Mykytyn I. Measuring of temperature by noise methods. Theory and practice

Dissertation is devoted to development and use of noise thermometers for a recreation and transmission of thermodynamics temperature scale. It was expounded the actuality of problem, grounded advantages of noise method of measuring of temperature. Basic problems which arise up during planning of facilities of measuring of noise thermometry are considered. Investigational sources of error of methods of measuring to the square of mean value of noise voltage, proportional to the measurable temperature and expression is shown out for a maximum error each of methods. For the improvement of metrology descriptions of noise thermometers it is suggested to carry the operations of multiplying and integration of noise signals in digital part, to conduct filtration of noise signals with the help of digital filters on the basis of transformation of Fourier and to use transformers with the as possible less the temperature coefficient of resistance. It was formed basic conceptions of creation of intellectual filters on the basis of transformation of Fourier. It was experimentally confirmed the correctness of the offered mathematical models of entrance circle of noise thermometer, method of estimation of maximum error of measuring of temperature, method of filtration of noise signals on the basis of transformation of Fourier, theoretical ground of level of limitation of spectral components of noise signal and use of histogram of spectrum as a criterion of estimation of quality of the filtration. It was realized methods and the algorithms of functioning of noise thermometers, which are utilize integration after frequency and time.