Thermocouple thermometer based on MAX31856 and test method

A technology for thermocouples and thermometers, applied to thermometers, instruments, thermometers, etc. that use electric/magnetic elements that are directly sensitive to heat, to achieve the effect of facilitating work and solving nonlinear correction problems

Inactive Publication Date: 2017-06-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to avoid the deficiencies of the prior art, the present invention proposes a thermocouple thermometer and testing method based on MAX31856, which well solves the probl

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  • Thermocouple thermometer based on MAX31856 and test method
  • Thermocouple thermometer based on MAX31856 and test method
  • Thermocouple thermometer based on MAX31856 and test method

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Embodiment Construction

[0019] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0020] 1. The principle of thermocouple cold junction compensation

[0021] A closed circuit composed of two conductors A and B of different materials constitutes a thermocouple. When there is a temperature difference between the two ends of the same conductor, a current will be generated in the circuit, and an electromotive force will exist between the two ends at this time, which is called thermoelectric force. There are two hot electrodes at both ends of the thermocouple, the higher temperature end is the working end, and the lower temperature end is the cold end (free end), and the cold end is usually at a constant temperature. According to the principle of thermocouple temperature measurement, the total electromotive force generated by the thermocouple is equal to the difference between the thermal electromotive force generated by the two junctions.

[002...

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Abstract

The invention relates to a thermocouple thermometer and a test method based on MAX31856, and the latest MAX31856 released by Maxim Company is selected as the thermocouple digital converter. The MAX31856 contains a 19-bit analog-to-digital converter (ADC). The MAX31856 features an internal temperature sensor for automatic thermocouple cold-junction compensation. The MAX31856 has a temperature look-up table that supports thermocouples with different graduation numbers, and the temperature look-up table can perform nonlinear correction on the thermocouple temperature data. The invention solves the problem of thermocouple cold junction compensation and the problem of nonlinear correction of thermocouple temperature measurement. The temperature resolution of the thermometer is 0.0078125°C. Thermocouple voltage measurement accuracy is ±0.15%. The thermometer can be used portablely, and can also be connected to a computer to display data in real time, which greatly facilitates the work of engineering and technical personnel and has certain practical value.

Description

technical field [0001] The invention belongs to thermocouple thermometers, in particular to a MAX31856-based thermocouple thermometer and a testing method. Background technique [0002] Temperature is an important technical index in the process of industrial production and scientific research. Currently, platinum resistance thermometers and thermocouples are mainly used to measure temperature. The platinum resistance temperature sensor has the advantages of high measurement accuracy, good repeatability, and strong stability, but its disadvantage is that the temperature measurement response time is slow; the thermocouple temperature sensor has the advantages of simple structure, wide temperature measurement range, and relatively fast temperature measurement response time. The disadvantages are the need for cold junction compensation, slightly poor measurement accuracy, and nonlinear compensation problems in temperature measurement. This article introduces a thermocouple tem...

Claims

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Application Information

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IPC IPC(8): G01K7/02G01K7/13G01K7/14G01K7/026
CPCG01K7/02G01K7/13G01K7/14
Inventor 刘国元王莹李征
Owner NORTHWESTERN POLYTECHNICAL UNIV
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