RU1347689C - Method of remote measuring of initial value of focal distance of refraction channels - Google Patents

Abstract

The invention relates to the field of measuring parameters of optical radiation, in particular refractive channels. The goal is to increase the accuracy of measuring the initial value of the focal length of refraction ropes, fishing. The method involves directing two beams of laser radiation into the refraction channel, one along its optical axis and the other near it, inside the paraximal region. Both beams are taken with a focusing lens and the distance between the obtained images is measured behind it, according to which the desired parameter is judged. By sending simultaneously two spherical collectible beams, the distorting influence of the linear component can be eliminated. The parameters of the beams can be either the same or different 2 il. i (Л bo 42 а 00 о

Description

(The reading refers to the region of measuring optical emission parameters, in particular refractive channels, and can be used to remotely determine the initial value of the focal length of refractive channels.

The aim of the invention is to increase the accuracy of measuring the initial value of the focal length of refractive channels.

Figure 1 shows a block diagram of a device implementing this method on collimated laser beams; Fig. 2 is the same for diverging laser beams.

In the first case, the method is implemented

10

Kmii of the probe probe (C) F., GDR, D is the wavelength of the probe radiation in vacuum; a is the initial radius of the probe beam), propagating at an angle cf (,) to the optical axis of the asymmetric refraction channel at L F, the offset 1 of the image of the probe radiation source in the transverse direction in the image plane of the focusing lens is

1., 1.

1 „LS

5

4- - F - C

 h- (4 0) 2

where I (image bias due to the linear component of the average permittivity (it is the same as for

beam propagating in the optically following manner. A bunch of optical 7P ".,

. channel axis, and at an angle f

radiation from laser 1 (source of zones -.

.To her) ;

Radiation) through the collimator for 2 hours, splitter 3 is sprinkled on

L is the distance from the source of the zones, other radiation to the photodetector

optical axis 4 refraction canal

5, and the other part of the radiation beam from splitter 3 is simultaneously sent to the refraction channel at an angle После. After passing the distance L, both beams after the interference filter 6 tuned to the wavelength of the probe radiation source (laser 1) reach the focusing lens for 7 s focal length Fjji, Behind the lens in the image plane 8, the distance l1 between the images of the probe beams is measured by a diopter tube 9 with a scale. The magnitude of the distance d1 judges the initial value of the focal length of the refractive channel.

In the second case (Fig. 2), the beam of optical radiation from the laser 1 is divided into two beams by a beam splitter 3. One beam shrink along the optical axis k of the refraction channel 5. Another beam after reflection from the mirror 10, which is p from the optical axis 4 of the refraction channel 5. simultaneously with the first

 at

send to the refractive channel. Both beams pass through the interference filter 6 and are received by a focusing lens 7 and in the image plane 8 by a diopter tube 9 with a scale, the distance l1 is measured by the images of the probe beams. According to the magnitude of the distance, the court on the initial value of the focal length of the refractive channel. Dp shfogo

Kmii of the probe probe (C) F., GDR, D is the wavelength of the probe radiation in vacuum; a is the initial radius of the probe beam), propagating at an angle cf (,) to the optical axis of the asymmetric refraction channel at L F, the offset 1 of the image of the probe radiation source in the transverse direction in the image plane of the focusing lens is:

1., 1.

1 „LS

4- - F - C

 h- (4 0) 2

where I (image bias due to the linear component of the average permittivity (it is the same as for

L is the distance from the source of the zones of direct radiation to the photodetector;

d is the diameter of the refractive channel;

F is the initial value of the focal length of the refractive channel;

F is the focal length of the focusing lens.

Thus, by sprinkling simultaneously two broad collimated beams (one along the optical axis of the refraction channel and the other at an angle Ч to it), one can get rid of the distorting influence of the linear component

- i i -ic / orKF / From here it is easy to obtain the following relation:

.-.

by which the desired parameter is determined when using wide collimated beams for sounding.

In the event that the radiation of a diverging probe beam propagates in the refraction channel

(ka j, “L) from a point remote from the optical axis of the refraction channel by a distance p (the magnitude of the displacement of the image will be determined by the ratio:

5V

() fx | gr.

Therefore, sending simultaneously two diverging probe beams

radiation (one source should be located on the optical axis of the refraction channel, and the other at a distance from it), you can get

L

from

1-1Ро-1 (.. о) -Рг | / Ро

The beam parameters (wavelengths D and initial radii d) can be the same or different. The fact that the probe radiation is incident along and around the optical axis of the channel, i.e. within the paraximal region avoids distortion.

Claims (1)

The claims A method for remotely measuring the initial value of the focal distance of refraction channels by sending a laser beam into the channel along its optical axis, receiving a predetermined radiation distance by a focusing lens, which consists in sending the first to send the measurement accuracy simultaneously with the first optionally a second laser beam inside the paraximal region refractive channel, take it with the same lens and measure the distance between the images behind the lens, which is used to judge the desired parameter. Fig, 1 . 4 , fi .7 Fi.g