Target position, movement and tracking system
US9915748B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2012 |
| Grant date | Mar 13, 2018 |
| Priority date | — |
| Expiry date | Apr 23, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2491
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a target object detection system, comprising a plurality of sensing nodes (10) for positioning at respective detection locations with respect to a detection area (12) that is situated within a field generated by an ambient AC source of excitation. Each sensing node has at least one electric potential sensor (22, 42) designed to detect perturbations in said field caused by a target object (14), said one sensor including an electrode (20, 40) responsive to the AC excitation field for generating detection signals, an amplifier (28) connected to the electrode for receiving and amplifying the detection signals to produce AC measurement signals as output, and at least one feedback circuit (30, 36) from an output of the amplifier to an input thereof for enhancing the input impedance of the amplifier. A signal processing arrangement (24, 26, 44) is associated with each sensing node and comprising a filter circuit (24) adapted to filter out frequencies generated by the ambient AC source of excitation that are outside a pre-defined bandwidth, and a level detector (26) responsive to the AC measurement signals for monitoring signal amplitude and generating amplitude info…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.