Capacitive Proximity Sensor As Well As Method For Capacitive Approximation Detection

摘要

A capacitive proximity sensor has a first sensor electrode and a second sensor electrode, a signal generator for providing a first and a second electric alternating signal, a first load element which comprises a first and a second electric load, in which the first alternating signal by the first load can be fed to the first sensor electrode and the second alternating signal by the second load to the second sensor electrode, and wherein the electric loads each together with the capacitive load to be measured at the respective sensor electrode form a lowpass filter, and a signal processing device, which is coupled with the first sensor electrode and with the second sensor electrode, and which is adapted to form a first measurement value from the push-pull portion of a first electric parameter tapped at the first sensor electrode and a second electric parameter tapped at the second sensor electrode.

主权项

1. Capacitive proximity sensor, comprising
a first sensor electrode and a second sensor electrode, a signal generator, for providing a first electric alternating signal and a second electric alternating signal, a first load element, which comprises a first electric load and a second electric load, in which the first electric alternating signal by means of the first electric load can be fed to the first sensor electrode and the second electric alternating signal can be fed by means of the second electric load to the second sensor electrode, and wherein the electric loads each time together with the capacitive load to be measured at the respective sensor electrode form a lowpass filter, and a signal processing device which is coupled with the first sensor electrode and with the second sensor electrode, and which is adapted to form a first measurement value from the push-pull portion of a first electric parameter tapped at the first sensor electrode and a second electric parameter tapped at the second sensor electrode.