SU1523974A1 - Method of determining transparence of sector of diffusing medium - Google Patents

Abstract

The invention relates to gas analysis and can be used to measure the opacity of automobiles, airplanes, pipes of industrial plants, etc. The aim of the invention is to expand the range of objects to be examined and to increase accuracy. This is accomplished by simultaneously sending, through the test section of the gas jet, towards each other beams of probing radiation and receiving at an angle of 90 ° to the direction of probing of the scattered radiation. The values of this radiation determine the transparency and opacity of the jet area. 1 il.

Description

The invention relates to gas analysis and can be used to measure the smoke emission of automobiles, airplanes, industrial pipes, gas flares, etc.

The aim of the invention is to expand the dialect of people being examined. objects and accuracy.

On the imp represented the implementation scheme of the method.

The method is carried out as follows.

Through the test section 1, gas beams of probing radiation from the pulsed 2 and modulated are simultaneously sprinkled towards each other. sources with coordinates

and R. respectively. From two

boundary points of this site with coordinates K ,, and R at an angle of 90 ° to the direction of sounding, respectively, at two points with receivers 4 and 5 with coordinates R with; and K respectively take scattered radiation and measure it. At the same time, the radiation transmitted from the same point at an angle of 40 ° to the receiver does not come at the same time (due to the different path lengths).

The magnitudes of the signals that are scattered at an angle of 90 to the sounding path

at

points R and K ,,),

on jet boundaries

reduced by squared distance, cr (;. are derived from the expressions

R (R ,, Pj - Р, (L ,, Rj (R., - Rgf- - AJ .a-ir, (R) (“,, But) T (Kg, P.); P (R ,, R,) - P, (R ,, nO (Rj - RJ A l, G -,., (Rj) -T (R ,, Rj. TfR, Hj

(R3, Rfe),

where L is a constant source2;

P is the radiation energy of the source

2;

 - p-1 - scattering coefficient under

90 ° angle;

T (R ;,;) transparency of the sections Hn ;, l-, 1 1,2,3, ...,

R,

T (R ,, R ,; exp - j e. (R) dr},

R;

J 1, 2.3,. . ; where (d) -) transparency

When sending a probing radiation by a second source, a signal from the jet scattered at an angle of Ti / 2 from the boundary of the jet and

set per square distance are defined as 1

S (R, Rj) - Pr (H4,, - RS)

- ..CR) T (R5, R) T (R., R,) X

T (R., R,);

S (R4, R,) -, Ri) (R3 -Rj. A, P, G -, (R,) T (R, Rj T (Rj, Rj,

where A is the source constant 3;

 - radiation energy of source 3.

Measurement of the scattered signals can be carried out in any non-collinear direction of motion of the jet plane (otherwise it is impossible to intersect the optical axes of the receivers and sources).

The ratio of the signals S (R ,, Rj.) And S (R, 4) received from the jet boundaries at the point Rj is equal to

S (R, RC) A, p, T (R ,, Kg)

Sir ;; Rj TiRj7 R; 7Trp ;,

As can be seen, the ratio of signals scattered at point H at an angle iT / Z when sending radiation from two opposite directions does not depend on the values characterizing scattering B in this direction. If the signals scattered at the point P ... were measured, under an arbitrary angle Lf (for the first direction of the transmission) and, accordingly, IP (dp for the second direction of the probing radiation) ratio

5 (H ,, R,.) / S (R4, R,

-b, (K2) / SG, 8 „.. (N

fu media with indicatrix scatter

(

 .p

difference between Ots and G would be a significant error in the measurement results. In this case, the registration of signals scattered at an angle for both directions of the probing radiation is equal to S (RI, R.,) / S (R4, R2) ,,, (R ,,) / (RI) (dependence on the indicatrix missing).

Similarly, the ratio of the signals S (R ,, Rj) and TnR, Rj) received from the jet boundaries at the point R..J is defined as

PIA G .en.o 10. due to neglect

bring in

S (R ,, RJ) A, p, T (R ,, RI) T (RO, RS)

Ш1, А; Р

Ttr

The ratio of these expressions gives

 at

S (R ,, R ;; S (R, R) SlR. -R T-SrR rRlT 2 "T (Ri, R) T (Rj, Rj) - exp -2 I (r) dr. - RI

G f 1 Exponent exp J- f 5 (r) dri

This is a factor equal to

the ratio of the magnitude of the radiation transmitted through the stream P to the sent P. Dp value passed through the layer UR RH - R. radiation P is true the following expression (Bouguer law):

g P P,

exp

g

{- e (r) dr (.

R,

The ratio of P / PP is different

exp (r) dr | t.

H

From the value obtained, it is possible to judge the smokyness of the jet, since the physical magnitude of the opacity is related to the transparency characterizing the coefficients. (

by formula

transmission band

N (1-1;) -100%.

S (R ,, R,) S (R Rtl-SlR-.rR T S -rRJXr then the opacity value is obtained cooTHOPieHHH

rE (lliJJiilSlRii Ri): Gn4, BUT-8 (.k ,, n-jT

N

ig

Thus, knowledge of the values of the signals scattered at an angle of 90 to the sounding path from the jet boundaries, no3BOjmeT, obtain the values of the opacity of gas jets, i.e. expand the range of objects under study.

According to the method, the opacity value is determined strictly at a given jet width and does not depend on the hardware constants and radiation energy. In this case, the medium between the source, receiver, and the specified boundaries has no effect on the measurement result. This follows from the fact that the expression for N does not contain additives due to the passage of radiation through the medium surrounding the jet, i.e., the attenuation in the areas fR, RJ, RJ, n, RgJ, L 5, 6 1 the environment (the occurrence of mist, dust, and so on) thus does not affect the result of the measurement of opacity. The possibility of sending probing pulses simultaneously allows the exclusion of

OO%.

and

osma rai and. and Ooka, who is concerned with the errors due to the temporal variability of the medium in the jet.

The invention allows to extend the functionality of a known method - both by measuring the transparency of 1-11 (smoke) jets with a fast-per-1 –1 HI1 concentration under conditions that can be used

10 is only a small base between the radiation sources, HanpjfMep, in technological processes, automotive noise sensors, in spaces of limited size.

15

Claims (1)

Invention Formula The method is to determine the transparency of the area of the scattering medium by scrubbing through this section towards each other of the probing radiation beams, measuring at two points the values of the scattered radiation from the first two points (to this area 25, respectively, and determining the required transparency by them, distinguished by the fact that, in order to expand the range of the objects under study and to increase accuracy, the beams of the probe radiation are sent through section of the medium at the same time, the scattered radiation from the two boundary currents-H (to the section-a of the medium is measured at an angle of 90 to the nagging of the sounding and The ir measured value is judged on the transparency of the medium section.