SU763700A1 - Radiation videometer - Google Patents

Description

one

The invention relates to technical means for special aerial surveys and measurement of the intensity of radiation (reflection) of various natural objects and backgrounds in the field of view.

A device for measuring the intensity of radiation, consisting of a scanner-reflector, built-in Q emitters and an optical system ij, is known.

The device has a number of drawbacks: passive scanning time is several times longer than useful, while reducing the instantaneous angle of view 15, the ratio between the speed and altitude of the carrier should be reduced, the only way to check the sensitivity. . The vitality of all optoelectronic kanaats when measuring is the Calib-20

POBI.

A device containing an optical-mechanical system according to the Kennedy scheme, radiation receivers, 25 signal processing and recording units 2} has a large useful scanning time.

However, this device does not contain elements of the automatic calibration of the optical-electronic path as in. ,thirty

sensitivity and linearity of the display when registering images from a cathode ray tube, which requires electrical synchronization of scanner movements and scanning. The prototype cannot be used as a measuring system, since it does not contain calibration emitters, and the two spectral channels are spatially separated, which excludes the possibility of automatic digital processing and correlation analysis, requiring spatial and temporal coincidence of events, i.e. sync.

The purpose of the invention is to increase the accuracy of measurements due to the automatic calibration and calibration of the entire optical-electronic path with an increase in the resolution of the device and synchronous aerial survey in at least two intervals of the spectral range.

This is achieved by the fact that, in the device, the rotating reflective prism of the scanner is made of four-sided, two rotary reflector screens are installed symmetrically for the introduction into the field of view of the system

Three calibration reference emitters placed outside the main optical channel, and a point source of radiation is built in the center of the middle X-axis reference emitter; a dichroic filter lens is placed on the optical axis of the lens.

This embodiment of the device provides automatic calibration of the entire optical-mechanical path.

The functional diagram of the proposed device is shown in the drawing.

The radiation video meter contains a rotating reflecting tetrahedral prism scanner 1, two spaced apart, 2 and two contacting 3 immobile flat reflectors. A mirror lens 4 and a dichroic filter lens 5 with a cooling device are used to focus the radiation flux shortwave uncooled radiation detectors 7 are installed in the focal planes. Calibration is provided by two rotating flat screens reflectors 8, calibration reference radiators 9, 10, side and middle 11, in the center of which is built a calibration point radiation source 12. The radiation receivers have preamplifiers 13 and 14 connected to the processing units 15 and registration signals. One of the preamplifiers, for example, contains, after a radiation receiver, a pulse of 16 autocollimadi- nal reeflections, line changes in the viewing band 17, levels 18, 19 and 20 of signals from three calibration reference emitters, a signal burst 21 corresponding to the inclusion of a calibration point radiation source.

The proposed radiation video meter works as follows.

In aerial photography, radiation in an instantaneous angle of view from the terrain of the field of view enters the rotating four-sided reflector prism scanner 1, on the adjacent faces of which a split of the radiation flux occurs. Both portions of the streams are transmitted by identical optical channels consisting of two spaced 2 and adjoining 3 fixed planar reflectors. The radiation is combined into a common flux on the mirror Objective 4, with which the D54x5 of the conventional filter lens 5 has a long-wave part of the radiation focused on the sensitive areas of the multilayer structure of cooled radiation receivers b, and the short-wave part is focused on the non-cooled radiation receivers 7. Sensitivity verification occurs after each scan in the span,

when the faces of the scanner 1 are in perpendicular-parallel planes (dotted position) with respect to the plane of the sensitive area of the radiation receiver b, for example. As a result of the autocollimation re-reflection of the sensitive area of the cooled radiation detector 6, an impulse 16 of polarity opposite to the polarity of the changes of the 17th row in the viewing band is created. The amplitude of the autocollimation pulse 16 practically depends on the depth of cooling of the radiation receivers 6 and 7, and the VC duration depends on the angular resolution of the optical system (instantaneous viewing angle). While maintaining the sensitivity of the entire opto-electronic path, the parameters of the pulse 16 remain unchanged and, after passing through the preamplifiers 13 and 14, are monitored in the signal processing and recording units 15.

To calibrate the entire optoelectronic path, the main optical measuring channel is covered with rotating screens reflectors (8 position with dotted lines). In this case, sequential sequential scanning of the side 9, middle 11 and side 10 calibration emitters with adjustable and controlled radiation in the blocks 15 of the radiation intensity occurs (for short-wave radiation by the current of the heat, long-wave by its own temperature of the radiator). During calibration, the signal has three levels 18, 19, and 20, corresponding to three known intensities of the calibration reference emitters 9, 11, and 10. For an amplitude interpretation of the radiation intensity of aerial survey objects, the intermediate quantitative values of the 17 line changes in the viewing band are determined by interpolation between levels 18 , 19 and 20. From the calibration reference emitters 9, 11 and 10. On the recorded infrared aerial photograph of the ground scan along the flight path of the aircraft, three gradations of density can be obtained Blackened photographic image to determine the radiance photometry investi-aerolandshafta researched objects and backgrounds. Verification of the linearity of a line sweep in an aerial photograph is checked by turning on a calibration point source of radiation 12, which corresponds to a burst 21 on the signal, and in the straight line aerial photograph is strictly in the center of the frame

The device allows, with increasing resolution, to obtain not only a qualitative picture of the luminosity of objects and backgrounds of the aerial landscape simultaneously in several ranges, but also to have quantitative

Claims (2)

Claim A radiation. Videometer containing an optical-mechanical system according to Kennedy’s scheme, radiation detectors, a rotating reflective prism scanner, signal processing and recording units, characterized in that, in order to increase the measurement accuracy, the rotating reflective prism is made tetrahedral and two symmetrical drives are additionally installed in the device • a reflector screen for introducing into the field of view a system of three calibration standard • emitters located outside the main optical channel and in the center of the middle Calibration Standard integrated emitter point source of radiation on the optical axis of the opto-Mechanical job Coy system placed dichroic filter lens. ’Θ Sources of information taken into account in the examination 1. Copyright certificate of the USSR ”325900, cl. G 01 J 1/1 "", 1968. 2. Safronov Yu.P. and Elman R.I. 15 Infrared recognition devices. M., Military Publishing, 1976, p. 148. VNIIIPI Order 6269/35 Circulation 713 Signed ______ Branch of the SPT '' Patent ’’, Uzhhorod, st. Proletnaya, 4