Method and apparatus for measuring the heat capacity of a solid good conductor over a temperature range from low temperatures to room temperature

Abstract

The application relates to a solid conductor low-temperature to room-temperature variable-temperature specific heat measurement method and device, which comprises a solid conductor ball provided with a through hole in the diameter direction, a heating element arranged at the center of the through hole, a first temperature measurement element arranged at the center of the ball to measure the center temperature of the ball, a second temperature measurement element arranged outside the ball to measure the ambient temperature, a temperature difference measurement element to measure the temperature difference between the ambient and the surface of the ball, a container to store low-temperature medium, a position adjusting mechanism to adjust the height of the ball in the container, a heating control circuit to realize periodic heating, and a data acquisition and processing device to collect the temperature, the temperature difference and the heating parameters in real time. The method adopts a periodic square wave heating signal to heat the sample, the natural temperature rising process before and after heating is linearly fitted to estimate the temperature increment through the temperature extension method, and the specific heat capacity is calculated according to the heat released by the heating element, the temperature increment of the sample and the physical property parameters. The application does not need heat preservation or heat insulation measures, realizes continuous measurement in a wide temperature range, has high measurement precision and simple device structure.

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