SU1610450A2 - Recorder of transparence of atmosphere - Google Patents

Abstract

The invention relates to instrumentation in the field of atmospheric optics and meteorology and can be used to determine the optical parameters of the atmosphere, in particular the transparency and level of aerosol pollution, as well as to predict the operation of optical systems and optical communication systems. The purpose of the invention is to improve accuracy with a long dosing range. The device contains a radiation source 1, a receiver 2 with an optical system, a delay line 3, a first differential amplifier 4, a recording unit 5, a control unit 6, a functional converter 7, a second differential amplifier 8, a comparator 9, a threshold element 10 and a timer 11. 2 or .

Description

4 SP

Yu

The invention relates to instrumentation in atmospheric optics and meteorology, and can be used to determine the optical parameters of the atmosphere, in particular, transparency and the level of aerosol contamination, as well as to predict the operation of optical systems and optical communication systems.

The invention is an improvement of the known device described in the author. f 530298.

The purpose of the invention is to increase the accuracy of measurements with long-range sounding.

FIG. 1 shows the block diagram of the recorder {in FIG. 2 shows graphs of the amplitude of the received signal x, the delayed signal x, the reference signal y and the difference signal z.

The device comprises a radiation source 1, a receiver 2 with an optical system, a delay line 3, a first differential amplifier 4, a recording unit 5, a control unit 6, a functional converter 7, a second differential amplifier 8, a comparator 9, a threshold element 10 and a timer 1T.

The device works as follows.

The source of radiation 1 by the start signal from control unit 6 sends a probe pulse to the atmosphere. Radiation diffused in the opposite direction arrives at the photodetector 2 with an optical system having an extended field of view that overlaps the entire sounding zone. At the same time, the start signal is started from the control unit 6 by the control unit 6. The output signal of the receiving unit 2 is divided into several channels: on the first channel it arrives at

the first input of the registration unit 5, through the second channel it enters the input of the first differential amplifier 4, the third channel passes the signal through the delay line 3 to the second input of the differential amplifier 4, through the fourth channel it arrives at the input of the second differential amplifier 8 and through the fifth channel - to the input of the functional converter 7. From the output of the first differential amplifier 4, the difference signal is fed to the second input of the recording unit 5. Upon the arrival of the control signal from the second output of control unit 6 in the first and second channels of the register unit 1, signals are recorded. When the signal passes through the functional converter 7, it is converted, in which the signals of small amplitude from the distant sections of the path are amplified with a large factor. The reference signal y formed at the output of the functional converter 7 is fed to the second input of the differential amplifier 8, at the output of which a difference signal appears, z - y - X. At time t, when the difference signal S at the output of the first differential amplifier 4 is zero , a comparator 9 is triggered, according to the signal of which the control unit 6 generates a control signal at the third output, allowing registration of the signals Z and y in the third and fourth channels of the registration unit 5, respectively. The difference signal z registered in these channels and the reference signal y allow to obtain a measurable signal xy - z from the distant segments of the path to distances z, while in the first channel the signal x (g) from the segment of the path can be measured distance g with the same threshold sensitivity of the recorder channels. In this case, the measurement error is reduced by a factor of K:

TO

A (x) A (y)

where A (xJ is the amplitude range of the XJ signal

A (y) - and the shlitudny range of the reference signal y.

When the recorder operates with a threshold element 1 0. The control unit 6 generates at the third output a control signal1 allowing the registration of signals 2 and y in the third and fourth channels of the recording unit at time tj when the threshold element 10 is triggered when the reference signal reaches a predetermined threshold Level Ud. This time t; fixed by the timer, which is activated by the start signal from control unit 6 and switched off by the signal of threshold element 10. The threshold level value Up sets the amplitude range of the reference signal A (y) and the distance Gde from which the signal is recorded

through a compensation circuit using an adaptive reference signal.

Claims (1)

Invention Formula Registrar of transparency of atmospheres by auth. No. 530298, characterized in that, with a precision circuit, a second differential amplifier is inserted in it, one input of which is connected to the output of the radiation receiver, and V-code to the third input of the recording unit, a functional converter, the input of which is connected to the output of the radiation receiver , and the code to another input of the second differential Editor M. Bandura Compiled by M.Zhukov Tehred M.Hodanich Order 3738 Circulation 341 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 1 04 506 the amplifier and to the fourth input of the registration unit, a comparator whose input is connected to the output of the first differential amplifier, and the output to the first additional input of the control unit whose additional control output is connected to the additional control input 10 of the registration unit, the threshold element, the input of which is connected to the output of the functional converter, and the output to the second additional input of the control unit, and a timer, 15 whose first input is connected to the output of the threshold element, and the second input to the first output of the control unit, tj 01.8.2 Proofreader A. Obruchar Subscription