Combined regenerated fibre Bragg gratings and Fabry-Perot etalons for dual strain and temperature sensing

Publisher:
SPIE
Publication Type:
Conference Proceeding
Citation:
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 2015, 9634
Issue Date:
2015-01-01
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© 2015 SPIE. A highly integrated fibre-optic sensor with regenerated fibre Bragg grating (RFBG) and a micro Fabry-Pérot (MFP) is proposed and demonstrated for simultaneous measurement of temperature and strain under high temperature ( > 600°C). The MFP is fabricated by using a 157 nm fluorine gas (F 2 ) laser to micromachine the core of a standard optical fibre. The RFBG is fabricated by regenerating a seed grating written over the Fabry-Pérot. Since the MFP and RFBG have different sensitivity coefficients, their combination can be used to realise simultaneous measurement of temperature and strain. It is believed that such a high-temperature strain sensor could find important applications in many areas where simultaneous measurement of temperature and strain under high temperature is required.
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