Long-Period Fiber Gratings Coated with Poly(ethylene glycol) as Relative Humidity Sensors

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B. Dias
J. M. M. M. de Almeida
Luís C. C. Coelho

Abstract

Relative humidity is an important parameter in controlled environments and is typically monitored using low-cost electrochemical sensors with low resolution and accuracy. This kind of sensors cannot not be implemented in harsh or explosive environments (as in pyrotechnic facilities) due to electrical discharges, or in marine structures where the oxidation of the sensing probe materials changes the sensing response). In these cases, fiber optic sensors can provide solutions due to their intrinsic properties, such as immunity to electromagnetic interference and resistance in harsh environments. This work presents preliminary results regarding the steps of the fabrication of Long-Period Fiber Gratings, the coating processes with a thin layer of poly(ethylene glycol) (PEG) and its sensing performance to relative humidity, displaying a from 60 to 100%sensitivity of 0.6 nm/%RH in the range of 80 to 100%RH.

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Author Biographies

B. Dias, INESC TEC, Centre of Applied Photonics; Faculty of Sciences, University of Porto

INESC TEC, Centre of Applied Photonics

Rua do Campo Alegre 687

4169-007 PORTO

Portugal

 

Department of Physics and Astronomy

Faculty of Sciences

University of Porto

Rua do Campo Alegre

4169-007 PORTO

Portugal

J. M. M. M. de Almeida, INESC TEC, Centre of Applied Photonics; School of Science and Technology, University of Trás-os-Montes e Alto Douro

INESC TEC, Centre of Applied Photonics

Rua do Campo Alegre 687

4169-007 PORTO

Portugal

 

Department of Physics

School of Science and Technology

University of Trás-os-Montes e Alto Douro

5001-801 VILA REAL

Portugal

Luís C. C. Coelho, INESC TEC, Centre of Applied Photonics; Faculty of Sciences, University of Porto

INESC TEC, Centre of Applied Photonics

Rua do Campo Alegre 687

4169-007 PORTO

Portugal

 

Department of Physics and Astronomy

Faculty of Sciences

University of Porto

Rua do Campo Alegre

4169-007 PORTO

Portugal