Device , Sensor Arrangement and Method for the Capacitive Position Finding of a Target Object
First Claim
14. Method for capacitive position finding of a target object, in which a plurality of capacitive probes (20, 30, 40) is arranged over a detection area (16) in which a position of the target object (12) is to be determined, characterized in that the probe voltages are dependent on the spacing of the target object from the given probe and are evaluated for determining the position of the target object, that the probes (20, 30, 40) are in each case supplied with a supply voltage across coupling capacitances (22, 32 42), capacitive voltage dividers with the probe voltages as mean voltages being formed through the coupling capacitances (22, 32, 42) and by the capacitances (24, 34, 44) of probes (20, 30, 40) to the environment varying as a result of a position change of the target object (12) to be detected and that the probe voltages are processed with an evaluating device (50) to an output signal, which is a measure of the position of the target object (12) to be found.
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Abstract
The present invention relates to a device for capacitive position finding of an object, with a plurality of capacitive probes distributed over an area in which a position of the object is to be established. According to the invention the device is characterized in that the probes are in each case connected by means of coupling capacitances to a voltage source and can be supplied with a supply voltage and that an evaluating device connected to the probes is provided permitting the processing of the probe signals to an output signal, which is a measure for the position of the object to be established. In further aspects the invention relates to a probe/sensor arrangement and a method for capacitive position finding of an object.
33 Citations
18 Claims
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14. Method for capacitive position finding of a target object, in which a plurality of capacitive probes (20, 30, 40) is arranged over a detection area (16) in which a position of the target object (12) is to be determined,
characterized in that the probe voltages are dependent on the spacing of the target object from the given probe and are evaluated for determining the position of the target object, that the probes (20, 30, 40) are in each case supplied with a supply voltage across coupling capacitances (22, 32 42), capacitive voltage dividers with the probe voltages as mean voltages being formed through the coupling capacitances (22, 32, 42) and by the capacitances (24, 34, 44) of probes (20, 30, 40) to the environment varying as a result of a position change of the target object (12) to be detected and that the probe voltages are processed with an evaluating device (50) to an output signal, which is a measure of the position of the target object (12) to be found.
Specification