Measurement of temperature and strain distribution by Brillouin frequency shift in silica optical fibers

摘要

This paper describes the principles and recent development of a new technique for measuring temperature and strain distribution using Brillouin backscattering rather than Rayleigh and Raman backscattering. The technique is based on temperature- and strain-induced changes in the Brillouin frequency shift. Experimental sensitivities of 1.2 MHz/K and 5.8 MHz/10$+$MIN@4$/ strain are demonstrated at a wavelength of 1.32 $mu@m. Two approaches for measuring the weak Brillouin line are discussed.