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Automatic measuring instrument for parameter of thermoelectric material

A technology of thermoelectric materials and measuring instruments, which is applied in the field of measuring instruments, can solve problems such as difficulties in measuring thermal conductivity k, difficulty in simultaneously measuring thermoelectric materials, affecting performance characterization and application research of thermoelectric materials, etc.

Inactive Publication Date: 2011-05-11
SUN YAT SEN UNIV
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AI Technical Summary

Problems solved by technology

[0004] Conductivity s and Seebeck coefficient of thermoelectric materials S The measurement of the thermal conductivity k is relatively easy, but due to the influence of the heat radiation of the sample, the lead wire and the environment and the heat exchange between them, the measurement of the thermal conductivity k is difficult, and it is difficult to measure the electrical conductivity s of the thermoelectric material at the same time, Seebeck (Seebeck) coefficient S and thermal conductivity k, which affect the performance characterization and application research of thermoelectric materials

Method used

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  • Automatic measuring instrument for parameter of thermoelectric material
  • Automatic measuring instrument for parameter of thermoelectric material
  • Automatic measuring instrument for parameter of thermoelectric material

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] The principle structure of the present invention is as figure 1 shown.

[0023] When measuring the parameters of thermoelectric materials, select the thermal conductivity k at a certain temperature SD Known thermoelectric materials whose performance is similar to that of the sample to be tested are made into a standard sample with the same size as the sample to be tested. After the precision DC constant current power supply 9 is powered off for a period of time, the temperature difference between the two ends of the sample 17 tends to change linearly, and the rate of change of the temperature difference (d T / d t ) is proportional to the thermal conductivity k of sample 17, k= k *(d T / d t ), where the proportionality factor k From the rate of change of the temperature difference of the standard sample (d T / d t ) SD =k SD / k inferred.

[0024] Th...

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Abstract

The invention provides an automatic measuring instrument for the parameters of a thermoelectric material, which comprises a vacuum testing system and a computer control system, wherein the vacuum testing system comprises a mechanical pump, a vacuum cover, a low-temperature constant-temperature tank, a furnace body, a thermal coupler, a temperature controller, a sample supporter, an alternating-current power supply and a direct-current power supply, and the computer control system comprises a control circuit, an analog-to-digital multifunctional card and a computer system. The automatic measuring instrument can be used for automatically measuring the electrical conductivity s, the Seebeck coefficient S and the thermal conductivity k of the thermoelectric material at each temperature point within the temperature range of -30 to 800 DEG C according to selected temperature intervals so as to obtain the value of a quality factor ZT (wherein Z= S2s / k) of the thermoelectric material at absolute temperature T.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to an automatic measuring instrument for thermoelectric material parameters. technical background [0002] Thermoelectric materials, also known as thermoelectric semiconductor materials, can realize the direct conversion between heat energy and electric energy. n type and p The electric refrigeration system or thermal power generation system composed of thermoelectric junctions of thermoelectric materials has the characteristics of small size, light weight, no transmission parts, noiseless operation, easy maintenance, no pollution, stable performance, and long life. [0003] A good thermoelectric material must have a high Seebeck coefficient S , so as to ensure a more obvious thermoelectric effect. At the same time, there should be a low thermal conductivity k, so that the heat can be kept near the joint. In addition, the electrical conductivity s is required to be large, so that the gene...

Claims

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Application Information

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IPC IPC(8): G01N25/00G01N25/20G01N25/18
Inventor 林国淙刘晖丁喜冬张进修
Owner SUN YAT SEN UNIV
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