Measurement of axial and bending strain in pipelines using Bragg grating sensors

John W. Berthold III

doi:10.1117/12.417396

1 March 2001 Measurement of axial and bending strain in pipelines using Bragg grating sensors

John W. Berthold III

Proceedings Volume 4204, Fiber Optic Sensor Technology II; (2001) https://doi.org/10.1117/12.417396
Event: Environmental and Industrial Sensing, 2000, Boston, MA, United States

Abstract

The objective ofthis work was to demonstrate the feasibility ofusing fiber Optic Bragg grating sensors (BGS) to measure axial and bending strain in pipes. A special test section was used to characterize the performance ofthe BGS and compare the results with standard electrical resistance foil strain gages. Two sets of pipe strain tests were performed. In the first tests series, an optical fiber containing four BGS was used. The BUS were positioned along the pipe test section and directly attached to the outside surface ofthe pipe wall. In the second tests series, a second fiber was used and four BGS were encapsulated inside a stainless steel tube which was attached to the outside ofthe pipe wall. All tests were successfully completed and the results demonstrate that fiber optic Bragg grating sensors can be used in a practical configuration to measure axial and bending strain in pipes. The repeatability ofthe strain measurements was 2 microstrain in the first tests series and 6 microstrain in the second test series. The strain resolution was less than 1 microstrain. The test results also showed that as few as three BGS in one fiber can distinguish axial strain from bending strain.

Citation Download Citation

John W. Berthold III "Measurement of axial and bending strain in pipelines using Bragg grating sensors", Proc. SPIE 4204, Fiber Optic Sensor Technology II, (1 March 2001); https://doi.org/10.1117/12.417396

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