Strain sensor systems
First Claim
1. A system for inspecting a rail of a railroad track, comprising:
- a radio frequency (RF) resonant sensor;
an RF interrogator device; and
a controller configured to direct the RF interrogator device to emit coarse interrogation signals of different frequencies during a coarse scan of the rail of the railroad track, while at least one of the RF resonant sensor or the RF interrogator device, disposed on a rail vehicle, moves relative to another of the RF resonant sensor or the RF interrogator device,wherein the RF resonant sensor is configured to emit a first responsive RF signal in response to receiving at least one of the coarse interrogation signals within a frequency range of a frequency of interest of the RF resonant sensor,wherein the controller is configured to identify the frequency of interest of the RF resonant sensor based on receipt of the first responsive RF signal, the controller also configured to direct the RF interrogator device to emit fine interrogation signals of different frequencies during a fine scan subsequent to the coarse scan, the fine interrogation signals emitted at the different frequencies within a frequency band on both sides of the frequency of interest,wherein the RF resonant sensor is configured to emit a second responsive RF signal in response to receiving at least one of the fine interrogation signals, andwherein the controller is configured to identify a center frequency of the RF resonant sensor based on receipt of the second responsive RF signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A strain sensor system emits coarse interrogation signals of different frequencies during a coarse scan while an RF resonant sensor and/or an RF interrogator moves relative to the other. The sensor emits responsive RF signals within a frequency range of a frequency of interest of the sensor. The controller identifies the frequency of interest based on receipt of the responsive signals. The interrogator emits fine interrogation signals of different frequencies during a fine scan subsequent to the coarse scan. The fine signals are emitted at frequencies within a frequency band on both sides of the frequency of interest. The sensor emits responsive RF signals and the controller identifies a center frequency of the RF resonant sensor based on receipt of the responsive signals.
17 Citations
19 Claims
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1. A system for inspecting a rail of a railroad track, comprising:
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a radio frequency (RF) resonant sensor; an RF interrogator device; and a controller configured to direct the RF interrogator device to emit coarse interrogation signals of different frequencies during a coarse scan of the rail of the railroad track, while at least one of the RF resonant sensor or the RF interrogator device, disposed on a rail vehicle, moves relative to another of the RF resonant sensor or the RF interrogator device, wherein the RF resonant sensor is configured to emit a first responsive RF signal in response to receiving at least one of the coarse interrogation signals within a frequency range of a frequency of interest of the RF resonant sensor, wherein the controller is configured to identify the frequency of interest of the RF resonant sensor based on receipt of the first responsive RF signal, the controller also configured to direct the RF interrogator device to emit fine interrogation signals of different frequencies during a fine scan subsequent to the coarse scan, the fine interrogation signals emitted at the different frequencies within a frequency band on both sides of the frequency of interest, wherein the RF resonant sensor is configured to emit a second responsive RF signal in response to receiving at least one of the fine interrogation signals, and wherein the controller is configured to identify a center frequency of the RF resonant sensor based on receipt of the second responsive RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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directing a radio frequency (RF) interrogator device to emit coarse interrogation signals of different frequencies during a coarse scan of an RF resonant sensor while at least one of the RF resonant sensor or the RF interrogator device moves relative to another of the RF resonant sensor or the RF interrogator device; receiving a first responsive RF signal from the RF resonant sensor in response to the RF resonant sensor receiving at least one of the coarse interrogation signals within a frequency range of a frequency of interest of the RF resonant sensor; identifying the frequency of interest of the RF resonant sensor based on receipt of the first responsive RF signal; directing the RF interrogator device to emit fine interrogation signals of different frequencies during a fine scan after the coarse scan, the fine interrogation signals emitted at the different frequencies within a frequency band on both sides of the frequency of interest; receiving a second responsive RF signal from the RF resonant sensor in response to receiving at least one of the fine interrogation signals; and identifying a center frequency of the RF resonant sensor based on receipt of the second responsive RF signal. - View Dependent Claims (15, 16, 17)
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18. A method comprising:
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obtaining an installation prescription associated with adhering a radio frequency (RF) resonant sensor to an external body, the installation prescription dictating one or more designated conditions in which to couple the RF resonant sensor to the external body using an adhesive; determining one or more ambient conditions of the external body; determining that the one or more ambient conditions differ from the one or more designated conditions of the installation prescription; and modifying at least one of the ambient conditions based on determining that the one or more ambient conditions differ from the one or more designated conditions; applying the adhesive to one or more of the RF resonant sensor or the external body; coupling the RF resonant sensor with a first lateral side of the external body using the adhesive; and rapidly curing the adhesive by heating an opposite second lateral side of the external body. - View Dependent Claims (19)
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Specification