RU1791709C - Device for measuring image angle of rotation of telescopic system - Google Patents

Abstract

Usage: geodetic instrumentation, optical instrumentation when setting up telescopic systems. SUMMARY OF THE INVENTION: the device comprises optically coupled forming an optical system with a illuminator, a condenser, a lens and a slit diaphragm located in its front focal plane, and a receiving optical system with a lens and an analyzer located in its rear focal plane and made in parallel positions - band-sensitive receivers symmetrically located relative to the optical axis of the lens of the receiving optical system, as well as the installation site of a controlled telescopic system and the processing unit is electrically connected to the analyzer. 4 ill.

Description

with C

The invention relates to the field of geodetic instrumentation and is intended for measuring the slope of images from telescopic systems containing specular and prism angles.

. A device for measuring the tilt of an image is known, which contains a light source, a condenser, a collimator, in the front focal plane of the lens of which a grid is installed in the form of a vertical dash or cross, and on the other side of the controlled system is a telescope with a grid in the focal plane of the eyepiece, graduated in an angular least.

The disadvantages of this technical solution are low productivity of the operator, insufficient accuracy of determining the angle of inclination

images, subjectivity of the results.

The aim of the invention is to increase accuracy.

Figures 1 and 2 show a general diagram of a device for monitoring telescopic systems of direct and broken types, respectively.

In FIG. Figures 3 and 4 show the field of view of the analyzers.

The device consists of a light source 1. of a condenser 2, a collimator consisting of a lens 3, in the front focal plane of which a slit aperture 4 is installed, and a receiving optical system consisting of a lens 5, two lines of position-sensitive photodetectors 6 and 7 , information processing unit 8, display unit 9, and digital printing unit 10. When

|

Yu

 about

H)

This controlled telescopic system can be a direct image with a lens 11, a prism wrapping unit 12 and an eyepiece 13, as well as a broken or periscopic type with a lens 14, mirrors 15.16 and an eyepiece 17 ;,. The device operates as follows /. . The light source 1 by means of a condenser 2 illuminates the narrow slit of the diaphragm A of the collimator. The lens 3 of the collimator forms a beam of parallel rays. In the absence of a controlled system, the lens 5 of the receiving optical system constructs an image of the slit in the plane of the photodetectors 6 and 7. The image of the slit should be projected onto the photodetectors so that the signals removed from them are compensated, i.e., equal to zero, which corresponds to the case of no tilt image - initial position (Fig. 3). When installing a controlled system with a prism or mirror unit, due to an error in the installation of prisms and mirrors, the image of the slit rotates around the optical axis of the system (tilt). In this case, the image of the collimator slit, constructed in the plane of the photodetectors, will be rotated relative to its initial position (Fig. 3) by some angle a, the image of the slit on the photodetectors is shifted from the position corresponding to the zero signal, and the photodetectors generate electrical signals proportional to this bias. In this case, the signals will have different signs. The absolute mutual displacement of the slit image in the plane of the photodetectors is determined as follows

B- (Ui / n / 02 /) y

where / Ui / and / 1) 2 / are the signals from the photodetectors 9 and 10 modulo;

(p-positional sensitivity of photodetectors.

Then the slope of the slit image can be determined by the formula

tg -a-b ("AND-AND Uz

... -Eh

where a is the distance between the photodetectors. Or

"Arctg (lUil + IU2JJ

(I Ui I -H U2 I) p

p

Since the quantities p, a and p are known in advance, we can write

a (/ Ui / + / U2 /) K

where K is the coefficient characterizing. ...

specific device.

Similarly, measurements are taken during the monitoring of systems of a different type for which the tilt produces the effect of shifting the image of the slit (Fig. 4).

All calculations are performed in the information processing unit 8.9 and 10 and are displayed on the digital display of the display unit.

Claims (1)

Thus, when using the proposed device, subjectivity in estimating the amount of image tilt is completely eliminated. The measurement process is fully automated. The time of one measurement depends only on the speed of the electronic units and will be about 5-10 s. The measurement error of the calculated data is of the order of 10. SUMMARY OF THE INVENTION A device for determining an angle of rotation of an image of a telescopic system comprising optically coupled forming an optical system with a lens and a test object located in its front focal plane, and a receiving optical system with a lens and an analyzer located in its rear focal plane, as well as an installation unit for a controlled telescopic system located between the lenses of the receiving and transmitting optical systems, characterized in that, in order to to increase accuracy, the test object is completed in the form of a slit diaphragm, and the analyzer in the form of parallel rulers of position-sensitive receivers, symmetrically located relative to the optical axis of the lens of the receiving optical system and connected to the input processing unit. Figure 1 FIG. 2 fig.Z FIG. 4