Simultaneous Measurement of Strain (to 2000 (mu)(epsilon)) and Temperature (to 600 deg C) Using a Combined Sb-Er-Ge-Codoped Fiber-Fluorescence and Grating-Based Technique

摘要

An optical fiber-based sensing scheme for the simultaneous measurement of strain and temperature over a wider range has been demonstrated by writing a grating with very high reflectivity in a 10-cm-long specially fabricated antimony-erbium-germanium (Sb-Er-Ge)-doped silica fiber. The scheme exploits the grating sensitivity to both strain and temperature in association with the temperature-dependent peak power ratio of the two fluorescence peaks around 1535 and 1552 nm of the amplified spontaneous emission due to ~(4)I_(13/2) -> ~(4)I_(15/2) transition arising from the presence of erbium ions in the fiber core, using a 980-nm laser diode as a pumping source. The sensor created using this fiber can be used for the simultaneous measurement of strain and temperature over the wide ranges of 0-2000 (mu)(epsilon) and 20 deg C-600 deg C, with root-mean-square errors of 36 (mu)(epsilon) and 2.8 deg C, respectively.