1200°C high-temperature distributed Brillouin optical fiber sensing based on photonics crystal fiber

摘要

We demonstrate an up to 1200°C high-temperature distributed Brillouin sensing based on a pure-silica photonics crystal fiber. A Brillouin frequency shift (BFS) hopping is observed between 800°C-900°C for the first annealing process and after that the BFS exhibits the stability and repeatability with a measurement accuracy as high as ±2 °C . The BFS dependence on temperature in the range of room temperature to 1200°C agrees well with an exponential function instead of a linear function, which is mainly attributed by the change of the acoustic velocity in a silica fiber.