TOPAS-based humidity insensitive polymer planar Bragg gratings for temperature and multi-axial strain sensing

M. Rosenberger; S. Hessler; S. Belle; B. Schmauss; R. Hellmann

doi:10.1117/12.2075009

9 January 2015 TOPAS-based humidity insensitive polymer planar Bragg gratings for temperature and multi-axial strain sensing

M. Rosenberger, S. Hessler, S. Belle, B. Schmauss, R. Hellmann

Author Affiliations +

Proceedings Volume 9444, International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2014); 944408 (2015) https://doi.org/10.1117/12.2075009
Event: International Seminar on Photonics, Optics, and Applications 2014, 2014, Sanur, Bali, Indonesia

Abstract

We demonstrate the application of humidity insensitive polymer planar Bragg gratings written into planar TOPAS substrates for measuring temperature as well as multi-axial tensile and compressive strain. The polymer planar Bragg gratings are realized by a rapid fabrication process using a KrF excimer laser which illuminates a stacked mask configuration consisting of an amplitude mask and a phase mask with a grating period of 1036.79 nm. We determine the UV-induced refractive index modification of the integrated waveguide by phase shifting Mach Zehnder interferometry and investigate its light guiding properties. The integrated polymer planar Bragg grating (PPBG) reflects a wavelength of 1576.5 nm with a reflectivity of about 93% and shows almost no sensitivity against relative humidity. Therefore, the TOPAS-PPBG is well-suited for measuring temperature as well as tensile and compressive strain. Temperature measurements are feasible up to 116°C. An observed temperature hysteresis disappears after three consecutive temperature cycles, after which the TOPAS-PPBG is characterized by a sensitivity of -6.5 pm/°C. Furthermore, tensile and compressive strain is applied at different angles showing an angle-dependent sensitivity of the PPBG making it a suitable candidate for multi-axial strain sensing.

Citation Download Citation

M. Rosenberger, S. Hessler, S. Belle, B. Schmauss, and R. Hellmann "TOPAS-based humidity insensitive polymer planar Bragg gratings for temperature and multi-axial strain sensing", Proc. SPIE 9444, International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2014), 944408 (9 January 2015); https://doi.org/10.1117/12.2075009

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