4.7 Article

Method for $In-Situ$ Strain Transfer Calibration of Surface Bonded Fiber Bragg Gratings

期刊

IEEE SENSORS JOURNAL
卷 19, 期 24, 页码 11926-11931

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2936533

关键词

Optical fiber sensor; fiber gratings; bragg gratings; strain measurement

资金

  1. New Zealand Ministry of Business, Innovation and Employment (MBIE) [RTVU1304]

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This paper reports on a method for strain calibration of fiber optic sensors which have been adhesively bonded to a structural member. Generally, the coefficient of strain transfer (k(ST)) can be used to calibrate the strain sensitivity of the surface bonded FBG. Here we propose an alternative method to determine k(ST) which is based solely on observing the temperature-dependent behaviour of the adhesively mounted FBG sensor. In this paper we prove the validity of our method by comparing k(ST) determined via a conventional strain (mechanical) calibration and via our alternative temperature (thermal) calibration. A set of 18 surface bonded FBGs with coefficients ranging from 0.5 to 1 are investigated. The average deviation of k(ST) determined via a temperature calibration versus a mechanical strain calibration was similar to 5%, with a maximum deviation of 13% obtained from the set of bonded sensors measured in this work. This led to an average relative accuracy of < 6%, when the strain sensors were calibrated using our temperature-based calibration method.

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