Fuel level sensor having dual fluorescent plastic optical fibers
First Claim
1. An optical fiber assembly comprising:
- first, second and third holding rods;
first, second and third glass tubes respectively partially embedded in and partially protruding from the first, second and third holding rods;
a side-emitting optical fiber having a portion embedded in the first glass tube;
a first fluorescent optical fiber having a portion embedded in the second glass tube;
a second fluorescent optical fiber having a portion embedded in the third glass tube; and
a supporting structure that supports the first, second and third holding rods in locations such that that light emitted by the side-emitting optical fiber will be received by the first and second fluorescent optical fibers.
1 Assignment
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Accused Products
Abstract
An airplane fuel level optical sensor using one side-emitting plastic optical fiber (SPOF) and two fluorescent plastic optical fibers (FPOFs) to detect the airplane fuel level without using any electrically conductive component or element placed inside the fuel tank. This dual-FPOF sensor is capable of achieving high resolution and high accuracy with a one-time calibration in the actual airplane'"'"'s fuel tank environment. One embodiment of the dual-FPOF sensor uses one SPOF and two FPOFs to detect fuel level change based on the optical signal output from the two FPOFs. The sensor design uses large-diameter (core and cladding), lightweight, low-cost and high-durability plastic optical fiber, which is very desirable for airplane installation.
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Citations
20 Claims
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1. An optical fiber assembly comprising:
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first, second and third holding rods; first, second and third glass tubes respectively partially embedded in and partially protruding from the first, second and third holding rods; a side-emitting optical fiber having a portion embedded in the first glass tube; a first fluorescent optical fiber having a portion embedded in the second glass tube; a second fluorescent optical fiber having a portion embedded in the third glass tube; and a supporting structure that supports the first, second and third holding rods in locations such that that light emitted by the side-emitting optical fiber will be received by the first and second fluorescent optical fibers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for containing a liquid, the system comprising a reservoir and an optical fiber assembly installed in the reservoir, wherein the optical fiber assembly comprises:
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an outer tube having first and second ends; a first end cap having a portion seated inside the first end of the outer tube; a second end cap seated inside the second end of the outer tube; a side-emitting optical fiber extending from the second end cap to and through the first end cap; a first fluorescent optical fiber extending from the second end cap to and through the first end cap; and a second fluorescent optical fiber extending from the second end cap to and through the first end cap, wherein the first and second end caps support the side-emitting optical fiber and the first and second fluorescent optical fibers such that light emitted by the side-emitting optical fiber and not obstructed by intervening matter will be received by the first and second fluorescent optical fibers. - View Dependent Claims (14, 15, 16)
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17. An aircraft comprising a fuel tank and an optical sensor disposed inside the fuel tank, wherein the optical sensor comprises:
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an outer tube having first and second ends; a first end cap having at least a portion seated inside the first end of the outer tube; a second end cap seated inside the second end of the outer tube; a side-emitting optical fiber extending from the second end cap to and through the first end cap; a first fluorescent optical fiber extending from the second end cap to and through the first end cap; and a second fluorescent optical fiber extending from the second end cap to and through the first end cap, wherein the first and second end caps support the side-emitting optical fiber and the first and second fluorescent optical fibers such that light emitted by the side-emitting optical fiber and not obstructed by intervening matter will be received by the first and second fluorescent optical fibers. - View Dependent Claims (18, 19, 20)
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Specification