Home – Home – Jornals – Avtometriya 2005 number 6

A diffraction method for measuring circular reflecting cylinders with large diameters (of several millimeters and more) is discussed. The distinctive feature of the method is that the diameter is measured not by a diffraction pattern from a cylinder but by processing diffraction patterns from gaps between cylinder edges and reference half planes. Hence, it is possible to achieve high sensitivity of the method for inspecting objects of large diameter. An equivalent model of forming a Fraunhofer diffraction pattern by the object measured is developed and used as a base for a measurement information processing algorithm to determine diameters of objects.

Methods for increasing the accuracy of the Fresnel measurement method with the use of partially coherent light are investigated. The systematic measurement error caused by interfering diffraction edges of an object is estimated. An algorithm for decreasing the lower measurement range of the method and increasing the accuracy in this range is proposed.

A non-contact optoelectronic method for complex inspection of extended holes with diameter of more than 10 mm is analyzed. Results of experiments on measuring the nonlinearity of the axis, diameters, and the deviation of the hole shape are presented.

Mathematical and simulation models of the system to control the multiaxes laser techno- logical system LSP-2000 are developed. Different control procedures are considered. A nonlinear interpolation algorithm for a numerical control system is proposed.

A method for increasing the accuracy of triangulation measurements is analyzed. It is based on registration of the scattered radiation from two directions and implemented with the use of the second symmetric receiving channel. The action of a microprofile surface on the spatial measurement error is considered. Results of experimental analysis of the triangulation measurement error as a function of orientation of machining marks on the surface inspected are presented.

The possibility of using infrared detectors to detect defects such as through-the-thickness cracks in rail-wheel disks is considered. The proposed method is based on observing the temperature distribution evolution during metal heating by means of an infrared microbolometric camera. A through-the-thickness crack is experimentally observed in the infrared wavelength range while propagating in the wheel a heat flow initiated by an external heat source. Results of mathematical modeling of this process are in good agreement with experimental results. The possibility of developing a method to detect defects of wheels at static state is shown.

Peculiarities of using position-sensitive photodetectors in triangulation dimensional inspection systems are considered. A formula for calculating the coordinate of the center of the spot with an accuracy higher than that claimed by the producer was derived by analyzing the photodetector operation in the static mode. Problems arising in inspection of dynamic objects are considered. It is proposed to find the approximation function for determining the spot coordinate on a position-sensitive photodetector.

Different approaches to optimal reconstruction of radar surface pictures from integral observations obtained in the modes of sequential azimuthal deviation of the real beam of a radar station (RS) and to

Fault-tolerant mass-parallel computing systems with point-to-point connections are considered. The proposed paper extends studying the dependence of the embedded diagnostic circulant graph on the vertex numbering of a graph into which the embedding is performed. A graph of direct product of cyclic groups is used as the graph into which the embedding is performed (a work graph). The embedding is based on partitioning the work graph into cossets with respect to the subgroup of degrees of the chosen element. Conditions under which the structural robustness of the whole embedded graph or its fragments does not depend on the numbering are found.

Detection of signals in a seismic observation system, which appear, in particular, when a man moves over the ground surface, is considered. A mathematical model of a signal as a periodic sequence of pulses with the unknown period and with random variables, and a seismic background model having the character of a continuous Gaussian process with the unknown spectral power density are introduced. Adaptive Bayes and nonparametric detection procedures, and their digital realizations are studied. The detection characteristics are analyzed.

A method for processing images of cylindrical articles in order to improve the quality of inspection in production is described. A procedure for classifying defects by their characteristic features is proposed.

Algorithms for identifying a color of volume diffuse-scattering objects (in stomatology), primarily teeth, according to widely used colorings (color scales) are considered.

A multifunctional laser technological system for processing large-scale   mm) articles with an arbitrary surface shape is presented. It is found that the error of laser head displacement is below 10 m in any region of the working space. Engineering solutions ensure efficiency of the system without deterioration of its performance characteristics at a temperature varying from +18 up to

Creation of an information system with dynamic representation of atomic levels and transitions from information stored in the database is considered. An algorithm for constructing such a representation in the form of Grotrian diagrams is proposed. An architecture and user