SU140224A1 - Device for lighting in stereophotogrammetric instruments - Google Patents

Description

In known devices for lighting in stereophotogrammetric devices, for example, stereocomparators made in the form of complex optical condensers or in the form of elliptical reflectors, one of the drawbacks is the spatial arrangement of the lighting and optical parts and assemblies, which significantly increases the size of the device. In addition, lighting devices with incandescent lamps heat the film, which causes its deformation, reduces the measurement accuracy and does not provide uniform illumination.

The proposed device is made in the form of a transparent plane-parallel plate that serves as both a snapshot holder and an illuminator. This makes it possible to significantly simplify the design of the device, provide a more uniform illumination throughout the field and reduce the heating of the film.

FIG. 1 and 2 shows a schematic representation of the described device; in fig. 3 shows an organic glass plate with one fluorescent lamp.

The transparent plane-parallel plate /, depending on the purpose of the device, is made of optical or organic glass and has dimensions slightly larger than the dimensions of the measured images. All faces of the plate are polished. One of the bases and non-working side faces of the plate are coated with white opaque paint. The plate serves at the same time as a snapshot holder and an illuminator, since one or several luminescent lighting lamps 2 are located near the working transparent side faces, and the negative or slide 3 on the glass or hyphenka is mounted on the upper plane of the plate.

The light from the fluorescent lamps, the passage through the polished face inside the plate, is repeatedly reflected from its faces and evenly illuminates the image. To adjust the brightness of the image, a second cylinder with a slit 4 along the generatrix serves.

For a projector like a stereoplang, the described device can be made so that plate I is put on the negative or slide 3 after they are installed on the application frame of the device. If the device contains a single fluorescent lamp, then the plate / is fastened with screws to a metal base 5 with a cylindrical rod for mounting on a transverse carriage. The fluorescent lamp is mounted in a metal soffit 6, having pin connectors 7. On the plate / reinforced metal limiting squares 8 and clamps I made in the form of eccentric sleeves with springs, used to secure the image or pressure glass.

On the plate / in the plane of installation of the image at the point of intersection of the direct connecting opposite coordinating marks, the center is designated as two concentric rings with different diameters, which facilitates the orientation of the image in the instrument.

The described device can be used in stereo plans as well as in expedition stereoscopes for viewing images.

Subject invention

A device for lighting in stereophotogrammetric devices, such as stereocomparators, is distinguished by the fact that, in order to reduce overall dimensions, to obtain a more uniform illumination across the entire field of the image, as well as to reduce film heating, it is made as a transparent plane-parallel plate that serves simultaneously as a film holder and illuminator, one of the bases and non-working side faces of which are covered with white opaque paint, and near the working transparent side faces are the same or how luminous lighting lamps.

Surfaces coated with white paint or mirror surfaces (silver plating, aluminum)

The surface is covered with evil. paint FIG. one

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Surfaces covered with white paint Surface covered with or mirrored surfaces White paint

(silvering, aluminum)

Surface covered

White painted ali or mirror surfaces (silvering, aluminizing)

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// / / / V v eloy paint

FIG. 2