Optical Fiber Sensing System Based on Long-Period Gratings for Remote Refractive Index Measurement in Aqueous Environments |
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| Authors: | C. Silva João M. P. Coelho P. Caldas O. Frazão P. A. S. Jorge J. L. Santos |
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| Affiliation: | 1. Laboratório de óptica, Lasers e Sistemas, Faculdade de Ciências da Universidade de Lisboa , Lisboa, Portugal;2. Instituto de Engenharia de Sistemas e Computadores do Porto (INESC), Unidade de Optoelectrónica e Sistemas Electrónicos , Porto, Portugal;3. Departamento de Física , Faculdade de Ciências da Universidade do Porto , Porto, Portugal;4. Escola Superior de Tecnologia e Gest?o , Instituto Politêcnico de Viana do Castelo (IPVC) , Viana do Castelo, Portugal;5. Departamento de Física , Faculdade de Ciências da Universidade do Porto , Porto, Portugal;6. Instituto de Engenharia de Sistemas e Computadores do Porto (INESC), Unidade de Optoelectrónica e Sistemas Electrónicos , Porto, Portugal |
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| Abstract: | Abstract In the field of aqueous environment studies, long-period fiber gratings are very attractive for the real-time monitoring of physical parameters, such as temperature and salinity. However, due to the fiber jacket removal, these are fragile devices when applied in real conditions, where mechanical loads and contamination with algae and other organic materials must be taken into account. This work describes a refractive index sensing head that has been developed and characterized for in situ measurement of water salinity and resistance to hard conditions. |
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| Keywords: | fiber-optic sensors long-period gratings refractive index measurement |
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