SU165075A1 - SYSTEM OF AUTOCOLLIMATIC LIGHTING AND PHOTOGRAPHING OF BUBBLE CAMERAS - Google Patents

Description

The systems of autocollimation illumination and photographing of bubble chambers are known, which contain a reflective raster that is installed at the bottom of the working volume of the chamber opposite the protective glass, a light source and photographic lenses arranged symmetrically with respect to the source of the sing. In the known systems, the glare of the light sources of the protective glass is eliminated by the inclination of the glass itself, which causes considerable complications of the camera and does not completely eliminate the glare (it is almost impossible to achieve a significant inclination (10-15-15), while at small angles of inclination the glare move from the center of the pictures to the edges. In addition, the inclination of the glass, even at a small angle, leads to the complication of mathematical processing of images. In the proposed autocollimation light system, glare is eliminated by the appropriate position of the photo lenses against the camera (the photographic basis is chosen greater than the camera’s horizontal position) and used to illuminate the astigmatic light source camera: a parallel section perpendicular to the length of the perpendicular to the length of the perpendicular to the frame. . When using lighting, the focal lengths of the reflective raster in two mutually perpendicular sections are different and are in a 2: 1 ratio. FIG. 1, 2, and 3, a schematic of the proposed autocollimation lighting and photographing system in three projections is presented. The luminous flux from the light source /; aralized by condenser 2 so that the stream width in the side projection (see Fig. 2) is equal to the width of the illuminated chamber volume. With the help of a cylindrical lens 3, the luminous flux diverges in frontal projection (see Fig. 1). Thus, the protective glass 4 of the camera and the reflecting raster 5 impinge a luminous note, a parallel or almost parallel in cross section, perpendicular to the length of the chamber, and diverging (as if from a point Si in a mutually perpendicular section. Reflecting raster focuses the incidental light note to the Si point by converting this astigmatic flux to a sigmatic stream converging to the Si point. The Si point is the center of curvature of the reflective raster in the frontal projection and the focus of the raster in the lateral projection. etovogo flow necessary that the focal distance in front of the raster nroektsii was twice mensche focal distance in lateral projection.

The camera is illuminated by a luminous flux, reflected by a raster and picked up after refraction of the PA bubbles in photographic lenses 6. The transverse basis of photographing (the distance A between the photographic lenses) is chosen to be greater than the width B of the camera. Then the light reflected by the camera's protective glass surfaces does not get into the photo lenses, since the light flux in the side projection is parallelized or almost parallel to the lens. The condition on the allowable divergence of the luminous flux, in which the first-order flare is eliminated (after a single reflection), is recorded as

2

L - g -2r N

where 2a is the size of the light source in the lateral projection / is the focal distance of the capacitor, 2.0 is the size of the entrance pupil of the photographic lens, and I is the distance from the raster 5 to the photographic lens 6.

Selection of Lee values // achieve the elimination of high-order glare, fuss | as a result of multiple reflections on the surfaces of glass 4. It is significant that the brightness of the flare increases with the number

reflections and therefore it is sufficient to eliminate the glare of the first, third, and n order, i.e., the light fluxes that build the image at the S, S, S points

Subject invention

A system for autocollimating and photographing bubble chambers containing a reflective raster mounted on the bottom of the working volume of the chamber opposite the protective glass, a light source and photographic lenses arranged symmetrically with respect to the light source, differing

so that, in order to eliminate the glare of the light source from the protective glass of the camera, the photo lenses are set at a base distance exceeding the width of the camera; for illumination, an optical scheme was used that converts the light flux from a light source into an astigmatic: parallel in cross section perpendicular to the length of the camera, and diverging in mutually perpendicular cross section, and focal lengths of reflective

raster in two mutually perpendicular sections are different and are in a 2: 1 ratio.