A Method for Determining the Length of FBG Sensors Accurately

A Method for Determining the Length of FBG Sensors Accurately

Rajabzadeh, Aydin (TU Delft Signal Processing Systems)
Heusdens, R. (TU Delft Signal Processing Systems)
Hendriks, R.C. (TU Delft Signal Processing Systems)
Groves, R.M. (TU Delft Structural Integrity & Composites)

2019-01

In this letter, we propose a method for estimating the length of single-mode fiber Bragg grating type sensors with high accuracy. Our method is based on calculating the maximum oscillation frequency of the side-lobes of the FBG reflection spectrum. We show that this frequency is independent of the stress field to which the sensor is subjected, and is dependent on the length of the sensor. This method can be used to characterize the gauge length of already installed FBG sensors so that they can provide useful data for engineering models of structural integrity. All the analyses are based on the approximated transfer matrix model, which is a newly developed numerical method for the analysis of the FBG reflection spectrum under various stress fields.

FBG
Fiber Bragg grating
Length determination
Reflection spectrum
Structural integrity

http://resolver.tudelft.nl/uuid:8a8e15c6-831c-4071-9dc2-7d1eaee41e89

https://doi.org/10.1109/LPT.2019.2891009

2021-12-22

1041-1135

IEEE Photonics Technology Letters, 31 (2), 197-200

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2019 Aydin Rajabzadeh, R. Heusdens, R.C. Hendriks, R.M. Groves