ABSOLUTE METHOD FOR DIFFERENTIAL SCANNING CONDUCTOMETRY OF DIFFERENT SOLID MATERIALS Russian patent published in 2021 - IPC G01N25/18 

FIELD: thermophysical measurements.

SUBSTANCE: invention relates to the field of thermophysical measurements and is intended to measure the thermal conductivity of dissimilar solids, the values of which are a priori unknown. The inventive method is focused on metrology and can be used as a theoretical basis for a modern standard for the unit of thermal conductivity. According to the claimed solution, a measuring cell is formed, for which a system of bodies of three samples is formed. Inside the formed system of bodies, an internal heat sink, evenly distributed over the plane of the cross-section of the samples, is placed, and on its two opposite outer planes, unidirectional and uniformly distributed over the plane of the cross-section of the samples, external sources of heat are placed. The power of the internal drain is set and it is stabilized in time, the power of external heat sources is regulated until the stationary temperature drops are equal on the samples located on opposite sides of the internal heat drain. The achieved powers and stationary equal temperature drops are measured, then the powers of external sources are equalized and the achieved stationary temperature drops are measured on samples located on opposite sides of the internal heat sink. Then, according to the measured data, the desired thermal conductivity is found by calculation.

EFFECT: invention improves accuracy of measuring the thermal conductivity of solids with a simultaneous expansion of the dynamic range and the range of investigated materials.

1 cl, 3 dwg