Nonlinear calibrating method for multiple temperature points of pressure sensor
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.