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Realization of temperature compensation of cold junction of thermocouple based on temperature field fitting method

A cold junction temperature compensation, thermocouple technology, applied in thermometers, thermometers with directly sensitive electrical/magnetic components, and heat measurement, can solve problems such as cost increase and achieve cost-saving effects

Active Publication Date: 2010-09-29
大连爱智控制系统有限公司
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  • Application Information

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Problems solved by technology

However, the conventional method is to use a temperature sensor as compensation for one thermocouple measurement channel. In this way, the cost of the product will increase significantly with the increase of the thermocouple measurement channel.

Method used

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  • Realization of temperature compensation of cold junction of thermocouple based on temperature field fitting method
  • Realization of temperature compensation of cold junction of thermocouple based on temperature field fitting method
  • Realization of temperature compensation of cold junction of thermocouple based on temperature field fitting method

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Embodiment Construction

[0031] According to the method in the technical scheme, an instrument with eight thermocouple signal inputs is selected to verify the method. Its eight analog input channels AI0~AI7, such as figure 2 and image 3 As shown, take the actual cold junction temperature points of 0A / 0B, 4A / 4B and 7A / 7B, use the PT100 sensor to measure the temperature at three points, and paste the temperature compensation sensor on the terminal. In actual use, the factors that affect the temperature distribution of each channel can be divided into three types. From the installation position of the instrument, they are located on the left, right and middle of other equipment, such as Figure 4 , Figure 5 and Image 6 From the perspective of ambient temperature, it is 16°C to 40°C; from the perspective of air flow, there are external fans with good air flow and no fan with poor air flow. Place the DUT of the instrument to be tested under three conditions, connect the thermocouple, and place the ...

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Abstract

The invention provides a method for realizing the temperature compensation of a cold junction of a thermocouple by a temperature field fitting method, which comprises the steps of: establishing a mathematical model of temperature distribution on a plane determined by three points only through a distribution change discipline of the temperature of the three points, wherein the independent variableis the known temperature of the three points, and a function value is a temperature value of any point on the rectangular plane determined by taking the three points as vertexes; processing experimental data by a method of least squares to solve the undetermined coefficient of the model; and realizing the temperature compensation of thermocouples of all channels on the plane by measuring the temperature of the three points.

Description

technical field [0001] The invention belongs to the field of temperature detection instrument design, and provides a method for realizing temperature compensation of the cold end of a thermocouple based on a temperature field fitting method. Background technique [0002] Common thermocouple cold junction compensation methods include bridge method, freezing point method and high-precision temperature sensor compensation method. In comparison, the use of high-precision temperature sensor compensation has the advantages of high precision and good stability. However, the conventional method is to use a temperature sensor as compensation for one thermocouple measurement channel, so the cost of the product will increase significantly with the increase of thermocouple measurement channels. SUMMARY OF THE INVENTION [0003] In view of the above problems, the present invention proposes a method of temperature field fitting to realize the temperature compensation of the cold juncti...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/12
Inventor 仲崇权王鹤王占猛袁晓峰
Owner 大连爱智控制系统有限公司