Abstract

we report a sapphire Fabry-Perot cavity based fibre optical temperature sensor that is capable of operating at elevated temperatures > 1000°C for prolonged periods of time. The sensing cavity is mounted at the front end of an extended alumina tube and is illuminated by a collimated light beam, thus separating the hot zone from the optical fibre lead. Stability to ±1°C at 1100°C over 42days has been demonstrated, together with a resolution < 0.5°C at 1300°C.

© 2018 The Author(s)