Sensors for monitoring structural health conditions
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Abstract
Sensors and systems for monitoring structural health conditions. The present invention provides a device for monitoring structural health conditions including a dielectric substrate, a piezoelectric device for actuating and/or sensing Lamb waves, a molding layer deposited over the piezoelectric device, a cover layer deposited over the molding layer and a hoop layer surrounding the piezoelectric device and being attached to the substrate. The device further includes an optical fiber coil sensor attached to the dielectric substrate, where the coil sensor has a rolled optical fiber cable and a coating layer applied to the rolled optical fiber cable. The present invention also provides a diagnostic patch network that includes a plurality of patch sensors attached to a host structure and a bridge box connected to the patch sensors. The bridge box sends information of structural health conditions to and receive power from a ground control system using a wireless communication technique.
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Citations
40 Claims
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1-9. -9. (canceled)
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10. A sensor for monitoring structural health conditions, comprising:
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a pickup unit including;
a rolled optical fiber cable having tensile stress along the longitudinal axis thereof; and
a coating layer applied to the rolled optical fiber cable and operative to sustain said tensile stress in said rolled optical fiber cable;
wherein vibration of the rolled optical fiber cable is operative to generate a frequency shift of a light signal passed therethrough, said frequency shift being commensurate with the vibration. - View Dependent Claims (11, 12, 14, 18, 22, 23, 34, 35)
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13. (canceled)
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15-17. -17. (canceled)
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19-21. -21. (canceled)
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24-33. -33. (canceled)
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36. A sensor unit for monitoring structural health conditions, comprising:
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a plurality of rolled optical fiber cables coupled to a structure, each of the rolled optical fiber cables having tensile stress along the longitudinal axis thereof; and
a coating layer applied to the rolled optical fiber cables and operative to sustain the tensile stress in each of said rolled optical fiber cables;
wherein vibration of each said rolled optical fiber cable is operative to generate a frequency shift of a light signal passed therethrough, said frequency shift being commensurate with vibration. - View Dependent Claims (37, 38, 39, 40)
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Specification