Abstract
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°C/min and 30.6°C/min, and a sustained peak temperature for 120 and 240 min, annealing extended the sensor's upper operation temperature from 800°C to 1000°C and reduced the sensor's measurement variability over a temperature range of 22°C to 1000°C with a maximum Brillouin frequency variation of 1%. The annealed sensor had a linearly decreasing Brillouin frequency sensitivity from 1.349 × 10-3 GHz/°C at 22°C to 0.419 × 10-3 GHz/°C at 1000°C. The time required to achieve a stable annealing effect decayed exponentially with annealing temperature.
Original language | English |
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Pages (from-to) | 3177-3180 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 41 |
Issue number | 14 |
DOIs | |
State | Published - 15 Jul 2016 |