Volume 119, Number 2, July 2017
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 October 2017|
Bending sensors based on fiber Bragg gratings: The key role of the mean effective index
1 Institut de Génie Civil et de Mécanique (GeM), Université de Nantes, UMR CNRS 6183 - 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
2 Laboratoire PhLAM, Université de Lille 1, UMR CNRS 8523 - Cité Scientifique, Bâtiment P5, 59655 Villeneuve D'Ascq, France
3 Entreprise iXblue - Rue Paul Sabatier, 22300 Lannion, France
Received: 16 May 2017
Accepted: 12 September 2017
In this article we show that the Bragg wavelength variation induced by a curvature in the fiber Bragg grating is related to both the variation of the effective index and the variation of the coupling coefficient of counter-propagating modes. The weighting coefficient between the two variables is the mean effective index of the grating. The two effects act in opposition as proved both by our model and by our experimental observations. This work can be used to design strain sensors insensitive to bending, or, on the contrary, bending sensors insensitive to strain.
PACS: 42.79.Dj – Gratings / 42.81.Pa – Sensors, gyros / 06.30.Bp – Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
© EPLA, 2017
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