Method for measuring material level in a container using RFID tags
First Claim
1. An apparatus for measurement of a level within a container of a material capable of attenuating radio frequency energy, said apparatus comprisinga radio transponder at a known location relative to said container, andan interrogation transmitter/receiver capable of transmitting a radio frequency signal to said radio transponder across a portion of said container capable of containing said material and evaluating a return signal to determine presence of said material in said portion of said container.
2 Assignments
0 Petitions
Accused Products
Abstract
A level of liquid of pulverent solids in a container (or volume of a liquid in the absence of gravity) is detected by using radio frequency identification (RFID) tags or similar transponders located inside or outside the container. The interrogation signal and/or the return signal is attenuated by the material and the signal strength of the return signal, if any, is evaluated either directed or in a binary fashion by imposing a threshold to determine whether or not material in contained in a portion of the container corresponding to the location of a particular RFID tag or transponder. Volume, pressure and container orientation can also be derived in accordance with one or more return signals.
65 Citations
20 Claims
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1. An apparatus for measurement of a level within a container of a material capable of attenuating radio frequency energy, said apparatus comprising
a radio transponder at a known location relative to said container, and an interrogation transmitter/receiver capable of transmitting a radio frequency signal to said radio transponder across a portion of said container capable of containing said material and evaluating a return signal to determine presence of said material in said portion of said container.
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15. A method for measuring material level in a container, said material being capable of attenuating a signal passing therethrough, said method comprising steps of
transmitting a signal through a portion of a container to a transponder, said portion of said container being capable of containing said material, and detecting said material in said portion of said container based on a return signal returned from said transponder.
Specification