SU1218498A1 - Device for controlling brightness of image of optronic converter screen - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to improve the clarity of the image on the screen of the electron-optical converter (EOC). The amount of luminous flux (ESP) radiated by the EIT screen, within any adjustment cycle, is proportional to the magnitude of the signal of the reference source, thereby achieving the integral of the image luminance, ESP, emitted by the EOP screen, between turning on the first switch 4 15 is taken into account by the integrator with reset 1 in the next adjustment cycle, which achieves a high adjustment accuracy, 1 sludge. (L from 00 4ih U9 oa

Description

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The invention relates to radio engineering and can be used to adjust the image at the output of an electron-optical converter while observing light-emitting objects of variable brightness.

The purpose of the invention is to increase the clarity of the image on the screen of the electron-optical converter (OOP).

The drawing shows a structural electrical circuit device.

The device for adjusting the brightness of the image on the EIT screen contains an integrator with reset 1, the second constant voltage source 2, the comparison unit 3, the first switch 4, the pulse driver 5, the first element of the back delay 6 the second switch 7, the pulse generator 8, the first source constant voltage 9, the second delay element 10, the first low-pass filter 11, the second low-pass filter 12, the electro-optical converter 13 with a microchannel plate 14, the photoelectric flux acceleration chamber 15 and the photocathode 16, the photoelectric cell nonstoichiometric converter 17 and the third source of DC voltage 18.

The device works as follows. in a way.

The pulse of the pulse generator 8 starts the second switch 7, supplying the potential of the third source of constant voltage 18 to the second delay element Yu and the second low-pass filter 12. The rising potential from the output of the second low-pass filter 12 is post-connected to the input (photocathode 16) of the photoelectric flux acceleration chamber 15, ensuring the growth of the working potential difference between the electrodes of the chamber at the permissible non-equipotentiality of the electrodes, and the signal from the output of the second delay element 10, which delays by the time of Establishing the minimum operating potential difference between the electrodes of the photoelectric flux acceleration chamber, opens the first switch 4, which connects the second source of constant voltage 2 to the first low-pass filter 11.

Light emission Converted by photocathode into photoelectric switch 184982

the current that passes the acceleration chamber of the photoelectric flux and enters the input of the microchannel plate, creating an electronic

with the image of objects of observation.

The growing potential from the output of the first low-pass filter 11 is fed to the output of the microchannel plate 14, creating a potential difference

0 between its electrodes with the permissible non-equipotentiality of the electrodes, providing a fairly uniform distribution of the gain over the image field of the plate.

5 The enhanced electron flow from the output of the microchannel plate 14 enters the output of the image intensifier 13,. is converted into light, which in photoelectric converter 17 is converted into an electrical signal proportional to the luminous flux from the screen, and goes to the integrator's signal input with a reset 1. The output signal of this

5 integrator, proportional to the sum of the luminous flux emitted from the screen of the image intensifier 13, is fed to the input of the comparison unit 3, which at the time of the signal coincides with the reference value

The voltage of the first voltage source 9 resets the accumulated voltage on the integrator with the reset 1 and turns it on, and also turns off the first switch 4, which disconnects the second constant source 5 of the voltage 2 from the first low-pass filter 11. The falling potential on the output of this filter reduces the gain of the plate 14, and the signal from the output of the pulse generator 5, delayed by a time sufficient for the gain of the plate 14 to drop to a negligible amount, turns off the second switch 7, which shuts down the source of the third DC voltage 18 from the second lowpass filter 12. The potential difference between the electrodes of the chamber 15, accelerating the photoelectron flow drops to zero and the electro-optical converter 13 is turned off.

The next pulse of the pulse generator.8 starts the second

5, switch 7 and the entire cycle is repeated.

The amount of luminous flux radiated by the converter's transducer to

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In any adjustment cycle, it turns out to be proportional to the magnitude of the signal from the source of the reference signal, which achieves the constancy of the integral luminance of the image during the observation.

The sum of the luminous flux radiated by the converter's screen between the time when the first switch is turned off and the photoelectric flux acceleration chamber is turned off is taken into account by the integrator with reset 1. In the next adjustment cycle, this results in a high adjustment accuracy.

The image brightness is controlled by the magnitude of the signal from the reference source, the resolution and the uniformity of the gain along the plate are determined by the delays of the delay lines.

Claims (1)

Invention Formula A device for adjusting the brightness of the image on the screen of the electron-optical converter, containing a pulse generator sequentially connected to the first source of constant voltage and the comparison unit, the output of which is connected to the lock input of the first switch and to the reset input of the integrator with a reset whose output is connected with a second input of the comparison unit, a photoelectric converter, the output of which is connected to the signal; integrator input with reset, the second constant voltage source, the output of which is connected to the signal input of the first switch and the third constant voltage source, characterized by By the fact that, in order to increase the image clarity on the screen of the electron-optical converter, containing a photoelectric flux acceleration chamber with a microchannel plate at the output, the sequentially connected pulse generator, the first delay element, the second switch and the second delay element, the first and second low-pass filters, the outputs of which are connected respectively to the ми micron channel plate and the photocathode of the electron-optical converter, the output of the second delay element -with input otpira-; The first switch, the output of which is connected to the inputs of the first low-pass filter and pulse generator, the output of the pulse generator is connected to the unlocking input of the second switch, the signal input of which is connected to the output of the third constant-voltage source, and the output to the second low-pass filter input.