Generator protection system
First Claim
1. A system, comprising:
- at least one temperature sensor, each temperature sensor comprising;
an optical fiber;
at least one twin-grating structure formed on the optical fiber, each twin-grating structure comprising;
a first optical grating structure, a second optical grating structure adjacent the first optical grating structure, and a sensing cavity disposed between the first and second optical grating structures, each twin-grating structure selectively responsive to a unique wavelength of light to generate an optical interference fringe signal;
wherein, for each twin-grating structure, an optical property of the twin-grating structure and a phase of the optical interference fringe signal generated by the twin-grating structure are determined by a temperature of the twin-grating structure;
a laser source coupled to each temperature sensor to input light into the optical fiber, the laser source configured to output the unique wavelength of each twin-grating structure formed on the optical fiber;
for each temperature sensor, an optical detector coupled to the optical fiber, wherein when the laser source outputs the unique wavelength of a twin-grating structure formed on the optical fiber, the optical detector receives the optical interference fringe signal to generate a corresponding electrical interference fringe signal; and
a processor coupled to the optical detector of each temperature sensor, the processor programmed to, for each twin-grating-structure of each temperature sensor, extract a target fringe of the optical interference fringe signal based on a digital representation of the electrical interference fringe signal and track variation in a phase of the target fringe over time to determine variation in the temperature.
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Abstract
A temperature sensor is disclosed. The sensor includes an optical fiber and at least one twin-grating structure formed on the optical fiber. Each twin-grating structure includes a first optical grating structure, a second optical grating structure adjacent the first optical grating structure, and a sensing cavity disposed between the first and second optical grating structures. Each twin-grating structure is selectively responsive to a unique wavelength of light to generate an optical interference fringe signal. For each twin-grating structure, an optical property of the twin-grating structure and a phase of the optical interference fringe signal generated by the twin-grating structure are determined by a temperature of the twin-grating structure.
44 Citations
19 Claims
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1. A system, comprising:
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at least one temperature sensor, each temperature sensor comprising; an optical fiber; at least one twin-grating structure formed on the optical fiber, each twin-grating structure comprising;
a first optical grating structure, a second optical grating structure adjacent the first optical grating structure, and a sensing cavity disposed between the first and second optical grating structures, each twin-grating structure selectively responsive to a unique wavelength of light to generate an optical interference fringe signal;wherein, for each twin-grating structure, an optical property of the twin-grating structure and a phase of the optical interference fringe signal generated by the twin-grating structure are determined by a temperature of the twin-grating structure; a laser source coupled to each temperature sensor to input light into the optical fiber, the laser source configured to output the unique wavelength of each twin-grating structure formed on the optical fiber; for each temperature sensor, an optical detector coupled to the optical fiber, wherein when the laser source outputs the unique wavelength of a twin-grating structure formed on the optical fiber, the optical detector receives the optical interference fringe signal to generate a corresponding electrical interference fringe signal; and a processor coupled to the optical detector of each temperature sensor, the processor programmed to, for each twin-grating-structure of each temperature sensor, extract a target fringe of the optical interference fringe signal based on a digital representation of the electrical interference fringe signal and track variation in a phase of the target fringe over time to determine variation in the temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18, 19)
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15. The system of 1, wherein a first temperature sensor is in contact with at least one main lead connection of a generator, and wherein the processor is programmed to monitor temperature variations of each twin-grating structure based on the tracked variation in the phases of the corresponding target fringes.
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16. The system of 1, wherein a first temperature sensor is in contact with at least one end winding of a generator, and wherein the processor is programmed to monitor temperature variations of each twin-grating structure based on the tracked variation in the phases of the corresponding target fringes.
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17. The system of 1, wherein a first temperature sensor is in contact with at least one lead box of a generator, and wherein the processor is programmed to monitor temperature variations of each twin-grating structure based on the tracked variation in the phases of the corresponding target fringes.
Specification