Capacitive Sensing System With Differential Pairs

A capacitive sensing system comprising two or more capacitive sensors (30a, 30b), one or more AC power sources (306a, 306b) for energizing the capacitive sensors, and a signal processing circuit for processing signals from the sensors. The sensors are arranged in pairs, wherein the one or more AC power sources are arranged to energize a first sensor of a pair of the sensors with an alternating current (307) or voltage 180 degrees out of phase to a current or voltage for a second sensor of the pair of sensors, and wherein a pair of the sensors provides a measuring unit for a single measured distance value, the signal processing circuit receiving an output signal from each sensor of the pair and generating a measured value related to the average distance between the sensors of the pair and the target (9). 本发明提供种电容式感测系统，包括两个或更多个电容式传感器(30a、30b)、用于供电给该电容式传感器的个或多个AC电源(306a、306b)、以及用于处理来自传感器的信号的信号处理电路。这些传感器被布置成对，其中个或多个AC电源被配置成以交流电流(307)或电压供电给对传感器中的第传感器，该交流电流或电压与供给该对传感器中的第二传感器的电流或电压相位相差180度，且其中对传感器提供针对单测量距离数值的测量单元，该信