Sensing system for monitoring a predetermined space

摘要

A sensing system (10) for monitoring a predetermined space comprises a control unit, one or more antenna electrodes (14) connected to the control unit and an autonomous modulator (12). At least one of the antenna electrodes (14) is operable as an emitter antenna electrode for emitting RF excitation signals into the space to be monitored and at least one of the antenna electrodes is operable as a receiver antenna electrode for receiving RF response signals. The autonomous modulator (12) is arranged at a certain distance from the antenna electrode (14) operable as emitter antenna electrode in such a way that at least a part of the space to be monitored lies between the first autonomous modulator (12) and the antenna electrode (14) operable as emitter antenna electrode. The autonomous modulator (12) is configured and arranged for emitting an RF response signal if, during operation of the system, it is excited by an RF excitation signal emitted by the antenna electrode (14) that is operated as emitter antenna electrode. The control unit (16) and the first autonomous modulator (12) are furthermore adapted to one another in such a way that the RF response signal emitted by the autonomous modulator (12) is responsive to the presence of a conductive body in the part of the space to be monitored between the first autonomous modulator (12) and the antenna electrode (14) operated as emitter antenna electrode.