SU570861A1 - Method of determining geometric parameters of photographic system for bubble chamber - Google Patents

Description

one

The invention relates to a physical experiment technique using stereophotogrammetric method for retrieving information.

Methods are known for determining the theometric parameters of a photographic system by stereo photographing a system of reference crosses. In the volume being photographed and measuring images. The disadvantages of such methods include the fact that, in the presence of only a flat system of reference crosses, they do not provide an OPPORTUNITY to correct the coordinates of the INPUT Pupils of photogrammetric cameras, more precisely, the height of these pupils above the plane of reference crosses.

There is also known a method for determining the geometrical parameters of a photographic system of a bubble camera by stereo photographing a system of reference crosses in the photographed Volume and measuring images, according to which a prism with a system of reference crosses on its planes is pressed against an illuminator glass and the system of crosses is photographed. However, this method is characterized by insufficient accuracy of determining the height of the entrance pupils and the loss of part of the volume being photographed.

The purpose of the invention is to determine the height of the entrance pupils of photographic lenses

bubble chamber systems with a two-dimensional system of fixed crosses.

This goal is achieved by simultaneously taking photographs of the reference crosses on the window-glass plane, photographing imaginary images of the entrance pupils of camera lenses are photographed, for which the photographs are taken In several stages according to the number of cameras by installing at each stage one of the cameras photosensitive material.

The drawing shows a diagram of the device on which the proposed method is dried.

Claims (2)

The scheme includes lenses 1 and 2 of the cameras, glass porthole 3 of the bubble chamber, engraving plane of the frame system. In object space 4, leveling glasses 5 and 6 of the cameras, condenser 7 and light source 8. To simplify the drawing, the thickness of the porthole glass is reduced to air . The pupil images of lens 1 formed due to the reflections of light on the planes of glass-window 3 are labeled respectively G, 1 and I, and the images of the entrance pupil of lens 1 in the picture plane of the lens 2 are through G2, and the reference crosses on the glass-window is Pb PS ..-, and their images in the plane of the 2-P lens, the picture Scale of the image of the plane of reference crosses is determined based on the measurement of the distance between the reference crosses on the glass window and the distance between their images in the picture planes of the photographs measures. These measurements give ratios; 1 M f. Where HI and H2 are the HEIGHTS of the entrance pupils of lenses 1 and 2 above glass-illuminator 3, F1 and Fz-focal lengths of cameras 1 and 2, M) and M2 are the scale of the image of the plane of reference crosses 4 in photo cameras 1 and 2. It is possible to obtain data for the following, their relations: (I. +,) (1, 2) Φ (11 – Я Na + 2d) - M (2. 2, (Я, + Yaa +) (1.2) M {3, 2) Fo (1,2), 2 where 5 () is the distance between the axes of cameras 1 and 2; C (1,2), 2) 1 is the corresponding distance in the picture plane of the camera 2, (1,2) is the image scale for the imaginary image plane of the entrance pupil of camera 1 in the first glass surface of porthole 3, etc., d - reduced to the air thickness of the glass-window. From the measurements of the distances between the axes of cameras Bi, 2 and the measurements of the distances C between the axes of the cameras and images of the entrance pupils of the cameras in the picture planes of the cameras, it is possible to determine the scales of the images for the plane of imaginary entrance pupils of the cameras Al (i, 2) for the first imaginary image, M2.2 - for the second imaginary image, and so on. From here, on the basis of the relation (2) it is possible to obtain Ф, 2d (М (2,2) - М (1. 2)) (3) and using expression (1), find the entrance pupil heights for the camera 2. Ya MsZd L1 (2, 2) -4 (1,2) And, similarly for other cameras, the OPPORTUNITY makes it possible to find the heights of the entrance pupils of the objectives, thus achieving the same goal as in the case of photographing two flat systems of reference crosses located on known distance from each other. Advantage of the method is also the fact that the position of the images of the entrance pupils on the photographic material is easy to obtain information about the tilt of the photo system relative to the glass window or the wedge shape of the glass window. The invention method for determining the geometrical parameters of a photographic system of a bubble camera by stereo photographing a system of reference crosses in the volume being photographed and measuring the image, characterized in that, in order to determine the height of the entrance pupils of lenses of a photographic system of a bubble camera with a two-dimensional system of reference crosses, on the glass-aluminum plane, simultaneously with the photographing fixed crosses photograph imaginary images of the entrance pupils of camera lenses, for which The survey was carried out in several stages, according to the number of cameras, by installing an illuminator in one of the cameras and a photosensitive material in one of the cameras. t and ,, Pf2,) f2 ,,