SU1726916A1 - Method of determining spatial distribution of flame physical parameters - Google Patents

Abstract

Usage: measuring equipment for flame diagnostics. Summary of the Invention: Electromagnetic radiation is directed, and selected flame areas at the wavelength AI, receive from these regions a signal for the interaction of radiation with the medium at the wavelength Ar and determine the spatial distribution of physical parameters according to the intensity of the received signals. In this case, the probing directions are chosen collinear, the direction of reception of the signals of interaction of radiation with the medium is kept unchanged when probing all the selected areas, from these areas the signals of interaction of radiation with the medium at wavelength Az are taken in the chosen direction of reception as well as in the opposite direction and determined spatial distribution of physical parameters according to the algorithm D, LPnCfe), is a physical parameter at the nth point of the section; L is the proportionality coefficient; RP (A2) is the intensity of the received signal from the n- and point at the wavelength (Aa) i P (Az), Pn (Az) - the intensity of the received signals from the n-th point at the wavelength Az b in the forward and opposite directions x 1 il. CL

Description

This invention relates to a measurement technique for diagnosing a flame.

There is a known method for determining the physical parameters of a tribe by irradiating it with a radiation beam and then isolating and registering a signal due to the interaction of the probe beam and the medium under study.

The disadvantage of this method is the low accuracy of determination in the conditions of optical inhomogeneity of the medium under investigation.

The closest to the present invention is a method for determining the spatial distribution of the physical parameters of a flame, which consists in irradiating it with a radiation beam, extracting a signal caused by the interaction

the probe beam and the medium under investigation, and the recording of the spatial distribution of this signal. Optical radiation shines through the object of study, for example, a flame. The result of the interaction of radiation and plasma may be laser-induced fluorescence, Raman scattering, etc., which are also radiation. Allocating a signal due to this interaction for different regions of the flame allows one to register its spatial distribution.

The disadvantage of this method is the low accuracy of determination in the conditions of inhomogeneity of the measurement object, since the irregularity of the optical PLOTG

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flame when probing different points of a selected section directly affects the measurement result.

The purpose of the invention is to improve the accuracy of determining the spatial distribution of the physical parameters of the flame.

The goal is achieved in that according to the method of determining the spatial distribution of the physical parameters of the flame, consisting in the direction of the electromagnetic radiation at a fixed wavelength of Ah in selected areas of the flame, measuring the interaction signals of the radiation with the medium at the second wavelength A2, the directions of the electromagnetic radiation are chosen collinear, the directions of reception the measured signals of interaction of radiation with the medium are kept unchanged for all selected areas of the flame; Nala reaction medium with radiation in a third wavelength selected and Az in opposite directions and spatial distribution of the physical parameters of the flame is determined by formulej: -,

(A2) (A3) where is the physical parameter at the nth point of the section;

L - coefficient of proportionality; : Рп (Аа) - intensity of the measured signal from the n-th point at the second wavelength A2;

Pn (Az), Pp (Az) is the intensity of the measured signals from the nth point at the third AZ wavelength in the forward and opposite directions.

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

The device comprises a control unit 1, an emitter 2 with a pump source, a beam scanning system 3 including a rotating mirror 4, a stepping motor 5 and a lens 6, an object under study 7 located on one direct receiving objective lens 8 and 14, a beam splitter 9, selective element 10 at wavelength A2, radiation caused by the beneficial effect of the interaction of the probe beam and the object of study, selective elements 12 and 15 at the wavelength Az of another interaction, photodetectors 11, 13,16 with preprocessing units weaver, computer 17.

The emitter 2 is electrically connected to the control unit 1 and is optically connected to the scanning system 3, which performs the scanning of the object under study.

7 in predetermined directions. The rotary mirror 4 is installed in the focal plane of the lens 6 so that when the mirror rotates

The object 7 is irradiated by parallel beams, forming a constant angle pc with the common optical axis of the lenses 8 and 14.

The receiving objectives 8 and 14 are located on the same optical axis, along which the spatial distribution of the physical parameter, such as the concentration of molecules, of the object 7 is measured.

Photodetectors 11 and 13 and selective elements 10 and 12 are optically coupled to radiation beam splitter 9 transmitted

lens 8. The photodetector 16 and selective element 15 are located on the optical axis of the lens 14. The control unit 1 is connected to the inputs of the emitter 2 with a pumping source, a stepper motor 5, a photodetector 11, 13 and 16 and a calculator 17. The outputs of the photodetectors 11, 13 and 16 are connected with other inputs of the evaluator 17.

The method is carried out using the device as follows.

Control unit 1 starts laser 2 s.

the pump source, the radiation pulse with the wavelength AI of which, having passed through the scanning system 3, is directed to the flame region 7 to be studied. With

This rotating mirror 4 pre-installed by the stepper motor

5, according to the signal from the control unit 1, to the required angular position, directs the beam with the help of lens 6 to a given point Mi of the flame. When radiation interacts with plasma, phenomena of laser-induced fluorescence, Raman scattering, and others may occur. The result of the interaction carries information

Such parameters of the flame, such as particle concentration, and their velocity, pressure, etc., are also radiation. Part of this radiation is collected by the lens 8 and, after passing the beam splitter 9 (for example, a semitransparent plate), is selected with a selective element 10 (interference filter or monochromator) at wavelength A2 and recorded by a photoreceiver 11 with preprocessing units.

Simultaneously, the photodetector 13 through the beam splitter 9 and the selective element 12, as well as the photodetector 16 through the lens 14

and selective element 15 signals of interaction of the radiation with the medium at the wavelength Az are received. The signals from the outputs of the photodetector devices 11, 13, and 16, which include preliminary blocks (except for

Claims (1)

Claim A method for determining the spatial distribution of the physical parameters of the flame by directing electromagnetic radiation with a fixed wavelength to selected areas of the flame, measuring signals of the interaction of radiation with the medium at a second wavelength, characterized in that, in order to improve the accuracy of determination, the directions of electromagnetic radiation are chosen collinear, the receiving direction the measured signals of the interaction of radiation with the medium are kept constant for all selected areas of the flame, measured with chasing the interaction of radiation with the medium at the third wavelength and the selected opposite directions and spatial distribution of the physical parameters of the flame is determined by the formula _____ - _o / 5η = 1 · Ρη (Λ2ΧρΒ ^ Α ^), where p _p is the physical parameter in the nth estrus of the flame section; L is the coefficient of proportionality; Pn (A ₂ ) is the intensity of the measured signal from the nth point at the second wavelength Ar: Pn ^A (Az) is the intensity of the measured signal from the nth point at the third wavelength of Az in the forward direction; Pn (Az) is the intensity of the measured signal from the nth point at the third wavelength of Az in the opposite direction. Compiled by R. Agishev Editor S. Lisina Tehred M. Morgenthal Corrector ς .Cherni Order 1269 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.