Igor A. Konyakhin

Three-coordinate digital autocollimator

Studies have been carried out to determine the characteristics of a three-coordinate digital autocollimator under laboratory conditions. The results of the studies confirmed that the proposed autocollimator can efficiently determine the angular strains of large objects of the type of the primary mirror of a radio telescope.

Research of autocollimating angular deformation measurement system for large-size objects control

Characteristics of the system were studied in laboratory conditions. The research confirmed effectiveness of the considered angular deformation measurement system for large-size objects such as the primary mirror of a radio telescope.

Optic-electronic systems for measurement the three-dimension angular deformation of axles at the millimeter wave range radiotelescope

Researches in the millimetre wave range require the high accuracy for position of the mirror components of the radiotelescope. A mirror weight is the cause of the three-dimension angular deformation of the elevation axle and azimuth axle relatively bearings. At result the elevation angle and azimuth angle of a parabolic mirror axis orientation is not equal to the set values. For the measuring roll, pitch and yaw angular deformations the autocollimation system with new type of the reflector are used. Reflector for autocollimation measurements as compositions of the anamorphic prism and special tetrahedral reflector is described. New methods for roll, pitch, yaw angles measuring are discussed. Optical scheme for the measurement system, structure the anamorphic prism and tetrahedral reflector are proposed. Equations for the static characteristic of the measuring system are shown.

Iterative algorithm for determining the coordinates of the images of point radiators

This paper proposes an iterative algorithm for determining the coordinates of the image of a point radiator, based on successive refinement of the image-localization region. An algorithm is investigated, using a mathematical model. It is established that the algorithm can be adapted to the image size and that the image-localization region is independent of the initial estimate.

Three-axis optic-electronic autocollimation system for the inspection of large-scale objects

Ways of refining autocollimation systems for the inspection of angular deformation of industrial objects are analyzed. Control elements based on tetrahedral reflectors with plane and cylinder reflecting sides are researched. Results of an analysis the action matrix of tetrahedral reflectors are considered. The features of tetrahedral reflector as the control elements for three-axis angular systems are discussed. Equations for static characteristics of the measuring system are shown.

Optic-electronic autocollimation sensor for measurement of the three-axisangular deformation of industry objects

Ways of improving autocollimation sensors for monitoring angular displacements are analyzed. The results of an analysis of control elements based on tetrahedral reflectors with flat and cone reflecting sides are presented. The technical characteristics of experimental models of control elements are presented. The features of tetrahedral reflector as the control elements for three-axis angular sensors are discussed.

Determination of parameters and research autoreflection scheme to measurement errors relative position of the optical elements of the Space Telescope

The main advantages and disadvantages of using autoreflection and autocollimation schemes for constructing the measuring channel, which is designed to control the relative position of the elements of the optical system Space Telescope are described in this paper. Results of modeling in the Zemax software complex are given. Methods of determining the autocollimation images coordinates for calculate the error relative position of the optical system are described.

The experimental research of the systems for measuring the angle rotations and line shifts of the large aperture radio-telescope components

The main mirror construction of the radiotelescope for the millimetre wave range requires to measure the line deformation of mirrors surface and shifts of the secondary mirror relatively main mirror. There is a necessity to construct the new radio-telescope RT-70 Suffa (Russia). The 3-D parabola main mirror of this radio telescope has a diameter 70 meters, and the elliptical secondary mirror with the diameter 3 meters are placed on the distance 21 meter relatively main mirror. Following issues dealing with this problem are described in this article: 1) the possibility of the design of deformation measurement system based on triangular method 2) the new scheme of optic-electronic measurement system. The great attention during the research was paid to the experimental approval of the theoretical results. The experimental setup of the described system had the following characteristics: infrared emission diode AL107B by power 15 mWt as sources of radiation; the objective by the focal length 450 mm as aperture of receiver video-camera, the CMOS matrix receiver by type OV05620 Color CMOS QSXGA with 2592*1944 pixels and one pixel size (2.2*2.2) μm2 produced OmniVision as image analyzer . The computer simulation error and the experimental error measurement was 0.1 mm at the

Study of the influence of the tetrahedral reflectors properties on autocollimating systems characteristics

Improving of the autocollimating systems characteristics is a line of optical engineering development. It is associated with study of initial errors and ways of their reduction. Study is devoted to the influence of tetrahedral reflectors properties (errors of dihedral angles) on the characteristics (accuracy et al) of autocollimating and autoreflection opticalelectronic systems for positioning control. The MATLAB mathematical model of tetrahedral reflector was developed for these purposes; results of simulation were compared with Zemax simulation. It is important to notice that the process of image formation is quite complex, it explains by superposition of six reflected and deflected beams. Because of the dihedral angle errors six compound images separate or overlap; that causes the redistribution of energy and image becomes complicated for processing. The aim is to study the influence of reflector properties on position of the image energy center, because it defines the measurement error. The influence of the tetrahedral reflector properties on systems characteristics is shown by example of shift control system based on autoreflection scheme.

Optic-electronic sensor for measuring the deformations of the axle at the radio-telescope

The improved autocollimation sensors for measuring angular deformations of the large constructions as elevation axle and the azimuth columns of the radio telescopes are analyzed. Two new types of the reflector for autocollimation sensors are researched. The first type of the reflector is the composition of the anamorphic prism and ordinary cube-corner retroreflector. This reflector generates the narrow beam, as result the work distance and the range of measurement of the sensor increases. The second type of the reflectors is the tetrahedral reflector with flat reflecting sides and invariant axis. For this reflector the small value of the conversion coefficient is the realization of the measurements on the large work distances. The technical characteristics of the experimental setups of new reflectors are presented. The features of the anamorphic prism and tetrahedral reflector as the reflectors for autocollimation angular sensors are discussed.