Dear colleagues, maybe our team missed some important thing, but in two our works we have some results that look controversal. The first one includes the study, where we probed a PM fiber using linear polatized light and the commercial BOTDA and confirmed the well-known fact that the BFSs' temperature response of 2 axes differ. Of course, you know that this phenomena found its aplication in temperature and strain discrimination in fiber optic sensors. We can not attach the full text here, but I'm not sure if it's needed 'cause these results look realistic. Anyway, here is the paper:
https://www.researchgate.net/publication/343276603_Theoretical_and_Experimental_Estimation_of_the_Accuracy_in_Simultaneous_Distributed_Measurements_of_Temperatures_and_Strains_in_Anisotropic_Optical_Fibers_Using_Polarization-Brillouin_Reflectometry
Then, we have tried to obtain similar results by using the single-shot, or 'single-scan' technique, that allowed us to see the both axes at a single BOTDA trace. But after that we found out that these axes have the same temperature response... and it looks strange. The more details are here:
https://www.researchgate.net/publication/356812453_Distributed_single-shot_investigation_of_polarization_axes_in_anisotropic_optical_fibers
Dear colleagues, maybe you know why it happens this way? Thank you for your response in advance.
#fiber #optic #sensors
#brillouin #frequency #shift
#polarization #maintaining #fiber
#temperature #strain #discrimination
Dear Prof. Vincent Lecoeuche , thank you so much for your answer and for your ideas! Yes, all these things may affect. That was just a simple trial to test the this approach and sure, we need to simulate such kind of effects first.
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