Printed level sensor
The level sensor system includes a level sensor label configured to be associated with a container containing a material whose level is to be sensed, the level sensor label arrangement having a circuit which includes an inductive element electrically connected to a capacitive structure configured to be associated with the container.
1. A level sensing system comprising;
a level sensor label configured to be associated with a container containing a material whose level is to be sensed, the level sensor label arrangement having a circuit including:
a capacitive structure configured to be associated with the container, wherein the capacitive structure is configured as two separate capacitive elements positioned a distance from each other;
a first inductive element arrangement in an electrical connection with the capacitive structure; and
a second inductive element arrangement in electrical connection with the first inductive element arrangement and the capacitive structure, wherein the electrical connection of the first inductive element arrangement and the second inductive element arrangement is an electrical series connection through a connector, and wherein the first inductive element arrangement and the second inductive element arrangement are in an electrical connection with the capacitive structure via connector lines.
2. The level sensing system of claim 1 wherein the container includes one of a fluid and a solid material.
3. The level sensing system of claim 1 wherein the capacitive structure is an inter-digitated structure including pairs of horizontally oriented strips providing a digital capacitive structure.
4. The level sensing system of claim 1 wherein the level sensor label is a printed level sensor label.
5. The level sensing system of claim 1 wherein the level sensor label further includes an antenna for RF backscatter measurement.
6. The level sensing system of claim 1 further including a reader configured to receive signals from the level sensor label arrangement.
7. The level sensing system of claim 6 wherein the reader includes remote communication capability.
8. The level sensing system of claim 6 , wherein the reader is configured to communicate with the level sensor label via near field coupling to the inductor of the level sensor label.
9. The level sensing system of claim 6 wherein the reader is one of a reader built into a holder, a reader built into a shelf, and a reader which is a handheld reader.
10. The level sensing system of claim 6 wherein the reader further includes a built in data storage for batch communication of data.
11. A method of forming a level sensing system comprising:
forming a level sensor label including,
printing a first capacitive element;
printing a second capacitive element, separate from the first capacitive element, a predetermined distance from the first capacitive element, wherein the first capacitive element and the second capacitive element form a capacitive structure;
printing a first inductive element in an electrical connection with the capacitive structure;
printing a second inductive element in electrical connection arrangement with the first inductive element arrangement with the capacitive structure; and
printing electrical connections between the capacitive structure and the inductive elements, wherein the electrical connection of the first inductive element arrangement and the second inductive element arrangement is an electrical series connection through a connector, and wherein the first inductive element arrangement and the second inductive element arrangement are in an electrical connection with the capacitive structure via connector lines.
12. The method of claim 11 further including forming a reader configured to read signals from the level sensor label.
13. The method according to claim 11 further including placing the capacitive structure in association with an outer surface of a container, wherein electric field lines formed by the capacitive structure pass through at least a portion of an interior of the container.
14. The method according to claim 11 wherein the printing is at least one of ink-jet type printing, extrusion type printing, screen type printing, gravure type printing, aerosol type printing and 3D type printing.
15. The method according to claim 11 further including printing the capacitive structure and the inductive elements with a conductive ink type material.
16. The method according to claim 11 further including sensing signals from the level sensor label by a reader.
17. The method according to claim 11 further including printing an antenna as part of the level sensor label.
18. The level sensing system of claim 1 wherein the level sensor label is a disposable printed level sensor label adhered to a surface of a container.