An automatic measurement device for thermal conductivity based on thermoelectric semiconductors

Abstract

The invention provides thermal conductivity coefficient measurement equipment based on a thermoelectric semiconductor. The thermal conductivity coefficient measurement equipment comprises a sample tube, a sample tube support and a controller, wherein the sample tube comprises a heat insulation sleeve, a heating device, a first temperature sensor, a second temperature sensor, the thermoelectric semiconductor and a potential measurement device; the heat insulation sleeve is made of a heat insulation material and is of a hollow cylindrical structure; one end of the heat insulation sleeve is closed, and the other end of the heat insulation sleeve is opened; the heat insulation sleeve is fixed on the sample tube support and is used for accommodating the heating device, a sample and the thermoelectric semiconductor. According to the equipment, the thermoelectric semiconductor is adopted for measuring heat passing through the sample, a temperature stabilizing process is automatically controlled through proportion integration differentiation (PID), errors caused by multi-point temperature measurement are reduced, the temperature stabilizing process is accelerated, and thermal conductivity coefficients of a material at different temperatures can be measured.

Description

technical field [0001] The invention relates to the field of measuring thermal conductivity of materials, in particular to a device for automatically measuring thermal conductivity of materials by using a thermoelectric semiconductor and a PID control system. Background technique [0002] The thermal conductivity of materials is an important characteristic of materials and plays an important role in engineering design. Its application fields are quite extensive, and it is indispensable in petroleum, chemical industry, material and military industry. [0003] At present, there are two methods for measuring the thermal conductivity of materials: steady-state method and unsteady-state method. Measurements based on the steady-state method include the heat flow meter method and the guarded hot plate method. Non-steady-state measurements include hot wire method, tropical method and constant power heat source method. [0004] The steady-state method means that the heat flux thro...

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Problems solved by technology

[0005] However, in the prior art, multi-point temperature measurement is used to determine the heat passing through the material. The results measured in this way are not accurate, and the temperature stabilization cannot be quickly achieved in the prior art.

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