Passive and wireless displacement measuring device using parallel sensors
First Claim
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1. A system for a performing a remote measurement of the displacement between two adjacent objects, comprising:
- a pair of sensors, each sensor having a magnetic rod and a sensor coil;
wherein each sensor is operable to form a tuned circuit, and wherein the sensors have substantially the same resonant frequency;
an interrogator having a transmit coil and at least one receive coil, transmit circuitry for delivering to the sensor coils an excitation signal through a range of frequencies, and receive circuitry for receiving a response signal from the sensor coils;
wherein the interrogator is operable to detect a pair of peak frequencies from the sensors when the sensors are placed substantially parallel to each other in an environment where displacement is to be measured.
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Abstract
A system that remotely measures displacement between two objects. A passive sensor is affixed to each object, such that the sensors are substantially parallel. Each sensor has a permeable rod, a surrounding coil, and a tuning capacitor, and have substantially the same resonant frequency. When an interrogating device is placed near the sensors, the frequency responses of the sensors indicates their relative displacement and thus the displacement between the objects.
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Citations
24 Claims
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1. A system for a performing a remote measurement of the displacement between two adjacent objects, comprising:
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a pair of sensors, each sensor having a magnetic rod and a sensor coil;
wherein each sensor is operable to form a tuned circuit, and wherein the sensors have substantially the same resonant frequency;
an interrogator having a transmit coil and at least one receive coil, transmit circuitry for delivering to the sensor coils an excitation signal through a range of frequencies, and receive circuitry for receiving a response signal from the sensor coils;
wherein the interrogator is operable to detect a pair of peak frequencies from the sensors when the sensors are placed substantially parallel to each other in an environment where displacement is to be measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for determining displacement between two objects, comprising the steps of:
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attaching a first sensor to a first location;
attaching a second sensor to a second location, such that the second sensor is substantially parallel to the first sensor;
wherein each sensor has a rod, a coil, and a capacitor, electrically connected such that the rod, the sensor coil, and the capacitor form a tuned circuit;
interrogating the sensors with an interrogation signal; and
receiving a response signal from the sensors, said response signal having a pair of peak frequencies that indicate the motion of the sensors relative to each other. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for determining displacement between two objects within a living body, comprising the steps of:
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attaching a first sensor to a first skeletal object;
attaching a second sensor to a second skeletal object, such that the second sensor is substantially parallel to the first sensor;
wherein each sensor has a rod, a coil, and a capacitor, electrically connected such that the rod, the sensor coil, and the capacitor form a tuned circuit;
interrogating the sensors with an interrogation signal; and
receiving a response signal from the sensors, said response signal having a pair of peak frequencies that indicate the motion of the sensors relative to each other - View Dependent Claims (24)
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Specification