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Thermocouple temperature signal acquisition method

A technology of temperature signal and acquisition method, which is applied to thermometers, thermometers, and heat measurement of directly heat-sensitive electric/magnetic elements, which can solve signal interference jitter, low signal sampling accuracy, and affect the performance of thermocouple acquisition and processing. and other issues, to achieve the effect of high signal sampling accuracy, strong anti-interference ability, and easy implementation

Inactive Publication Date: 2016-06-01
SUZHOU CHANGFENG AVIATION ELECTRONICS
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The thermocouple signal is a weak and small signal of millivolts. A little carelessness in the design of the traditional acquisition and processing circuit will cause signal interference and jitter, and various problems such as low signal sampling accuracy will seriously affect the performance of thermocouple acquisition and processing.

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  • Thermocouple temperature signal acquisition method
  • Thermocouple temperature signal acquisition method
  • Thermocouple temperature signal acquisition method

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Embodiment Construction

[0026] The invention provides a method for collecting temperature signals of thermocouples, such as figure 1 Shown is a flow chart of the present invention, which includes the following steps: the cold junction compensation step, using the cold junction bridge compensation circuit to perform cold junction compensation for the thermocouple signal, and compensating the temperature caused by the temperature change of the cold junction through the potential difference of the unbalanced bridge. The amount of thermoelectric potential change caused by it; the filtering step is to use RC low-pass filter circuit to filter the thermocouple signal to filter out the high-frequency clutter; the signal amplification step is to amplify the thermocouple signal through the operating amplifier; the acquisition step is to use A The / D converter collects the thermocouple signal and converts it into a temperature digital signal; S5 signal receiving step, the RISC embedded processor receives the tem...

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Abstract

The invention discloses a thermocouple temperature signal acquisition method. The method comprises the following steps: a cold-end bridge compensation circuit is adopted to carry out cold-end compensation on thermocouple signals; through the potential difference of an unbalanced bridge, thermal potential changes caused by changes of the cold-end temperature can be compensated; an RC low pass filter circuit is adopted to filter the thermocouple signals to filter high frequency clutters; an operational amplifier is used for amplifying the thermocouple signals; an A / D converter is adopted to acquire the thermocouple signals and the thermocouple signals are converted into temperature digital signals; and an RISC embedded processor receives the temperature digital signals. The thermocouple temperature signal acquisition method has the advantages of strong anti-interference ability, high signal sampling precision, reliability, stability and easy execution.

Description

technical field [0001] The invention relates, in particular, to a method for collecting temperature signals of thermocouples. Background technique [0002] A thermocouple is a temperature sensor that directly measures temperature and converts it into an electromotive force signal. Two homogeneous conductors of different compositions are joined together, the higher temperature end is the working end, and the lower temperature end is the cold end, and the cold end is usually at a constant temperature. According to the functional relationship between thermoelectromotive force and temperature, a standard thermocouple index table is made. The graduation table is obtained under the condition that the temperature of the cold junction is at 0°C, and different thermocouples have different graduation tables. [0003] When the thermocouple measures the temperature, it is required that the temperature of the cold end remains constant, so that the thermoelectric potential is proportion...

Claims

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Application Information

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IPC IPC(8): G01K7/02
CPCG01K7/02
Inventor 侯大勇常晨晨潘申杰李兵强
Owner SUZHOU CHANGFENG AVIATION ELECTRONICS
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