Capacitively coupled electrode system for sensing voltage potentials at the surface of tissue

摘要

An electrical activity sensor for sensing and reproducing electrical potentials at the surface of a test item, such as a human being, has an electrode configured to be capacitively coupled to the test item and a detection circuit coupled to the electrode. The detection circuit compensates for capacitive coupling of the electrode. The capacitively coupled electrode and the detection circuit capacitance cooperate to mitigate a need for conductively coupling the electrode to the test subject.