Measurement system and measurement method for rapidly measuring thermoelectrical potential

Abstract

The invention provides a measurement system for rapidly measuring thermoelectrical potential. The system mainly comprises a sample table provided with a first supporting copper block and a second supporting copper block, a temperature measurement and control module provided with a temperature controller, a first temperature sensor, a second temperature sensor, a first heating block and a second heating block, a thermoelectrical potential measurement module provided with a nanovoltmeter, and a data processing module provided with an A / D (Analogue to Digital) conversion device, a data transmission bus and a data processing unit. The invention further provides a measurement method for rapidly measuring thermoelectrical potential by using the measurement system. Compared with the prior art, according to the measurement system and the measurement method for rapidly measuring the thermoelectrical potential provided by the invention, the thermoelectrical potential of the test sample can be quickly, conveniently and rapidly measured without operations such as gold-plating treatment on the surface of the sample to be measured and welding, and roughness and evenness on the surface of the sample to be measured are not strictly required, and the error is smaller when the sample to be measured with smaller thermoelectrical potential is measured.

Description

Technical field [0001] The invention relates to the technical field of thermoelectric potential measurement, and in particular to a measuring system and a measuring method capable of quickly measuring thermoelectric potential. Background technique [0002] The generation mechanism of thermoelectric potential is that when there is a temperature gradient at both ends of the material, the non-uniformity of the temperature leads to the asymmetric distribution of electrons in the system, thereby generating a potential difference at both ends of the material. The so-called thermoelectric potential is also the Seebeck coefficient, which is defined as the ratio of the potential difference ΔV caused by the temperature difference ΔT at both ends of the sample to the temperature difference ΔT, that is, the thermoelectric potential S=ΔV / ΔT, which is a Physical quantities related to material properties. The thermoelectric potential is a basic property of materials, which will change only whe...

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Problems solved by technology

[0008] 2. The surface of the required sample needs to be very smooth;

[0009] 3. In order to reduce the measurement error, the greater the difference between the thermoelectric potentials of the two materials connected, the better. At the same time, because these two different thermoelectric potential materials play the role of wires, metals are generally used, but the thermoelectric potentials of metals are small. Therefore, it increases the difficulty of reducing errors in actual measurement;

[0010] 4. Although this method does not need to measure the actual temperature difference, the stabilization of the temperature is a slow process, so a temperature control device is still required to ensure the stability of the temperature gradient for measurement;

[0011] 5. The wiring of this method is more complicated

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