Slavkov V. Development of digital photographic method of thermal control metals at high temperatures

The object of research - the formation processes, registration and processing of the surface temperature field of metal objects of various compositions and dimensions as a result of high temperature heating. The aim of research is the development of method TC metals using a digital camera as a detector of thermal radiation in the visible range of the spectrum and algorithms construction of digital image processing of temperature fields of control objects that are at temperatures above 600 °C. Methods of research: induction heating of metals, photometry, colorimetry, brightness pyrometry, calorimetry, methods of digital signal processing and computer programming in environments LabView and MathCAD, basics of functional analysis. Theoretical and practical results: it have been developed software algorithms for digital image processing, that allowed: to perform a digital camera calibration brightness temperature in the range of 500 ... 1800 °C and set the calibration curve; carry out heat control of metal plates, the bulk metal samples and determine presence of defects; solve additional tasks of thermal control of metals. Scientific novelty: the first to use the digital camera as a means of fixing the temperature field at the TC metals, as a result have been installed the temperature differentials on the metal surface. It has been developed a mathematical model of thermal processes, it can solve the task of placing a certain number of identical parameters of heaters. An improved method for calibrating a digital camera in the spectrum visible range of thermal radiation using as a working etalon is the radiator, type of absolute blackbody. The further developed methods for the determination of metals heat capacity and emissivity coefficient their surface. The realization degree: digital photographic method of thermal control of metals at high temperatures implemented in the company "Production Association Alloy 500" (Kharkov) and LLC "TT" (Kharkov). The results obtained in the thesis have been used in the forging and heat production of "Novokramatorsky Machine-Building Plant" (Kramatorsk) and the learning process of faculty "Information and measuring technologies and systems" NTU "KhPI" in the preparation of laboratory practical and methodological support. The branches of this research application are metallurgy and machine-building, thermal nondestructive testing, Research Studies Institutes and a training process.