Високоточний компаратор теплопровідності для визначення малих відхилень теплопровідності взірців твердих матеріалів

Abstract

Наведено теоретичні основи побудови компаратора для визначення відхилень теплопровідності взірців твердих матеріалів на основі зрівноваженої мостової теплової вимірювальної схеми, наводиться опис принципової схеми розробленого компаратора та результати експериментальних досліджень. The development of modern science and industry is largely associated with the emergence of new, artificially created materials for which thermal conductivity is a certified option. Devices for testing the materials in Ukraine were established. In addition, the actual problem is the transmission unit size of the thermal conductivity of national primary standards for working standards. This creates great difficulties both in terms of implementation materials testing and metrological support in these measurements. In the article the theoretical bases of the comparator to determine the thermal conductivity of small deviations of the thermal conductivity of solid material models based on balanced bridge circuit heat are described. The structural scheme of the developed comparator shows the method of choosing optimal parameters for comparator elements by the criterion of maximum sensitivity of the circuit. Building a comparator to determine the thermal conductivity of small deviations of the thermal conductivity of solid material models based on balanced bridge thermal measuring system allows to improve significantly the accuracy of small deviations of the thermal conductivity of different models, in particular - the same size and made of the same material as compared to other known schemes for reducing the impact of different uninformative parameters.