Device and system for detecting dynamic strain
AssigneeHifi Engineering Inc.
InventorsJohn Hull, Seyed Ehsan Jalilian
Life of this patent
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Abstract
A device and system for detecting dynamic strain. The device comprises a longitudinally extending carrier and an optical fiber embedded along an outer surface of a length of the carrier. The optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths. The system comprises the device and an interrogator comprising a laser source and a photodetector. The interrogator is configured to perform interferometry by shining laser light along the optical fiber and detecting light reflected by the FBGs. The interrogator outputs dynamic strain measurements based on interferometry performed on the reflected light.
Claims24
A device for detecting dynamic strain, the device comprising:
- (a) a longitudinally extending carrier;
- (b) an optical fiber embedded along an outer surface of a length of the carrier, wherein the optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths;
- and
- (c) a longitudinally extending strength member, wherein the carrier completely surrounds at least a longitudinally extending portion of the strength member.
A system for detecting dynamic strain, the system comprising:
- (a) a device for detecting dynamic strain, the device comprising:
- (i) a longitudinally extending carrier;
- (ii) an optical fiber embedded along an outer surface of a length of the carrier, wherein the optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths;
- and
- (iii) a longitudinally extending strength member, wherein the carrier completely surrounds at least a longitudinally extending portion of the strength member;
- and
- (b) an interrogator comprising a laser source and a photodetector, wherein the interrogator is configured to perform interferometry by shining laser light along the optical fiber and detecting light reflected by the FBGs, and wherein the interrogator outputs dynamic strain measurements based on interferometry performed on the reflected light.
A method for detecting dynamic strain of a pipeline, comprising:
- (a) shining laser light along the optical fiber of a device for detecting dynamic strain buried in the ground near the pipeline, the device comprising:
- (i) a longitudinally extending carrier;
- (ii) an optical fiber embedded along an outer surface of a length of the carrier, wherein the optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths;
- and
- (iii) a longitudinally extending strength member, wherein the carrier completely surrounds at least a longitudinally extending portion of the strength member;
- and
- (b) detecting light reflected by the FBGs and performing interferometry on the reflected light to produce dynamic strain measurements based on the interferometry.
Dependencies are inferred from the claim text.