Method and device for calibrating a pressure sensor

Abstract

The invention discloses a method and a device for calibrating a pressure sensor. The method comprises the steps of establishing an original data table according to corresponding test temperature values and corresponding test pressure values of a pressure sensor to be calibrated at set temperature points and set pressure points, and storing the original data table; selecting a plurality of groups of test temperature values and test pressure values from the original data table according to a use temperature zone and a pressure range to act as calibration data; acquiring a calibration equation according to the calibration data; and carrying out pressure calibration on a current environment temperature and an original pressure output value of the pressure sensor to be calibrated according to the calibration equation, and acquiring a calibrated pressure output value. According to the invention, the calibration equation does not need to be stored in advance, and users can select corresponding calibration data and establish a corresponding calibration equation according to performance requirements of the pressure sensor. Compared with traditional technologies, the technical scheme disclosed by the invention has high flexibility, and is good in calibration precision and conducive to secondary development of the pressure sensor.

Description

technical field [0001] The invention relates to the technical field of sensor calibration, in particular to a method and device for calibrating a pressure sensor. Background technique [0002] Existing pressure sensors perform temperature calibration before the product leaves the factory, store the calibration equation parameters in the memory, call the calibration equation parameters when the user uses them, and output the original pressure data after calculation. [0003] The temperature calibration of the above-mentioned existing pressure sensors has at least the following disadvantages: [0004] Since the existing pressure sensor has stored the calibration equation parameters in the memory before leaving the factory, the user cannot change the calibration equation when using the pressure sensor, resulting in a fixed form of the calibration equation and low flexibility, which is not conducive to the special requirements of pressure sensor application developers. applicat...

AI Technical Summary

Problems solved by technology

[0004] Since the existing pressure sensor has stored the calibration equation parameters in the memory before leaving the factory, the user cannot change the calibration equation when using the pressure sensor, resulting in a fixed form of the calibration equation and low flexibility, which is not conducive to the special requirements of pressure sensor application developers. application

For example, a pressure sensor with a working temperature range of -20°C to 70°C, if the calibration equation is calculated at -20°C, 25°C, and 70°C, the sensor will be at 0°C or 50°C or The accuracy of other temperature points is poor. When the application development needs to use the 0°C point, there will be a large deviation, which will affect the accuracy.

Images