RU1793415C - Scanning system - Google Patents

Abstract

Usage: study of thermal fields. SUMMARY OF THE INVENTION: the device comprises two optical channels, a scanning element of paired inclined mirrors, the reflecting surfaces of which are oriented in opposite directions, a scanning element drive and two radiation receivers located in one housing, 6 cpfs, 4 silt.

Description

The invention relates to optics and may find application in optoelectronic devices, for example, thermal imagers. .

Various scanning systems are known, including two-channel, containing two 1J radiation detectors. A conventional two-channel scanning system with a scanning element consisting of paired inclined planar mirrors 2. The presence of two separate photodetectors having an inevitable spread of geometric (physical) characteristics, including due to errors in adjusting their spatial position, affects the quality of the image formed with their help . If the television tube is the visualization tool, the image quality may be reduced due to the limited number of resolution elements per line on its screen.

In addition, in this system, performance is limited due to the presence of only one mirror in each channel.

The aim of the invention is to improve image quality and speed.

The invention is characterized by the content of its formula.

In FIG. 1a shows a diagram (first embodiment) comprising a telescopic system with concave 1.2 and convex 3.4 mirrors, the latter being mounted on a pivot axis; 5.6 - flat mirrors of the scanning element; 7.8 - mirror lenses; 9.10 - capacitors, 11 - photodetectors with sensitive elements (pigv): the receiver mounted on the axis of rotation (Fig. 16).

In FIG. 2 is a raster shape obtained using the circuit of FIG. 1.

In FIG. Figure 3 shows a second embodiment of a system on which there are: 1,2-inclined, twin mirrors mounted rotatably around an axis (to change the shape of the raster); 3.5 and 4.6 are telescopic systems; 7 is a faceted scanning element with a rotation axis connected to engine 8; 9 - lens; 12 - photodetector with a window 10 and a line of sensitive elements 11.

In FIG. 4 shows an exemplary signal processing and image acquisition circuit using a CRT, which shows: 1 - a photodetector, 2 - a signal preamplifier unit, 3 - an electronic switch with a pulse distributor 4; 5 - video amplifiers; 6.7 - TV tubes, sim

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metrically arranged relative to a common axis directed to a common screen 10 of sheet material.

In the diagram of FIG. 1e, the axes of the lenses 1 and 2 are directed to the object plane at an angle 2 and to each other, which ensures a raster with a 2: 1 format (figure 2), in which the relatively narrow field of view of each lens is used more fully image quality is also improved compared to using a single wide-field lens. Consider the action of the circuit. The radiation stream passes to two lines of the receiver

Claims (2)

1-3-5-7-9 11 through the elements: . When ko2-4-6-8-10 swings of the scanning element, the image of the sensitive elements is scanned along the lines in the predominant plane. In order to reduce the number of these elements and, accordingly, electric channels, it is possible to use interlaced scanning by oscillating the photodetector around the axis (Fig. 16) having sparse rulers (Fig. 1c) in time with the oscillations of the scanning element. The scheme allows the possibility of zooming by rotating around the axis of the mirrors 3,4, which excludes the telescopic system from the device. In FIG. 3 radiant flux from the object is directed parallel to the branches m 2-4-6-7-9-10-11 FOCUSING on the right and left halves of receiver line 12. When vibrating (or rotating) around an axis, the image is scanned. This scheme allows to increase the speed, since the scanning element can be more than two faces. The rotation of the mirrors 1.2 around the axis provides a change in the shape of the raster. For signal processing, the circuit of FIG. 4 can be used. From the photodetector 1 signals on p the channels follow the chain: 2-3-5-i -10, a 2: 1 format image on the screen, whereby the possible number of decomposition elements per line is determined 0 the sum of these numbers for two television tubes, which increases the resolution of the system. In this case, the screen area (usually round) of each tube is used more fully, which helps to reduce the dimensions of the device (if we compare the 1: 1 format with the 4: 3 format). Images from the screens of 1: 1 format tubes fit tightly together on a common screen, in a 2: 1 format. The common screen 10 is made of any sheet material, for example frosted glass. The claims 1. A scanning system comprising first and second optical channels with means for zooming and orienting the optical channels in space, a scanning element of paired inclined mirrors, equipped with a drive, two radiation receivers, an optical system and imaging devices, each optical channel being connected with an appropriate radiation receiver through a scanning element and an optical system, characterized in that, in order to improve image quality, the reflective surfaces of the inclined mirrors with aniruyuschego element are oriented in opposite directions, and the radiation receivers are arranged in one housing .. 2. The system according to claim 1, with the proviso that the housing of the radiation receivers is located between the sides of the inclined mirrors made with holes coaxial to the axis of rotation of the scanning element, and radiation receivers are oriented in the direction of the openings in the respective oblique mirrors. h. The system according to claim 1, characterized in that the axis of rotation of the scanning element coincides with the angleless structure between the paired inclined mirrors, and the radiation detectors are located symmetrically with respect to the axis of rotation of the scanning element. 4. The system of claim 2, wherein the fact that the radiation receivers are installed rotatable around an axis parallel to the axis of rotation of the scanning item. 5. The system of claims. 2 and 4, characterized in that each optical channel is made of a concave mirror with a hole and a mirror facing it, and the convex mirrors of the optical channels are fixed with the possibility of synchronous rotation around an axis coinciding with the plane of symmetry of the system. 6, A system according to claim 3, characterized in that each optical channel is made of a flat mirror with a hole, a concave mirror with a hole and a convex mirror, and the holes in the flat and concave mirrors are coaxial, the convex mirror is placed in the hole of the flat mirror, which is installed at an angle and can be rotated around the axis of the hole. 7. The system according to claim 1, characterized in that the visualization means are made in the form of coaxially arranged television tubes equipped with a common screen made of sheet glass.