SU104294A2 - Optical device for densitometer - Google Patents

Description

Basically auth. St. No. 93790 on the same person described an ontic device for a densitometer, however, having the disadvantage that it does not eliminate the possibility of diffusion scattered light on the photosensitive surface of the photocell, which affects the measurement result.

In order to eliminate this drawback, an improved device is proposed, the main distinguishing feature of which is the use of a mirror image, cut out from an enlarged image of the measuring layer, a precisely limited and constant section of the field.

Diagram of the optical device shown} III drawing. The light from the source / passes through the co-sensor 2 and the prism-cube 3, a layer of such dimensions, which lies on the hypothetical grains reflecting a layer of such dimensions that oi completely covers the layer of the pupil of the micro-lens 4, standing after the prism-cube. That part of the light beam that does not fit on this reflective layer passes to the right and forms an image of the ends of the spiral of the lamp.

on the control screen, that allows the lamp to be installed correctly.

Micro-lens 4 gives a smaller image of the exit pupil of the condenser on the instrument's column, where the measured phonogram is placed.

The light beam, which is microscoped through the phonogram, passes through the second microscope lens 6 and, after reflection in iris, me 7 gives an enlarged image on the mirror bottom of me 8, but almost completely perpendicular to the beam axis.

The mirror aperture is a flat mirror with a circular aperture, through which the light passes behind the mirror and enters the photocell — or alternately on one of the photocells located behind the mirror aperture near the rotating prism 9, which throws light from one photoelectric cell to another. The rest of the light reflected from the mirror of the aperture 8 at a small angle to the normal of the mirror passes through the lens 10 and forms on the screen 11 a secondary image of the phonogram. which is viewed through a magnifying glass 2. In this secondary image, the measurable spot can be seen as a black circle, the position of which can be chosen with greater accuracy due to a significant increase.

In order to prevent the extraneous light from entering the photocell through a magnifying glass and a screen, a mechanical shutter is provided in the device that closes the opening of the lens 10 and opens the opening in the mirror aperture 8 at the time of measurement. In the drawing, the damper is not shown, also the protection is not specified.

cylinder on rotating prism 9.

Subject matter Invention Optical device for a densitometer for measuring the density of a phonogram according to the ed. St. L 93790 characterized by the fact that, with the aim of eliminating the penetration of the diffuse ;; diffusion of a layer of light on the photo-. The photocell has a sharp surface, it uses a mirror diaphragm, cutting out from the magnified image of the section of the layer to be measured, a precisely cut and constant field of parts of the floor.