Dzikovska Y. Normative and technical support for measurements of thermal field temperature distribution of objects in industry and medicine

The thesis is devoted to improving the normative and technical support of temperature and temperature gradient measurements of objects' thermal field in industry and medicine. The review of thermal imagers as a means for a research of thermal field of objects' surface by infrared radiation is conducted, their constructive features are reviewed, generalized extended classification of thermal imagers is proposed. The analysis of thermal imagers usage in industry and medical research for temperature and temperature gradient measurements of objects' surface is performed, common problems of thermal imagers usage in industry and medicine are identified, their solutions are formed. The main factors which lead to low infrared radiation temperature and temperature gradient measurement accuracy are considered, existing methods and ways of its increasing are analyzed, their advantages and disadvantages are specified. Analysis of thermal imagers calibration in calibration laboratories and their functioning in operating conditions, of normative support of temperature and temperature gradient measurement for objects of industry and medicine are conducted. Sources of thermal imaging research uncertainty are reviewed. The need to improving the normative and technical support for measurement of temperature distribution of objects' thermal field in industry and medicine are determined. Estimation methodology for uncertainty of temperature and temperature gradient measurement of object's surface that allows to assess the impact of various factors on different types and components of uncertainty is developed. By the analysis and evaluation of uncertainty for infrared radiation temperature and temperature gradient measurement, this methodology allows to propose measures for its reducing. Analytical expressions of sensitivity coefficients of factors influence that determine the value of output signal in working conditions are obtained. Infrared radiation temperature and temperature gradient measurement method on principle "band in band" and methodology of thermal imager "in-situ" calibration by using extended area gray emitter are offered. They provide a significant reduction of methodological uncertainty by taking into account the effect on the temperature and temperature gradient measurement emissivity of the researched object, the transmission of intermediate medium and reflection of background radiation. The analysis of choosing of specific wavelengths values for spectral bands on the principle "band in band" is performed and possible ways to implement two-bands temperature measurement are discussed. Requirements to extended area gray emitter are formed and its design variants for different objects and conditions are proposed. Methodology of buildings heat losses determination and their monetary evaluation on the results of thermal imaging research is developed. This allows to determine the heat losses increase in monetary equivalent and to assess the recoupment of work to eliminate these sources of heat losses. The project of standard "Methodology of buildings thermal imaging research" is developed. Recommendations for a medical thermal imaging research are formed. The program of personal training in the field of non-destructive control on thermal method is proposed. It is aimed to improve the staff qualification of thermal imaging laboratory and to reduce the uncertainty of thermal imaging research resulting from incorrect measurements, incorrect analysis of the results or non-use of methods for improving the accuracy of infrared radiation temperature and temperature gradient measurements.