Optical coatings on fiber for relative-humidity sensing applications
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摘要:
A fiber-optic relative-humidity (RH) sensor composed of multilayer of porous dielectric films is proposed.The transducer deposited on fiber end-face is multilayer coating consisting of nano-porous TiO2 and SiO2films,which forms a low-fineness Fabry-Perot (F-P) filter with one of minimum reflections at about 1 350-nm wavelength.The dielectric thin films realized by e-beam evaporation without ion-source assistance have columnar and porous structures,which exhibit sensitivity to RH change of environments.When the sensor is exposed to an environment of RH change from 10.9% to 92.8%,experimental results demonstrate 77.9-nm shift of characteristic wavelength.