Patent ID: 9588162
Date: 2017-03-07
CPC Classifications: G01R,G01V

Claim:
1. A locating appliance for capacitive detection of an object enclosed in a medium, comprising: a measurement electrode; a reference electrode; a reception electrode, the measurement electrode and the reception electrode configured to form a measurement capacitance that is influenced by the object, and the reference electrode and the reception electrode configured to form a reference capacitance that is influenced by the object, the measurement capacitance being more sensitive to the object than the reference capacitance; an oscillator connected to the measurement electrode and the reference electrode, the oscillator configured to supply the measurement electrode and the reference electrode with phase-shifted AC voltages; and a control device connected to the reception electrode, the control device configured to control amplitudes of at least one of the AC voltages in order to match influences of electrical fields from the measurement electrode and the reference electrode on the reception electrode to one another, the control being performed based on a signal received from the reception electrode, wherein the measurement electrode, the reference electrode, and the reception electrode are in two-dimensional form, and wherein the measurement electrode has a greater area content than the reference electrode.