Measurement sensor
First Claim
1. A measurement sensor comprising a radio frequency identification (RFID) circuit for measuring a parameter, wherein the circuit comprises at least one variable component adapted to vary a characteristic of that component to reflect a change in a measured parameter, such that a frequency used by the sensor to communicate with a reader varies according to changes in the measured parameter;
- wherein the measured parameter is selected from the group consisting of;
pressure;
temperature;
time;
velocity;
angle;
length;
mass;
acceleration;
area;
volume;
energy;
power; and
torque; and
a secondary parameter derived from one or more of the foregoing parameters; and
,wherein the variable component of the circuit is a capacitor or a coil.
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Accused Products
Abstract
This invention is directed to a measurement sensor comprising a radio frequency identification circuit for measuring a parameter. The circuit comprises at least of one component in which a characteristic of that component can be changed to reflect a change in a measured parameter, such that the frequency of the sensor varies according to changes in the measured parameter. The invention extends to a system for measuring a variable parameter that incorporates such a sensor.
18 Citations
13 Claims
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1. A measurement sensor comprising a radio frequency identification (RFID) circuit for measuring a parameter, wherein the circuit comprises at least one variable component adapted to vary a characteristic of that component to reflect a change in a measured parameter, such that a frequency used by the sensor to communicate with a reader varies according to changes in the measured parameter;
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wherein the measured parameter is selected from the group consisting of;
pressure;
temperature;
time;
velocity;
angle;
length;
mass;
acceleration;
area;
volume;
energy;
power; and
torque; and
a secondary parameter derived from one or more of the foregoing parameters; and
,wherein the variable component of the circuit is a capacitor or a coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification