E.V. Astashova - Head of scientific and technical board, JSC «Concern «Sozvezdie»
P.N. Kucherin - Senior Research Scientist, state scientifically - research test institute of problems of technical information security federal service of technical and export control of Russia
A.V. Lopin - Post-graduate Student, the Voronezh State Technical University
V.I. Lopin - Ph.D. (Eng.), Associate Professor, Deputy Chief in the state scientifically - research test institute of problems of technical information security federal service of technical and export control of Russia
O.Y. Makarov - Dr.Sci. (Eng.), Professor, Voronezh State Technical University
A.V. Muratov - Dr.Sci. (Eng.), Professor, Voronezh State Technical University

Recently even more often innovative methods of diagnostics of the radio-electronic elements began to be applied, allowing to estimate reliability characteristics of tens at short periods, hundreds, and sometimes and thousand elements. One of such ways is the thermovision method of diagnostics consisting in registration of infrared radiation of a radio-electronic element with the good spatial and temperature permission. The registered infrared radiation of a radio-electronic element rather precisely reflects its thermal mode and allows to judge its reliability characteristics. Thus a special role at the solution of a problem of an assessment of reliability characteristics of radio-electronic elements reliable definition of their thermal modes, as a rule, being characterized value of the thermodynamic temperature reflecting a power condition of an element is. Generally the power condition of a radio-electronic element (object) registered by thermovision means, is characterized by the effective thermal (infrared) radiation which consists from two component: own and rereflected radiation caused by background radiation. Thus the size of effective thermal radiation of object is defined by a power condition of object, a power condition of an irradiating background and optical characteristics of a surface of object. It should be noted that optical characteristics of a surface of object can make very essential change to formation of its effective infrared radiation besides a power condition and an irradiating background and by that to bring false to idea of a thermal mode of the object received by means of thermovision means. In most cases real objects represent bodies of a difficult form which, as a rule, contain cavities (deepening) that is at the bottom of change of optical characteristics of a surface, and, therefore, and changes of size of effective (total) infrared radiation of object. As exit from this situation carrying out calculations of values of thermodynamic (true) temperatures of object received on the basis of the measured values of effective infrared radiation (radiation temperatures of object taken values) and corrected taking into account optical characteristics of a surface around an arrangement of cavities (deepening) can serve. The accounting of optical characteristics of a surface can be carried out by introduction in settlement a ratio of effective coefficient of the thermal radiation considering radiating properties of cavities on a surface of object. Besides, receiving reliable information about true value of thermodynamic temperature of object around a cavity requires the solution of the return task directed on receiving a calculated value of thermodynamic temperature of object, on the basis of its effective infrared radiation measured value which is defined by the measured value of radiation temperature by means of thermovision means.

 

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