Simultaneous measurement of external refractive index and temperature based on long-period-grating-inscribed Sagnac interferometer and fiber Bragg grating.
作者： Peng Gao , Xiuyan Chen , Wenjiang Feng
DOI: 10.1063/1.4758126
关键词: Refractive index 、 Interference (wave propagation) 、 Fiber Bragg grating 、 Wavelength 、 Astronomical interferometer 、 Interferometry 、 Optoelectronics 、 Materials science 、 Grating 、 Temperature measurement 、 Optics
摘要: A compact Sagnac interferometer with a long-period grating (LPG) inscribed in polarization-maintaining fiber (PMF-LPG) and Bragg (FBG) is proposed. The PMF-LPG intrinsically sensitive to the external refractive index (ERI) temperature, whereas FBG only temperature. Simultaneous measurement of ERI temperature can be achieved by detecting wavelength shifts interference patterns FBG. Because structure used, high sensitivity −21.07 nm/refractive unit range 1.33–1.43 obtained, which about three times higher than for normal LPG sensor.
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