Remotely powered cooperative sensor device

A sensor for potential and/or impedance measurements on a body, comprising a master and at least one remotely powered sensor connected to the master;

• the master comprising a receiver and a power supply configured to supply an alternating power voltage to said at least one remotely powered sensor;
• each of said at least one remotely powered sensor comprising a control circuit including a first sensor fork sub-circuit configured to supply a positive current to a first circuit branch and a negative current to a second circuit branch;
• each of said at least one remotely powered sensor further comprising an electrode and being configured to perform the potential and/or impedance measurements when the electrode is in contact with the body;
• the control circuit further comprising a control sub-circuit configured for controlling the positive and/or negative current in order to transmit an information signal to the receiver, and/or to control a first controlled signal to a first desired signal;
• wherein the control circuit is further configured to control the positive and/or negative current at a control frequency band corresponding to a range of frequencies used for the potential and/or impedance measurements;
• each of said at least one remotely powered sensor further comprising a first electrical connection and a second electrical connection connecting each of said at least one remotely powered sensor to the master, each of said at least one remotely powered sensor being powered via the first and second electrical connections;
• wherein the power supply is configured to supply the alternating power voltage at a powering frequency band;
• wherein the control circuit is configured for harvesting energy from the alternating power voltage to power each of said at least one remotely powered sensor;
• and
• wherein the first sensor fork sub-circuit comprises two diodes or transistors, the first electrical connection connecting the first sensor fork sub-circuit to the master at a node between the two diodes or transistors.