Optical fiber-based sensor system having dual optical fibers providing measurements of a first and a second phase difference
First Claim
1. An optical fiber-based sensor system, comprising:
- a first optical fiber having;
a first fiber grating at a first location in the first optical fiber, reflecting light of a first wavelength; and
a second fiber grating at a second location in the first optical fiber, reflecting light of a second wavelength;
a second optical fiber; and
an optical read-out arrangement adapted to generate the light of the first wavelength and the light of the second wavelength, to inject the light of the first wavelength and the light of the second wavelength in the first optical fiber and in the second optical fiber, to measure a first phase difference between the light of the first wavelength emanating from the first optical fiber and the light of the first wavelength emanating from the second optical fiber, to measure a second phase difference between the light of the second wavelength emanating from the first optical fiber and the light of the second wavelength emanating from the second optical fiber, and to provide a measurement result based on a difference between the first phase difference and the second phase.
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Accused Products
Abstract
An optical fiber-based sensor system includes a sensing optical fiber having fiber gratings that reflect light at respective wavelengths. A first fiber grating reflects light at a first wavelength. A second fiber grating reflects light at a second wavelength. The system also has a reference optical fiber. An optical read-out arrangement generates light at the first and second wavelengths. The light is injected in the sensing optical fiber and in the reference optical fiber. A first phase difference is measured between light at the first wavelength emanating from the sensing optical fiber and the reference optical fiber. In addition, a second phase difference is measured between light at the second wavelength emanating from the sensing optical fiber the reference optical fiber. A measurement result is based on a difference between the first phase difference and the second phase difference.
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Citations
17 Claims
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1. An optical fiber-based sensor system, comprising:
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a first optical fiber having; a first fiber grating at a first location in the first optical fiber, reflecting light of a first wavelength; and a second fiber grating at a second location in the first optical fiber, reflecting light of a second wavelength; a second optical fiber; and an optical read-out arrangement adapted to generate the light of the first wavelength and the light of the second wavelength, to inject the light of the first wavelength and the light of the second wavelength in the first optical fiber and in the second optical fiber, to measure a first phase difference between the light of the first wavelength emanating from the first optical fiber and the light of the first wavelength emanating from the second optical fiber, to measure a second phase difference between the light of the second wavelength emanating from the first optical fiber and the light of the second wavelength emanating from the second optical fiber, and to provide a measurement result based on a difference between the first phase difference and the second phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An optical fiber-based sensing method, comprising:
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a first optical fiber having a first fiber grating at a first location in the first optical fiber and reflecting light of a first wavelength, and a second fiber grating at a second location in the first optical fiber and reflecting light of a second wavelength, and a second optical fiber, wherein the method comprises; generating light of the first wavelength and of the second wavelength; injecting the light in the first optical fiber and in the second optical fiber; measuring a first phase difference between light of the first wavelength emanating from the first optical fiber and light of the first wavelength emanating from the second optical fiber; measuring a second phase difference between light of the second wavelength emanating from the first optical fiber and light of the second wavelength emanating from the second optical fiber; and providing a measurement result based on a difference between the first phase difference and the second phase difference that have been measured.
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Specification