Shear and pressure/transverse strain fiber grating sensors
First Claim
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1. A fiber optic grating shear sensor including:
- a fiber grating written onto birefringent optical fiber;
a first loading plate located on top of said fiber grating written onto birefringent optical fiber;
a second loading plate located below said fiber grating written onto birefringent optical fiber;
a first spacer located to the right of said fiber grating written onto birefringent fiber, a second spacer located to the left of said fiber grating written onto birefringent fiber;
major polarization axes of said fiber grating written onto birefringent fiber being oriented at an angle relative that is approximately 45 degrees relative to the plane of said first and second loading plates;
a bond between said fiber grating written onto birefringent optical fiber and said first and second loading plates;
a bond between said first and second spacing optical fibers and said first and second loading plates;
whereby shear strain may be determined.
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Abstract
A fiber grating that is written into birefringent optical fiber may be placed between two loading plates and bonded in place. The principal polarization axes of the fiber grating written into birefringent optical fiber are approximately 45 degrees relative to the plane of the loading plates and utilizing spacers of a thickness approximately equal to the diameter of the fiber grating written onto birefringent fiber between the plates to measure shear. The principal polarization axes of the fiber grating written onto birefringent optical fiber at approximately 90 degrees relative to the loading plates may be used to measure pressure. When the top and bottom loading plates are of unequal size adhesive and strain relief tubes may be used in conjunction with the loading plates to provide strain relief to the shear and pressure sensors.
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Citations
21 Claims
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1. A fiber optic grating shear sensor including:
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a fiber grating written onto birefringent optical fiber;
a first loading plate located on top of said fiber grating written onto birefringent optical fiber;
a second loading plate located below said fiber grating written onto birefringent optical fiber;
a first spacer located to the right of said fiber grating written onto birefringent fiber, a second spacer located to the left of said fiber grating written onto birefringent fiber;
major polarization axes of said fiber grating written onto birefringent fiber being oriented at an angle relative that is approximately 45 degrees relative to the plane of said first and second loading plates;
a bond between said fiber grating written onto birefringent optical fiber and said first and second loading plates;
a bond between said first and second spacing optical fibers and said first and second loading plates;
whereby shear strain may be determined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 17, 18, 20, 21)
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10. A fiber grating pressure sensor including:
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a fiber grating written onto birefringent optical fiber;
a first loading plate located on top of said fiber grating written onto birefringent optical fiber;
a second loading plate located below said fiber grating written onto birefringent optical fiber;
major polarization axes of said fiber grating written onto birefringent fiber being oriented at an angle relative that is approximately 90 degrees relative to the plane of said first and second loading plates;
a bond at the edges between said first and second loading plates;
said first loading plate being different in size from said second loading plate;
whereby pressure may be determined.
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16. A fiber optic grating shear sensor including:
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a fiber grating written onto birefringent optical fiber;
a first loading means located on top of said fiber grating written onto birefringent optical fiber;
a second loading means located below said fiber grating written onto birefringent optical fiber;
a first spacing means located to the right of said fiber grating written onto birefringent fiber, a second spacing means located to the left of said fiber grating written onto birefringent fiber;
major polarization axes of said fiber grating written onto birefringent fiber being oriented at an angle relative that is approximately 45 degrees relative to the plane of said first and second loading means;
a bonding means between said fiber grating written onto birefringent optical fiber and said first and second loading means;
a bonding means between said first and second spacing means and said first and second loading means;
whereby shear strain may be determined. - View Dependent Claims (19)
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Specification
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Current AssigneeEric Udd, Sean Geoffrey Calvert, Stephen Tod Kreger
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Original AssigneeEric Udd, Sean Geoffrey Calvert, Stephen Tod Kreger
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InventorsKreger, Stephen Tod, Calvert, Sean Geoffrey, Udd, Eric
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Application NumberUS11/071,959Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current250/227.14CPC Class CodesG01B 7/18 using change in resistanceG01L 1/246 using integrated gratings, ...
