A Method of Improving the Accuracy of Measuring the Seebeck Coefficient of Thermoelectric Materials

A technology of thermoelectric materials and coefficients, applied in the measurement of electricity, measurement of electric variables, measurement devices, etc., can solve the problems of thermoelectric conversion efficiency error, inability to meet the quantitative analysis of material physical properties, low measurement accuracy, etc., to ensure accuracy and precision, The method is effective and easy to implement, and the measurement accuracy is high.

Inactive Publication Date: 2017-01-11
SHANDONG UNIV
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Problems solved by technology

However, the current high-temperature Seebeck coefficient measurement accuracy is not high, which cannot meet the requirements for quantitative analysis of material properties, and also brings certain errors to the evaluation of thermoelectric conversion efficiency.

Method used

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  • A Method of Improving the Accuracy of Measuring the Seebeck Coefficient of Thermoelectric Materials
  • A Method of Improving the Accuracy of Measuring the Seebeck Coefficient of Thermoelectric Materials
  • A Method of Improving the Accuracy of Measuring the Seebeck Coefficient of Thermoelectric Materials

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Embodiment 1

[0049] A method for improving the accuracy of measuring the Seebeck coefficient of thermoelectric materials,

[0050] —Temperature measurement stage: fix three Cernox resistance thermometers on the outer screen 7 of the vacuum, platform A4, and platform B5 where the thermoelectric material is placed, respectively, using thermally conductive glue. These three resistance thermometers are external screen thermometer 1, platform A thermometer 2 and platform B Thermometer 3. The three resistance thermometers are respectively connected to an ARRAY M3500A six-and-a-half-digit multimeter, and the resistance is measured by the four-wire method. The current source provides a controllable constant current for the thermoelectric material. Due to the large internal resistance of the voltmeter, the voltage flowing The current of the meter is ignored, so the reading of the voltmeter divided by the current value is the resistance of the thermoelectric material. Under the condition that the res...

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Abstract

Disclosed is a method for increasing measured seebeck coefficient accuracy of a thermoelectric material. The resistance of electrical resistance thermometers is measured by a four-wire method, lead resistance is effectively eliminated, reading accuracy of the electrical resistance thermometers can be guaranteed, the temperature control accuracy is increased through a PID temperature control algorithm, temperatures of two ends of the thermoelectric material can be accurately adjusted to a required numerical value, according to a temperature backward method, the influence of parasitic potential on a measuring result can be eliminated, and the measured seebeck coefficient accuracy can be guaranteed. According to the method for increasing the measured seebeck coefficient accuracy of the thermoelectric material, measuring accuracy is guaranteed in a series of measuring steps of measuring the temperature of the thermoelectric material, changing the temperature values of the two ends of the thermoelectric material, eliminating the parasitic potential and the like, and the method for increasing the measured seebeck coefficient accuracy of the thermoelectric material is effective, easy to implement and significant to application occasions with high requirements for the seebeck coefficient accuracy.

Description

technical field [0001] The invention relates to a method for improving the accuracy of measuring the Seebeck coefficient of thermoelectric materials, belonging to the technical field of electrical testing and measurement. Background technique [0002] The thermoelectric effect, also known as the Seebeck effect, is a kind of effect of mutual conversion between electricity and heat, which is closely related to the properties of the Fermi surface of materials, and is of great significance in the study of physical properties; the thermoelectric effect can be applied to Thermoelectric power generation and semiconductor refrigeration, therefore, have attracted extensive attention from scientific researchers. However, the current high-temperature Seebeck coefficient measurement accuracy is not high, which cannot meet the requirements of quantitative analysis of material properties, and also brings certain errors to the evaluation of thermoelectric conversion efficiency. By systema...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01N25/00
Inventor 刘剑赵明磊李茂奎王震李宜
Owner SHANDONG UNIV
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