Temperature measuring method and circuit adopting reference voltage compensation technology

A technology of reference voltage and reference voltage source, applied in the direction of using electric devices, thermometers using electric/magnetic elements directly sensitive to heat, using electromagnetic means, etc., can solve the problems of voltage value drift, affecting temperature measurement accuracy, etc., to achieve Easy to modify, improve temperature measurement accuracy, easy to achieve effects

Inactive Publication Date: 2017-05-17
BEIJING AEROSPACE AUTOMATIC CONTROL RES INST
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  • Abstract
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Problems solved by technology

Among them, the voltage value output by the reference voltage source will drift with the change of external temperature. This temperature error is more prominent in high-precision temperature measurement occasions, which greatly affects the temperature measurement accuracy.

Method used

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  • Temperature measuring method and circuit adopting reference voltage compensation technology
  • Temperature measuring method and circuit adopting reference voltage compensation technology
  • Temperature measuring method and circuit adopting reference voltage compensation technology

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Embodiment Construction

[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many of the details listed in the specification are only for readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0049] The temperature measurement method and temperature measurement circuit using the reference voltage compensation technology in this embodiment are mainly done by performing error compensation on the output value of the reference voltage when using platinum resistance thermometers for temperature measurement, so as to ensure that the reference voltage is as high as possible during the calculation process. Accurate, thus improving the temperature measurement a...

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Abstract

The invention discloses a temperature measuring method and circuit adopting the reference voltage compensation technology. The method is characterized in that a reference voltage source supplies power for a platinum resistor temperature measuring bridge while the temperature of the reference voltage source is measured through a digital temperature measuring sensor attached to the surface of the reference voltage source, and the temperature is transmitted to a FPGA chip; the platinum resistor temperature measuring bridge converts the measured temperature into voltage change, and the voltage change sequentially passes a filter circuit, an operation amplifier and an A / D conversion module and is input into the FPGA chip; the FPGA chip performs the error compensation and calculation of the measured temperature according to the temperature error calibration model of the reference voltage source and the nonlinear calibration model of a platinum resistor so as to output the digital quantity of the measured temperature. The method has the advantages that error compensation is performed on the output value of reference voltage, the reference voltage is kept accurate as much as possible during the calculation, and temperature measuring precision is increased to a large degree.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a temperature measurement method and a temperature measurement circuit using a reference voltage compensation technology. Background technique [0002] Platinum resistance thermometers occupy an important position in the field of temperature measurement due to their advantages such as wide temperature measurement range, high precision, good stability, high reproducibility of indication value and oxidation resistance. In order to reduce the influence of lead wire resistance on the temperature measurement accuracy of platinum resistance thermometers, a bridge circuit design is generally used. The principle is: use a reference voltage source to provide a voltage excitation for the bridge circuit, and the bridge circuit converts the reference voltage into a measurement voltage that changes with the resistance of the platinum resistance, and obtains the measured value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/18
CPCG01K7/18
Inventor 张潇杜建邦谭新洪刘晴晴任磊王浩周璐路静聂琦邵春江马相亮赵鹏飞卓超
Owner BEIJING AEROSPACE AUTOMATIC CONTROL RES INST
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