Abstract

We report on a new optical strain sensor based on a polymer planar Bragg grating (PPBG). The sensor consists of commercially available bulk Polymethlymethacrylate with a UV-inscribed optical waveguide as well as a Bragg grating, both of which are fabricated simultaneously in a single writing step. Upon axial strain, the Bragg wavelength reveals a quasi-instantaneous spectral red shift that depends linearly on the mechanical load with a sensitivity of $2.95\mathrm{pm}/\mathrm{\mu \epsilon }$. The relative reflected intensity of the PPBG remains constant in the investigated load region.

© 2013 Optical Society of America

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