Calibration method of pressure sensor based on mc8051

A pressure sensor and calibration method technology, which is applied in the calibration/testing of force/torque/power measuring instruments, measuring fluid pressure, instruments, etc., can solve problems such as low accuracy of curve and surface fitting, unstable network, and a large number of samples

Active Publication Date: 2019-08-09
FUZHOU UNIV
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Problems solved by technology

[0004] At present, software algorithm compensation methods mainly include curve-surface fitting method and neural network method. The accuracy of curve-surface fitting is not high, and the biggest disadvantage of the mainstream neural network method is that the network is unstable, and requires a large number of samples, and the training time is too long.

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  • Calibration method of pressure sensor based on mc8051
  • Calibration method of pressure sensor based on mc8051
  • Calibration method of pressure sensor based on mc8051

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Embodiment Construction

[0026] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0027] A kind of pressure sensor calibration algorithm based on 8051 of the present invention, comprises the following steps,

[0028] Step S1: Select the pressure sensor, preset n temperature values ​​and m pressure values, where the n temperature values ​​are respectively t 0 , t 1 , t 2 , t 3 , t 4 , t 5 , t 0 ~t 2 is the low normal temperature section, t 2 ~t 5 for the high temperature section;

[0029] Step S2: Fix the temperature value unchanged, carry out the pressure sensor test, and perform polynomial fitting on the pressure value P and the output voltage u to obtain the P-U function p n = f n (u);

[0030] Step S3: Test the pressure sensor in the low normal temperature section and the high temperature section respectively, and perform the following treatments respectively;

[0031] (1) Under the low normal temperatu...

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Abstract

The invention relates to a pressure sensor calibration algorithm based on 8051. Based on the least square fitting,the Newton difference value and the cubic spline interpolation algorithm, the calibration algorithm for effectively eliminating the temperature drift is achieved. Especially for pressure sensor calibration which often needs to work at different temperatures, the calibration error is within 0.119 percent, and the cost, hardware computing power and operating speed are fully taken into account. The pressure sensor calibration algorithm based on 8051 has some practical engineering application value.

Description

technical field [0001] The invention relates to an 8051-based pressure sensor calibration algorithm. Background technique [0002] The pressure sensor is the most commonly used sensor in real life, and it is widely used in various fields such as industrial control, automotive electronics, and medical equipment. However, due to the physical characteristics of the semiconductor material of the sensor, it is greatly affected by the temperature, and there will be obvious drift of zero point and sensitivity, especially in the high temperature range, so the temperature compensation of the pressure sensor must be carried out as much as possible. Reduce or even eliminate the influence of temperature drift on it. [0003] At present, the commonly used compensation methods are mainly hardware circuit compensation and software algorithm compensation. The hardware circuit compensation methods mainly include the method of connecting appropriate constant resistances in series and paralle...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L27/00G01L25/00
CPCG01L25/00G01L27/005
Inventor 魏榕山刘欢吴志强
Owner FUZHOU UNIV
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