SU1700510A1 - Medium transparency determining method - Google Patents

Abstract

This invention relates to meteorology and hydrology. The optical circuit for implementing the method comprises a light source 1, two photodetectors 2 and a signal block 3. By varying the position of the source on the direct connecting two photodetectors, analytical expressions can be obtained for the transparency of the atmosphere in the medium between any two positions of the sources. The resulting expression does not depend on the hardware characteristics. The method allows to increase the measurement accuracy for optically dense media. 1 il.

Description

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This invention relates to meteorology and hydrology.

The purpose of the invention is to improve accuracy.

The drawing shows a block diagram of a device for implementing the method.

A device for implementing the method includes radiation sources 1, photodetectors 2, unit 3 measuring signals from photodetectors 2.

Receiving devices 2 register the radiation from the radiation source 1 in its two positions, which are selected on the segment of the direct connecting device 2.

In the signal measurement unit 3, the following four signals are received:

pi A p -TiT un;

P2 -. TIIT un;

ps-tfp .TAn: (1)

P4 - Type

where p and flows emitted by the source and two opposite directions to the receiving devices;

Tii - transparency of the area between the two positions of the source;

TIP and tIP is the transparency of the medium for the segment between the source and receiver, which does not include the other position of the source;

A and instrumental constants of photodetector devices 2.

Using the analytical combination of the values of the measurement signals (1), the formula for calculating the TIR and

(No.)

P3P4 /

1/2

The locations of the radiation receivers can be chosen arbitrarily, but the distance between them should not exceed the distance between the receivers.

The use of the method allows to increase the accuracy, since it eliminates the influence of the hardware constants and the influence of the medium when using reference signals, and also performs measurements with high accuracy in optically dense media.

Claims (1)

Claims The method for determining the transparency of a medium includes measuring at the first and second measuring points the values of the respective light fluxes pi, p2 from a radiation source located at the first test point, and then processing the measurement results, characterized in that, in order to improve the accuracy, the points are additionally measured with the values of the respective light fluxes p3, p from the radiation source, which is located at the second test point, and the control points are placed dy measuring points on the passing straight therethrough and the transparency T is determined i§ expression t (no.) P3P4J 1/2