Optical fiber relative-humidity sensor with evaporated dielectric coatings on fiber end-face |
| |
| Affiliation: | 1. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China;2. Institute of Structural Mechanics, CAEP, 621900 MianYang, Sichuan, China;1. Instituto de Telecomunicações, 3810-193 Aveiro, Portugal;2. QOPNA, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal;1. Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan;2. Information and Communications Research Laboratories, Industrial Technology Research Institute (ITRI), Chutung, Hsinchu 31040, Taiwan;3. Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, New Taipei 24205, Taiwan;4. Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong;1. School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China;2. School of Physics and Electronic Engineering, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, China;1. Telecommunications Laboratory (LABTEL), Federal University of Espírito Santo, Fernando Ferrari Avenue, 29075-910 Vitória, ES, Brazil;2. Physics Department & I3N, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal |
| |
| Abstract: | An optical fiber relative-humidity sensor (OFRHS) with evaporated dielectric coatings is proposed and demonstrated. The sensitive coatings, composed of multilayers of Ti3O5 and SiO2, form an extrinsic Fabry–Perot cavity on the distal end of the multimode fiber. As the effective refractive index of the porous coatings were correlated with the change of ambient Relative-humidity (RH), which will at last result in the shift of interference fringe. By monitoring the drift of reflected interference fringe under different RH levels, the information about RH of the environment under test can be extracted. Experimental results show that the average sensitivity is 0.43 nm/% RH when environmental RH changes from 1.8% RH to 74.7% RH. The proposed sensor was proved to be high repeatability, little hysteresis and especially highly sensitive to lower moisture measure. |
| |
| Keywords: | Optical fiber sensor Relative-humidity Electron beam evaporation Porous films |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
