Nonlinear calibrating method for multiple temperature points of pressure sensor

Abstract

The invention relates to the relevant technical field of pressure characteristic value acquisition of pressure sensors, in particular to a method and a system for acquiring a pressure characteristic value of a pressure sensor with a nonlinear temperature compensation algorithm. The method includes the steps: sampling the pressure characteristic value of the pressure sensor to obtain a pressure characteristic value D; calculating a temperature drift correction coefficient delta t related with the outside temperature according to the outside temperature; and calculating a corrected value D+delta Dt of the pressure characteristic value. The sensor is calibrated by an upper computer, the upper computer makes a data sheet according to a series of data measured at different temperatures and under different pressures in calibration as the upper computer can execute large-scale computation, a calculating parameter for calculating the pressure value can be rapidly found in an EEProm (electrically erasable programmable read only memory) sheet according to signals measured by a temperature sensor and the pressure sensor when a lower computer is used for measurement, and an accurate pressure value is obtained by calculating. As the temperature drift correction coefficient is added, acquisition accuracy of the pressure characteristic value is remarkably and particularly improved by the aid of a one-step compensation method in a high-temperature area and a low-temperature area.

Description

technical field [0001] The invention relates to the technical field related to the collection of pressure characteristic values ​​of pressure sensors, in particular to a method and system for converting pressure characteristic values ​​of pressure sensors into pressure values ​​with a nonlinear temperature compensation algorithm. Background technique [0002] Most pressure sensor manufacturers now provide pressure sensors with resistance network compensation. This sensor has the characteristics of stable performance, simple circuit design, and convenient use. However, this sensor cannot meet the requirements of high precision and high consistency due to the limitations of the manufacturing process due to the resistance network, and the accuracy generally only meets about 1%. [0003] Although some sensors use software compensation, because of the imperfect calculation method, the accuracy can only reach 5‰, while the algorithm described in the patent of the present invention...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a pressure sensor pressure characteristic value acquisition method and system with a nonlinear temperature compensation algorithm to solve the pressure characteristics caused by the imperfect algorithm or the rough production of the compensation circuit in the pressure sensor detection system in the prior art. Technical problem with inaccurate value sampling accuracy

Images