Multi-Layer Wireless Sensor Construct for Use at Electrically-Conductive Material Surfaces

摘要

A multi-layer wireless sensor construct is provided. The construct includes a first dielectric layer adapted to be attached to a portion of a first surface of an electrically-conductive material. A layer of mu metal is provided on the first dielectric layer. A second dielectric layer is provided on the layer of mu metal. An electrical conductor is provided on the second dielectric layer wherein the second dielectric layer separates the electrical conductor from the layer of mu metal. The electrical conductor has first and second ends and is shaped to form an unconnected open-circuit that, in the presence of a time-varying magnetic field, resonates to generate a harmonic magnetic field response having a frequency, amplitude and bandwidth.

主权项

1. A multi-layer wireless sensor construct for attachment to a first surface of an electrically-conductive material and for use in sensing presence of a liquid at a second surface of the electrically-conductive material, said wireless sensor construct comprising:
a first dielectric layer adapted to be attached to a portion of the first surface of the electrically-conductive material; a layer of mu metal on said first dielectric layer wherein said first dielectric layer separates said layer of mu metal from the first surface of the electrically-conductive material; a second dielectric layer on said layer of mu metal wherein said layer of mu metal separates said first dielectric layer from said second dielectric layer; and an electrical conductor on said second dielectric layer wherein said second dielectric layer separates said electrical conductor from said layer of mu metal, said electrical conductor having first and second ends and shaped to form a spiral between said first and second ends, said first and second ends remaining electrically unconnected such that said electrical conductor so-shaped is maintained as an unconnected single-component open-circuit having inductance and capacitance wherein, in the presence of a time-varying magnetic field, said electrical conductor so-shaped resonates to generate a harmonic magnetic field response having a frequency, amplitude and bandwidth.