Microcontroller optimization of thermal characteristic in pezoresistive MEMS pressure sensors in height measurement in fuel reservoirs

Abstract

Using a MEMS pressure sensor installed at the bottom of fuel reservoirs, one can easily find the pressure of the liquid inside the reservoir and, consequently, its height. However, due to a high SI thermal coefficient, the sensor displays different voltages at its output at different temperatures and under fixed pressure. This Article examines a digital electronic system including a MEMS pressure sensor, a temperature sensor, a microcontroller and using it to remove the effect of temperature on measuring the height of the liquid inside the reservoirs. The main advantage of using the microcontroller system is the straightforward and precise use of mathematical formulas for correction of linear and even non-linear characteristics of the sensor.