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Error correcting method for pressure sensor

A pressure sensor and error correction technology, applied in the direction of measuring fluid pressure, instruments, measuring devices, etc., can solve the problems of cumbersome adjustment process, fixed adjustment temperature area, low production efficiency, etc., and achieve a simple and efficient correction method Effect

Inactive Publication Date: 2007-12-19
KUNSHAN SHUANGQIAO SENSOR MEASUREMENT CONTROLLING
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AI Technical Summary

Problems solved by technology

This method is mature, but has the following disadvantages: 1. The trimming process is cumbersome; 2. Only one sensor can be trimmed at a time, and the production efficiency is low; 3. The trimming temperature zone is fixed, and only a specific The temperature zone is adjusted, and the adjustment effect is unsatisfactory
4. It can only be adjusted once. During use, when the zero position drifts over time, it cannot be corrected again

Method used

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  • Error correcting method for pressure sensor
  • Error correcting method for pressure sensor
  • Error correcting method for pressure sensor

Examples

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Effect test

example 1

[0043] Example 1: The sensor raw sampling data matrix is ​​as follows:

[0044] According to the test characteristics of the sensor, the compensation temperature zone of the sensor is decomposed into a sub-temperature zone every 15°C, a total of 9 sub-temperature zones.

[0045] (2) Calculate and correct the pressure sensor error compensation coefficient in the temperature zone

[0046] 1. According to the decomposed sensor output data of each sub-correction temperature zone, use the MATLAB self-built fitting program, and use the quadratic item fitting method to calculate the correction coefficients of the sensor.

[0047] Example of coefficient calculation process:

[0048] The output data of the sensor shown in Example 1 at -40°C is:

[0049] 3762

[0050] The expected output value is:

[0051] 0

[0052] Use the polyfit function that comes with MATLAB to calculate the two nonlinear correction parameters k3 and k4 (polyfit(X, Y, 2)).

[0053] Simi...

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Abstract

A method for correcting error of pressure transducer includes setting up data model of pressure transducer, collecting N numbers of different temperatures and M numbers of output values from pressure transducer to form N x M transducer data matrix, setting up pressure transducer model according to output data, dividing temperature compensation region to be a numbers of revision temperature regions, detailing pressure transducer model to calculate out compensation coefficient, obtaining transducer output value according to revision formula and using microprocessor to fetch value in storage space of revision coefficient.

Description

technical field [0001] The invention relates to a method for correcting the error of a pressure sensor, which is the application of modern advanced signal processing technology in the field of pressure sensors, and is beneficial to improving the output characteristics of the pressure sensor. Background technique [0002] Pressure sensor is a commonly used measurement device in engineering. Due to the influence of temperature and manufacturing process itself, its output characteristics will shift, resulting in inaccurate measurement results. The most important ones are nonlinearity, zero position and sensitivity temperature drift, and zero position time. Drift three errors. [0003] Traditional pressure sensor error correction methods mainly include: series and parallel resistors, thermistor network, resistor laser trimming and other methods. The trimming principles of these methods are basically the same. Carry out trimming to achieve consistent bridge resistance characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L19/04G01L19/00
Inventor 吴如兆王文襄王冰杨成王善慈李水侠
Owner KUNSHAN SHUANGQIAO SENSOR MEASUREMENT CONTROLLING
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