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Capacitive proximity sensor

A capacitive proximity sensor uses a single plate capacitive proximity detector. Capacitive proximity sensors may include one or more electrical conductors formed along the leading edge of a moveable panel, as well as a capacitance sensitive circuit (e.g., a bridge circuit or an oscillator) coupled to the conductor. Systems using capacitive proximity sensors typically measure the capacitance of a sensing electrode with respect to its environment as an object being sensed moves in relation to the electrode. An obstacle in proximity to the conductor changes the capacitance of the sensor, which change is thereafter detected by the capacitive sensitive circuit. Typically, the sensing electrode is connected to an alternating current or radio frequency (RF) source and the current to the electrode is monitored to detect such capacitance changes. Capacitive proximity sensors are widely used in various applications. For example, capacitive proximity sensors are used in place of pushbutton switches in keyboards and control panels, as limit switches in various kinds of equipment, to detect the flow of dry and liquid materials in pipes and to detect motion of objects relative to each other.

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