High-temperature measurement with Brillouin optical time domain analysis of an annealed fused-silica single-mode fiber

摘要

The effect of annealing is experimentally studied for a fused silica, fully distributed fiber optic sensor based on the pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA). Within a heating rate of 4.3 degrees C/min and 30.6 degrees C/min, and a sustained peak temperature for 120 and 240 min, annealing extended the sensor's upper operation temperature from 800 degrees C to 1000 degrees C and reduced the sensor's measurement variability over a temperature range of 22 degrees C to 1000 degrees C with a maximum Brillouin frequency variation of 1%. The annealed sensor had a linearly decreasing Brillouin frequency sensitivity from 1.349 x 10(-3) GHz/degrees C at 22 degrees C to 0.419 x 10(-3) GHz/degrees C at 1000 degrees C. The time required to achieve a stable annealing effect decayed exponentially with annealing temperature. (C) 2016 Optical Society of America