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Sensors 2015, 15(2), 4264-4272; doi:10.3390/s150204264

Simultaneous 2D Strain Sensing Using Polymer Planar Bragg Gratings

1
Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Wuerzburger Strasse 45, 63743 Aschaffenburg, Germany
2
Institute of Microwaves and Photonics, University of Erlangen-Nuernberg, Cauerstrasse 9, 91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Received: 5 January 2015 / Revised: 28 January 2015 / Accepted: 7 February 2015 / Published: 12 February 2015
(This article belongs to the Special Issue Optical Sensors for Chemical, Biological and Industrial Applications)
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Abstract

We demonstrate the application of polymer planar Bragg gratings for multi-axial strain sensing and particularly highlight simultaneous 2D strain measurement. A polymer planar Bragg grating (PPBG) fabricated with a single writing step in bulk polymethylmethacrylate is used for measuring both tensile and compressive strain at various angles. It is shown that the sensitivity of the PPBG strongly depends on the angle between the optical waveguide into which the grating is inscribed and the direction along which the mechanical load is applied. Additionally, a 2D PPBG fabricated by writing two Bragg gratings angularly displaced from each other into a single polymer platelet is bonded to a stainless steel plate. The two reflected wavelengths exhibit different sensitivities while tested toward tensile and compressive strain. These characteristics make 2D PPBG suitable for measuring multi-axial tensile and compressive strain. View Full-Text
Keywords: optical sensing; planar Bragg grating; polymers; tensile and compressive strain; single writing step optical sensing; planar Bragg grating; polymers; tensile and compressive strain; single writing step
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rosenberger, M.; Eisenbeil, W.; Schmauss, B.; Hellmann, R. Simultaneous 2D Strain Sensing Using Polymer Planar Bragg Gratings. Sensors 2015, 15, 4264-4272.

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