Multi-parameter fiber optic sensor for use in harsh environments
First Claim
1. A multi-parameter sensor for sensing at least one of a plurality of measurand fields in an environment, comprising:
- a tubularly enclosed optical fiber having a reference means in contact with a reference location in said optical fiber for isolating said reference location in said optical fiber from mechanically induced strain; and
Bragg grating sensing means, positioned with respect to said reference means, responsive to an optical signal and to a strain associated with a respective measurand field for providing an optical sensing signal related to a magnitude of said respective measurand field.
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Accused Products
Abstract
A sensor capable of measuring a number of physical parameters in a harsh environment includes a plurality of intrinsic fiber optic sensor elements formed within a core of an optical fiber, the optical fiber being disposed within a capillary tube made of a high strength, corrosion resistant material. The sensor is located at a distal end of the capillary tube, and the capillary tube is mounted in a monitoring location, such as mounted to the casing of an electrically submersible pump (ESP), such that the sensor can be utilized to measure physical parameters, including static and dynamic pressure, temperature, acceleration and acoustic signals, at the monitoring location. Each sensor is constructed such that a reference element, such as a rigid element, isolates a reference location in the optical fiber from mechanically induced strain. A Bragg grating sensing element is positioned with respect to the reference element, and responsive to an optical signal and to a strain associated with a respective measurand field for providing an optical sensing signal related to a magnitude of the respective measurand field.
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Citations
36 Claims
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1. A multi-parameter sensor for sensing at least one of a plurality of measurand fields in an environment, comprising:
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a tubularly enclosed optical fiber having a reference means in contact with a reference location in said optical fiber for isolating said reference location in said optical fiber from mechanically induced strain; and Bragg grating sensing means, positioned with respect to said reference means, responsive to an optical signal and to a strain associated with a respective measurand field for providing an optical sensing signal related to a magnitude of said respective measurand field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multi-parameter sensor for sensing a plurality of measurand fields in an environment, comprising:
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a tubularly enclosed optical fiber having at least one reference means in contact with a respective reference location in said optical fiber for isolating said respective reference location in said optical fiber from mechanically induced strain; and a plurality of Bragg grating sensing means, each positioned with respect to a respective reference means, each responsive to an optical signal and to a strain associated with a respective measurand field for providing a respective optical sensing signal related to a magnitude of said respective measurand field. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A sensor for sensing at least one of a plurality of measurand fields in an environment, comprising:
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an optical fiber having a reference device in contact with a reference location in said optical fiber for isolating said reference location in said optical fiber from mechanically induced strain; and a Bragg grating formed within said optical fiber and positioned with respect to said reference device, said Bragg grating being responsive to an optical signal and to a strain associated with a respective measurand field for providing an optical sensing signal related to a magnitude of said respective measurand field. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification