RU1800427C - Method for atmosphere inverse scattering index determining - Google Patents

Abstract

The invention relates to atmospheric optical characterization methods used in meteorology and for environmental monitoring. The essence of the invention lies in the fact that the first and second receiving devices measure the intensity of the radiation transmitted through the studied path of the atmosphere, when they are sent in opposite directions towards each other, the directions of the second and first emitting devices, respectively, and the magnitude of the backscattering coefficient t on the quotient of the product of the intensities of the opposing echo signals from the total scattering volumes and passing through the path under study. 1 ill.

Description

The invention relates to atmospheric optical characterization methods used in meteorology and for environmental monitoring.

The purpose of the invention is to improve the accuracy of the measurement of backscatter coefficient.

The implementation diagram of the method is presented in the drawing.

The method is carried out as follows. Monostatic light locators 1 and 2 are located at the ends of the path on which the studied point r is located, which measure the echo signals (backscattering signals) received from point g irradiated alternately from opposite directions by the radiating devices of locators 1 and 2 For the echo values from point g, the following expressions can be written:

P (Ro. R) A2P02 Au (g) exp (-2 fRo e (r) dr). (1)

P (Ri. R) A2Po2 atg (g) exp {-2 1 k (r) dr, (2)

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Joint venture

where P (R0, r), P (R.i, r) are the intensities of the echo signals from point r, recorded respectively by the locators 1 and 2;

AI and A2- hardware constants of locators 1 and 2;

Po1, Po2 - radiation energy of locators 1 and 2;

ol (g) is the coefficient of backscattering of optical radiation at the point g;

e (g) - attenuation coefficient at the point g

exp {- / Ro E (r) dr), exp {- к (r) dr - respectively, the transparency of the sections R0. r. r, R2.

The value of the signal transmitted through the studied route, detected by the locator 2, when sending its locator 1 can be written as follows:

P (R0, Ri) A2P0i exp {- / J1 к (r) dr. (3)

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Accordingly, when sending radiation by the locator 2, the magnitude of the signal recorded by the locator 1 is equal to:

P (Ri, Ro) AiPo2exp {-.

The products (1) on (2) and (3) on (4) are equal to:

P (Ro, r) P (Ri, r) AiA2PoiPo2 Oft (g) exp {-2x, 0 4: (r) dr}, (5)

P (Ro, - Ri) P (Ri. Ro) AiA2PoiPo2exp {-2) dr}. (6) 15

Substituting in (5) instead of AiA2P0iPo2expx e (r) dr} their value from (6), equal to P (R0, Ri,) P (Ri, Ro), we obtain: 20

P (Ro, r) P (Ri, r) o & (r) P (R0, Ri) P (Ri, Ro) - (7)

From (7) it is easy to find the backscattering coefficient:

(- f P (Ro. g) P (Ri. g) 1,071 (r} P (Ro, Ri) P (Ri, Ro) J,

1/2

which does not depend either on the instrument constants or on the energies of the probe radiation

x, 0

fifteen

twenty

25

thirty

of measurements (and, therefore, it is resistant to scatter), and is determined only by the magnitude of the backscattering signals from the studied point r and the signals passing through the path between the locators, and does not require taking into account the complete attenuation of the radiation (transparency) of the sounding path between the locators 1 and 2 , as in the prototype, which, in turn, eliminates errors in the determination of s / (g) due to this.

Claims (1)

The claims A method for determining the atmospheric backscatter index, in which sounding echo signals are transmitted by two locators and scattered by the atmosphere in two opposite directions towards each other, characterized in that, in order to increase the accuracy of measurement, radiation intensities are additionally measured. passing through the studied path of the atmosphere, respectively, from the first to the second locator and from the second to the first locator, and the value of the backscattering coefficient is judged by the quotient of the division the knowledge of the intensities of the opposing echo signals from the total scattering volumes and passing through the path under study.