Staff directory Nathalie Braz Barroca

Nathalie Braz Barroca

Postdoctoral Researcher
Oxide Nanophysics



  • Optical Fiber Humidity Sensor Based on Polyvinylidene Fluoride Fabry-Perot

    Vaz A., Barroca N., Ribeiro M., Pereira A., Frazao O. IEEE Photonics Technology Letters; 31 (7, 8653388): 549 - 552. 2019. 10.1109/LPT.2019.2901571.

    An optical fiber Fabry-Perot (FP) for relative humidity (RH) sensing is proposed. The FP cavity is fabricated by splicing a short length of hollow silica tube in a single mode fiber. The fiber is then coated with a polyvinylidene fluoride (PVDF) thin film to work as a mirror. The fabrication process of the FP interferometer with a dip coating process in a PVDF/dimethyl formamide solution is presented. The pattern fringes of the FP suffer a wavelength shift due to the change in the PVDF's refractive index with the ambient RH variation. A short overview of the cavity's formation and stability is presented. The RH response of the FPI cavity is tested. The sensor presented a sensitivity of 32.54 pm/%RH at constant temperature and -15.2 pm/°C for temperature variation. © 1989-2012 IEEE.