SU1580999A1 - Optical method of measuring a focal distance of refraction channels - Google Patents

Abstract

The invention relates to the technical physics. And, in particular, to the measurement of the characteristics of the reflection channels. The aim of the invention is to determine the accuracy of measuring the focal distance of an asymmetrical aberration refraction channel. The Yang of this sends a flat collimated laser beam of radiation from the source along the optical axis of the pf image channel. At the same time, it is oriented in such a way that the larger side of the bridge is perpendicular to the direction of movement of the medium. The scattered radiation is received from the windward side of the channel and the sought-for parameter FO is determined by the formula F0 Lc / 1.99, where T and p is the distance from the scattering point of reception to the source. 1 il. 5s

Description

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with.

The invention relates to technical physics, in particular, to the measurement of parameters of optical radiation 1, and can be used to determine the focal distance of an asymmetric refraction channel with aberrations, i.e. high-intensity optical radiation generated in a medium moving across the beam.

The aim of the invention is to increase the accuracy of measuring the focal length of an asymmetric aberration refraction channel.

The drawing shows a block diagram of a device for carrying out the proposed method.

The method is as follows.

Sprinkle a flat collimated probe laser beam at a frequency different from the frequency of the Radiation creating a refraction channel in the medium along the optical axis of the refraction channel and receive the probe beam radiation scattered from the channel outside the refraction channel (at its edge. Determining the direction of motion of the medium ( on the windward side of the refraction channel), place the receiver of the radiation scattered from the channel from the windward stopons and increase the width of the probe beam until a sharp increase in the intensity the scattered radiation of the scattered radiation along the refraction channel to find the position at which the maximum intensity of the recorded SL is observed

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about with to to with

which is determined by -JlkJ JW% - 4 f- J p

coma parameter F according to the formula РЛшТ, р /

radiation s and measure the distance from the point of sending of the probe beam to the point of reception of the maximum intensity value b of the recorded radiation,

steam

/ 1.99,

where F0 is the focal distance of the refraction channel, 1 The determination of the windward side of the refraction channel can be carried out as follows

The plane of the probe beam and the receiver of scattered radiation turn around the optical axis of the refraction channel until the scattering radiation of the probe beam goes out of the refractive channel and not from two sides, but from one side only. This side 2 will be the windward side of the refraction channel. Other methods are possible for determining the windward side of the refraction channel, for example, using an instrument that measures the direction of movement of the slit.

It has been established that with the propagation of a laser beam of a drel shape along the optical axis of a symmetrical р ° fractional channel with an aberration, the maximum intensity of the laser beam emanating from the rocking beam from the wind side can not be viewed from the lee side. This laser beam will not be observed. If Bolashag. Toron gap, uchke terpenikul rsh direction dvtsenil environment, the maximum z-scaler intensity scattered from the radiation channel is observed strictly on the windward side with Let, 99F0 at the edge of the channel. At other orientations of the click beam, the pattern of the probe radiation scattered from the channel is spread out in space.

The device uses the following sequence: 1 installed probe radiation source 1 (laser), collimator 1 and a variable snapping diaphragm 3, Vbl 31 - edge of the refraction cable and a photo receiver L located on a mobile 5P platform connected to the bridge

6 management of the site / s mixing photographic 4 Usteoistgo contains also the drive 8 through the aperture of the diaphragm 3 and the scale of the number of measures measured from the point of reception-absorbed

five

0

five

five

radiation to the point of sending the probe beam.

The device works as follows. Laser radiation from the source 1 through the collimator 2 with a variable slit diaphragm 3 is sent to the refraction channel 10 along its optical axis. After passing a certain oasis in the refraction channel, the probing laser beam leaves the channel and is received by the photodetector 4, which is on the moving platform 5. Aperture 3 increases the diameter of the probing laser beam until the signal from the photodetector 4 starts to grow rapidly, then the control unit 6 turns on the actuator 7 that rotates the photodetector And around the optical axis of the diffraction channel, it moves the photodetector 4 along the channel and the actuator 8, which rotates the diaphragm 3, until the maximum signal from the photodetector A is obtained. Then, with the help of scale 9, the distance L from the source of the probing laser beam to the point reception and according to the formula F6 1 / 1.99 trial t about the required parameter

Also, the accuracy rtOMpnenvR of the desired parameter is obtained.

Form / ha and ooreteii

OSHIC-RJ 1 method And meorney of the focal petb of the iyin channel, after which the laser beam is transmitted to the laser radiation on a frequent basis, from agitote and 1, which creates a radar channel in the side, on the optical axis of the refraction channel of the scattered reception from the radiation channel of the probe beam outside the refraction channel at its edge, increasing the probe probe width, until the delivery of a jump in the intensity of the register-divergent scattering radiation. being located along the south of the south dripped, psgolzi points of maximton int ° chgiznosti register of ergO1 about L 3inruei ich s in the distance Lp to i the frame of the probe / sensory nv-i + dispatch with the required parameter, about tl and , and 41 - w and ii with heme, h IH in tiichki tochiois 13 Erchmt oioi v stand by the scaling of a -1 ion refraction rn, with i

51580999 $

The flat probing beam, the plane from the channel, the radiation with its pressure perpendicular to the direction of the side, and the desired parameter Fa of the motion of the medium, are taken scattered by the formula F0 C / 1.99,

Claims (1)

Claim An optical method for measuring the focal length of refraction channels by sprinkling a collimated probe laser beam at a frequency different from the frequency of the radiation creating the refraction channel in the medium along the optical axis of the refraction channel, receiving the probe beam scattered from the radiation channel outside the refraction channel at its edge, increasing the width of the probe beam until a jump in the intensity of the recorded scattered radiation is reached, and the position of the maxi the maximum value of the intensity of the detected radiation, according to the distance Ep to which from the sending point of the probe beam judges the desired parameter, about the head. and with the fact that, d. whole increases in the accuracy of measuring the focal length of an asymmetric aC. 5 1580999 6 flat probe beam, the plane of the radiation channel from the windward channel of which is perpendicular to the direction of the side, and the desired parameter F _{a is the} medium’s displacement, and the scattered beam is taken according to the formula = Lp / 1.99.