Temperature Drift Characteristics And Compensation Algorithm Of Silicon Thermal Wind Sensor

Meteorological monitoring is closely related to people's daily life,and has a pivotal position in agricultural production,industrial development,transportation,environmental protection,military operations,aerospace and many other aspects.Wind speed monitoring is an important part of meteorological monitoring,the traditional wind speed monitoring method is mainly through the mechanical measurement equipment.In recent years,the rapid development of integrated circuits makes the traditional mechanical wind speed wind direction measuring instrument began to the direction of intelligent and integrated development.The research of this paper is a two-dimensional thermal wind speed sensor based on MEMS technology.Because of its use of thermal element as sensor detection and control element,there is a certain temperature drift phenomenon.This paper presents a solution to the wind drift problem of wind speed sensor.In this paper,the control circuit of the wind speed sensor is analyzed and found that the main reason for the phenomenon of sensor temperature drift is that the control circuit itself can not achieve the theoretical constant temperature difference control when the ambient temperature changes,resulting in the sensor when the external environment temperature changes its output Voltage is affected.For this,in this paper,a hardware circuit compensation scheme is introduced.The theoretical calculation of the input terminal voltage of the amplifier shows that the resistance and temperature diode coefficient on the Wheatstone bridge need to satisfy certain formula to make the ambient temperature has no effect on the input voltage of the amplifier.By measuring the temperature coefficient of diode,the resistance value of the Wheatstone bridge is adjusted.Finally,the sensor is tested under the condition of variable temperature and the experimental data are obtained.Proved that the hardware circuit compensation can optimize the temperature drift of the sensor.This paper not only introduces the hardware circuit compensation method to compensate the temperature drift of the sensor,but also through the software algorithm program to optimize the temperature drift of the sensor to optimize and compensate,the main way is through analysis found that the control sensor chip heating Voltage and the ambient temperature have a certain linear relationship,and then in the software algorithm calibration of the heating voltage with temperature changes in the coefficient,and finally in the actual work of the sensor by the translation of the heating voltage operation makes the use of heating voltage to calculate the wind speed.In the wind tunnel in the fixed wind speed,temperature changes under the conditions of the sensor temperature drift test.The test results showed that the change in wind speed is about 1 m/s when the temperature changes from 0? to 35?.It is proved that the compensation scheme of the software algorithm can compensate the temperature drift of the sensor effectively.In this paper,the temperature drift problem of wind speed sensor is studied,and the temperature drift problem of the sensor is optimized by modifying the control circuit of the sensor and the temperature compensation of the software algorithm,so that the working performance of the wind speed sensor is Improve,to lay the foundation for its realization of product.