Temperature Characteristics and Compensation Method of Capacitive Ice Layer Thickness Sensor

摘要

When there're clear changes in environmental temperature, the electrode itself of the capacitive ice layer thickness sensor also varies and its capacitance changes, causing mistakes in determining the ice/snow-air interface with the electrode. Based on analysis on relation between electrode capacitance and temperature changes, a differential temperature compensation circuit composed by a thermistor is designed in this paper. Experiments indicate that the electrode voltage is less influenced by temperature changes after adding the compensating circuit, improving the accuracy of the sensor.