| 摘要 |
A device determines a capacitance between two electrodes. The device contains a measurement circuit disposed downstream of the electrodes to determine the capacitance between the two electrodes, a communication unit disposed downstream of the measurement circuit, and a first antenna, connected to the communication unit, and having a coil configuration and a winding. The communication unit is configured to transmit its readings to an external data communication unit. The device further contains a second antenna having a coil configuration and a winding connected to the measurement circuit. The connections of the second antenna are connected to the electrodes, such that, when the antenna is excited with an electromagnetic alternating field, there is an alternating current on the electrodes. The measurement circuit performs a measurement of the alternating current on or flowing through the electrodes and the output of the measurement circuit is supplied to the communication unit. |
