title: Simultaneous 2D strain sensing using polymer planar Bragg gratings.
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.
authors: Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Wuerzburger Strasse 45, 63743 Aschaffenburg, Germany. manuel.rosenberger@h-ab.de.
authors: Manuel
authors: M
authors: Rosenberger
authors: Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Wuerzburger Strasse 45, 63743 Aschaffenburg, Germany. s8448@h-ab.de.
authors: Waltraud
authors: W
authors: Eisenbeil
authors: Institute of Microwaves and Photonics, University of Erlangen-Nuernberg, Cauerstrasse 9, 91058 Erlangen, Germany. bernhard.schmauss@fau.de.
authors: Bernhard
authors: B
authors: Schmauss
authors: Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Wuerzburger Strasse 45, 63743 Aschaffenburg, Germany. ralf.hellmann@h-ab.de.
authors: Ralf
authors: R
authors: Hellmann