M. S. Kravchenko

Bio: M. S. Kravchenko is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Observatory & Reflector (antenna). The author has an hindex of 1, co-authored 4 publications receiving 6 citations.

Development of Telecentric Objectives for Dimensional Inspection Systems

Abstract: Features of designing objectives telecentric in the object space are discussed. The optical layout of three telecentric objectives developed for dimensional inspection systems using the shadow projection method is presented. A method for monitoring the quality of manufacture of such objectives having small distortion (less than 0.02 %) and small non-telecentricity (less than 0.01°) is described. Comparison of experimentally obtained optical characteristics of two objectives manufactured by us and one objective manufactured by the Thorlabs company (U.S.) is carried out.

Control and Positioning System for Reflector of ‘‘Millimetron’’ Observatory: Design and Development

Abstract: We propose a method to control the multi-element mirror system of the telescope of the space observatory ‘‘Millimetron’’ under its tuning taking place after the opening on the orbit. For the preliminary control of the location of reflector elements, the laser rangefinder is used; for the final control, the optical method of the Foucault knife is used. We compute the optical scheme of the control system for the final tuning of the telescope and present it. We show simulation results for images obtained under deviations of reflector elements. We present computation results for the optical system, implementing the Foucault knife method.

Application of diffractive elements for improving the efficiency of systems for cylindrical surface inspection

Abstract: An improved method of structural lighting for increasing the efficiency of inspection of the cylindrical object surface appearance is considered. The method is based on using a diffractive optical element to reduce the amount of recorded data due to illuminating the test object at an angle to the image recording plane, which is normal to the inspected surface. Implementation of the proposed method implies the use of several identical channels. For this reason, one channel is considered in the present study. Calculations of diffractive elements, a description of the experimental setup, and results of experiments aimed at determining the depth of surface defects on objects simulating fuel pellets and fuel elements are presented. Implementation of the investigated method with defect depth determination in industrial systems of inspection of fuel pellets and fuel elements is expected to improve the quality of the fuel for atomic power stations.

Control and Positioning System for Reflector of ‘‘Millimetron’’ Observatory: Design and Development

Abstract: We propose a method to control the multi-element mirror system of the telescope of the space observatory ‘‘Millimetron’’ under its tuning taking place after the opening on the orbit. For the preliminary control of the location of reflector elements, the laser rangefinder is used; for the final control, the optical method of the Foucault knife is used. We compute the optical scheme of the control system for the final tuning of the telescope and present it. We show simulation results for images obtained under deviations of reflector elements. We present computation results for the optical system, implementing the Foucault knife method.

Light Section Method of Alignment Control for Weapon Barrels

Abstract: Basing on the structural lighting method, we develop a contactless system of the alignment control for weapon barrels. We propose and design a construction of a compact optical sound using a diffraction optical element to expose the barrel bore. We provide processing algorithms for images obtained under the scanning of the barrel bore; then, using these algorithms, we restore the 3 $$D$$ -shape of the controlled item and compute the required geometric parameters. We provide test results of the alignment control system on samples of real products.

Development of a straightness inspection system of the rifled guns channels

Abstract: The article discusses the development of a non-contact straightness inspection system of the rifled guns channels based on the structured light method. A compact optical probe has been developed, in which a diffractive optical element (DOE) is used to illuminate the bore. Algorithms for processing a series of images obtained by scanning a bore are proposed and developed. In the issue of image processing 3D form of the controlled product is reconstructed. The test results of the straightness inspection system on real samples are presented. As a result of the tests, the error of measurements of straightness deviations at the level of ± 4 microns was obtained.