DETERMINING PHYSICAL PROPERTIES OF STRUCTURAL MEMBERS IN DYNAMIC MULTI-PATH CLUTTER ENVIRONMENTS
First Claim
1. A method for determining a physical property of a structural member in a dynamic multi-path clutter environment, the method comprising:
- transmitting an RF interrogation signal to a wireless sensor physically coupled to the structural member in the dynamic multi-path environment, wherein the wireless sensor is operable to receive the RF interrogation signal, produce a reference signal and a measurement signal, and transmit the reference signal and the measurement signal in the dynamic multi-path clutter environment, whereinthe reference signal and the measurement signal are derived from the RF interrogation signal,the reference signal is delayed by a first time delay,the measurement signal is delayed by a second time delay that is a function of the physical property to be determined, andthe first and second time delays are associated by a known relationship defined by the wireless sensor;
receiving the transmitted reference signal and the transmitted measurement signal; and
comparing the transmitted reference signal and the transmitted measurement signal in the time domain and, using this comparison, determining the physical property of the structural member.
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Accused Products
Abstract
A method for determining a physical property of a structural member in a dynamic multi-path clutter environment is given. The method comprises transmitting an RF interrogation signal to a wireless sensor operable to receive the RF interrogation signal, produce a reference signal and a measurement signal, and transmit the reference signal and the measurement signal in the dynamic multi-path clutter environment. The reference signal is delayed by a first time delay and the measurement signal is delayed by a second time delay that is a function of the physical property to be determined. The first and second time delays are associated by a known relationship defined by the wireless sensor. The method further comprises receiving the transmitted reference signal and the transmitted measurement signal and comparing the transmitted reference signal and the transmitted measurement signal in the time domain. Finally, the method comprises using this comparison to determine the physical property of the structural member.
18 Citations
9 Claims
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1. A method for determining a physical property of a structural member in a dynamic multi-path clutter environment, the method comprising:
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transmitting an RF interrogation signal to a wireless sensor physically coupled to the structural member in the dynamic multi-path environment, wherein the wireless sensor is operable to receive the RF interrogation signal, produce a reference signal and a measurement signal, and transmit the reference signal and the measurement signal in the dynamic multi-path clutter environment, wherein the reference signal and the measurement signal are derived from the RF interrogation signal, the reference signal is delayed by a first time delay, the measurement signal is delayed by a second time delay that is a function of the physical property to be determined, and the first and second time delays are associated by a known relationship defined by the wireless sensor; receiving the transmitted reference signal and the transmitted measurement signal; and comparing the transmitted reference signal and the transmitted measurement signal in the time domain and, using this comparison, determining the physical property of the structural member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for determining a physical property of a structural member in a dynamic multi-path clutter environment, the system comprising a transponder, a wireless sensor, and a signal processing unit, wherein:
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the transponder is operable to transmit a wireless RF interrogation signal to the wireless sensor in a dynamic multi-path clutter environment and receive wireless signals transmitted by the wireless sensor in a dynamic multi-path clutter environment; the wireless sensor is operable to receive the RF interrogation signal transmitted by the transponder, produce a reference signal and a measurement signal, and transmit the reference signal and the measurement signal in the dynamic multi-path clutter environment; the reference signal and measurement signal are derived from the RF interrogation signal; the reference signal is delayed by a first time delay; the measurement signal is delayed by a second time delay that is a function of the physical property to be determined; and the signal processing unit is electrically coupled to the transponder and is operable to compare the reference signal and the measurement signal in the time domain and, using this comparison, determine the physical property of the structural member.
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Specification
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- Resources
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Current AssigneeSyntonics, LLC, The Ohio State University Research Foundation
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Original AssigneeSyntonics, LLC, The Ohio State University Research Foundation
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InventorsBayram, Yakup, Gemeny, Steven E., Bruce, Gary W., Montgomery, Bruce G., Tuncay, Orbay, Crowe, Douglas E., Walton, Eric K.
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Application NumberUS12/330,134Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current342/51CPC Class CodesG01S 13/755 using delay lines, e.g. aco...
