The Circuit Design Of Pressure Sensor With Temperature Compensation Method

Pressure sensors are widely used because of a low price. The intelligent pressure sensors, based on microprocessor technique, are popularized due to convenience and accurate measurement.The sensor offset is governed by its thermal drift and time drift, so eliminating the offset thermal drift in the measurement of sensor needs to keep the values of resistance and temperature coefficient for different resistor strips to be equal each other. This paper has discussed two methods, they are hardware offset compensation and software offset compensation.Moreover, the two methds have been compared.At last, we used the software offset compensation respectively. This method makes accuracy higher, costs lower and is operated more easily. The piezoresitive coefficient of silicon is a function of temperature and so the temperature drift occurs. This paper has discussed tree methods about the temperature drift compensation, they are planar regress method,and neural network arithmetic and the method which is composed by polynominal-match method and Newton insert numerical value method. Because the third method has the merits which are higher accuracy, faster speed and lower cost, we used this method.A wireless data acquisition system for smart pressure sensor is presented in this paper, being used in some special situations for the signal collection, processing, and transmitting. It can also replace the complicated wiring in local field. Furthermore, this wireless data acquisition system for smart pressure sensor is low cost and reliable with high practicability.