Patent ID: 7814786

Claim:
A wireless sensing system for simultaneously monitoring one or more of level, temperature, magnetic permeability and electrical dielectric constant of a non-gaseous material in an electrically non-conductive container, said system comprising: an environmentally-sealed housing that is electrically non-conductive, said housing adapted to be positioned adjacent to an electrically non-conductive container that stores a non-gaseous material having electrical dielectric and magnetic permeability properties, said housing spanning a selected height of the container; an electrical conductor having first and second ends and shaped to form a two-dimensional geometric pattern between said first and second ends, said conductor in said geometric pattern and portions thereof defining an open-circuit that can store and transfer electrical and magnetic energy, said conductor resonating in the presence of a time-varying magnetic field to generate a harmonic response, said conductor mounted in said housing such that said geometric pattern substantially spans said selected height of the container; and a magnetic field response recorder for wirelessly transmitting said time-varying magnetic field to power said conductor and for wirelessly detecting said harmonic response that is an indication of at least one of level of the material in the container, temperature of the material in the container, magnetic permeability of the material in the container, and dielectric constant of the material in the container.