is determined by the divergence of the radiation beam at the output of lens 6 and the focus of the diaphragm lenses (the areas between the surfaces of the raster lenses are made opaque to eliminate the influence of highlights from the gaps between the raster lenses) of the raster

di "2W-f2

where eW is half the angle of divergence of the radiation.

The irradiance in the diffuse circles can vary both with a change in the transmittance of the filter 3, and with a change in the diameter do of the diaphragm. To increase the luminosity of the system, the diffuse diffuser can be made in the form of a fiber-optic washer with the direction of the axes of the fibers parallel to the beam axis, or in the form of a plate with cylindrical channels covered with a reflective coating - when operating in the infrared region of the spectrum. This is possible because at the output of the fibers of the optical fibers the indicatrices of the scattering have a certain divergence value.

The spectral energy and geometric characteristics are measured when the radiation source is turned on and its intensity is changed, for example, using filter 3. The size of the video signal taken from the transmitting television tube 9, depending on the light intensity in the focused lens

scattered circles is the desired characteristic. At the same time, geometric distortions are also measured by measuring the distances between the centers of the scattering circles obtained in the image and comparing them with the scraper tip, taking into account the scale factor of the electronic path. The reduction in measurement time is quantified by the number of raster lenses.

0 An experimental sample of the proposed device was made and tested. It uses a diaphragmatic lens raster with a step h. 1.7 mm and lenses with a diameter of di 1.5 mm. The device allows the creation of a vidicon target.

12 images of scattered circles with a diameter of 1000 to 50 microns. The range of working wavelengths from 0.35 to 3 μm when operating from a monochromator and at fixed wavelengths of 0.63; 1.15; 3.39 µm using an LG-126 laser as a radiation source. The range of illumination in the diffuse spot varies from 10 to 10 lux. The period error of the created circles is scattered by coordinates .x :, at no more than 1%.

5 When using optical materials that are transparent in a more distant region of the spectrum, the working range of the proposed device can be expanded accordingly.

0 Comparative tests of the device showed that a significant technical effect was achieved - the test time was shortened by more than 10 times, the high accuracy of determining geometric distortions in transmitting

television tubes.

A device for measuring the optical characteristics of transmitting television tubes can be used in monitoring systems for optical and energy characteristics of Vidicons, image intensifiers, dissectors, etc., as well as television spectrozonal systems.

Claims (2)

1. Krivosheev MK, Kustarev A. A. Light measurements in television. M., “Holy, 1975, p. 116. 2. Krivosheev MK, Kustarev A. A. Light measurements in television. M., “Holy, 1975, p. 109 (prototype).