RT info:eu-repo/semantics/conferenceObject T1 Highly sensitive distributed birefringence measurements based on a two-pulse interrogation of a dynamic Brillouin grating A1 Denisov, A. A1 Angulo Vinuesa, Xabier A1 Martín López, Sonia A1 Thévenaz, Luc A1 González Herráez, Miguel A1 Soto Hernández, Marcelo Alfonso K1 Birefringence K1 Brillouin scattering K1 Distributed fibre sensor K1 Fibre optics K1 Optical fibre sensors K1 Ciencias tecnológicas K1 Electrónica K1 Technology K1 Electronics AB A method for distributed birefringence measurements is proposed based on the interference pattern generated by the interrogation of a dynamic Brillouin grating (DBG) using two short consecutive optical pulses. Compared to existing DBG interrogation techniques, the method here offers an improved sensitivity to birefringence changes thanks to the interferometric effect generated by the reflections of the two pulses. Experimental results demonstrate the possibility to obtain the longitudinal birefringence profile of a 20 m-long Panda fibre with an accuracy of ∼10-8 using 16 averages and 30 cm spatial resolution. The method enables inf-metric and highly-accurate distributed temperature and strain sensing. PB SPIE SN 978-1-51061-091-0 SN 0277-786X YR 2017 FD 2017 LK http://hdl.handle.net/10017/30895 UL http://hdl.handle.net/10017/30895 LA eng DS MINDS@UW RD 29-mar-2024