Multi-purpose sensor

摘要

A three-dimensional sensor system made from an assembly of three either semi- or fully independently oriented sensors, each of which has a working principle based on detecting the movement of a floating magnet supported by magnetic levitation. The sensor system can be used for fall detecting, tilting monitoring and vibration tracking. The volume fabrication method of making individual sensor for such as system is also given.

主权项

1. A three-dimensional sensor system made from an assembly of three either semi- or fully independently oriented sensors, each of which is comprising:
An elongated hollow tube surrounded by dielectric material with a long axle; A hard-magnet-containing floating structure, with a smaller cross section than that of the tube, whose magnetization points along said long axle of said elongated hollow tube; At least a bottom hard magnet at one end of said elongated hollow tube, whose magnetization points oppositely to said hard-magnet-containing floating structure to provide a floating mechanism for said hard-magnet-containing floating structure; A transducer sensing a magnetic field variation due to a movement of said hard-magnet-containing floating structure; and At least a pair of electrodes, built outside said elongated hollow tube, to detect a capacitance change due to the movement of said hard-magnet-containing floating structure.