An autonomous calibration method for pressure sensors

Abstract

The invention belongs to the technical field of measurement and testing and relates to a method for automatic calibration of a pressure sensor. The method can be used for solving the problem of measurement accuracy instability caused by zero drift, sensitivity drift, gain deviation and device parameter instability and the like. The method mainly comprises a first step of using a standard high-precision calibration device to calibrate a new pressure sensor; a second step of obtaining characteristic values of the pressure sensor along with time changes under specific pressure, a third step of constructing characteristic value sequences for representing the intrinsic change law of the pressure sensor, a fourth step of performing one-time accumulation generation treatment on the characteristic value sequences, a fifth step of constructing a first-order differential equation of every characteristic value sequence and a sixth step of establishing a calibration line of a new working period of the pressure sensor. According to the method, no hardware device needs arranging, and calibration precision is high; automation of the calibration process of the sensor is achieved, and the method is particularly suitable for places where manual calibration of the sensor cannot be performed.

Description

technical field [0001] The invention belongs to the technical field of measurement and testing, and relates to an autonomous calibration method of a pressure sensor, which can be used to overcome the problem of unstable measurement accuracy of the pressure sensor caused by zero point drift, sensitivity drift, gain deviation, and unstable device parameters during use. . Background technique [0002] Pressure sensors are widely used in industrial production, especially in aerospace delivery systems, manned aerospace engineering systems, remote sensing measurement and military systems. Due to the complex and changeable environment, the pressure sensors used in these fields need to work continuously and for a long time, and the long-term stability of the sensors is greatly restricted. In aerospace delivery systems and manned aerospace engineering systems, especially in long-running and non-returnable aerospace measurement and control devices such as deep space probes, due to te...

AI Technical Summary

Problems solved by technology

[0009] The technical problem of the present invention is: to overcome the deficiencies of the existing calibration technology of the pressure sensor, provide a new method of self-calibration of the pressure sensor, add the control algorithm of the self-calibration method of the present invention into the control program, greatly improve and improve the slow change The stability and accuracy of the pressure sensor in the environment, the use of the present invention can replace the tedious regular replacement and re-inspection calibration work of long-running linear and nonlinear pressure sensors

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