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

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Dias, B (Author) Other; de Almeida, JMMM (Author) FCUP; Coelho, LCC (Author) FCUP

Journal

Title: U.Porto Journal of Engineering

Vol. 8 No. 2

Pages: 2-6

Publisher: Universidade do Porto. Faculdade de Engenharia

Indexing

Scopus - 2 Citations

Other information

Authenticus ID: P-00W-NWV

DOI: 10.24840/2183-6493_008.003_0002

Abstract (EN): 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. © 2022, Universidade do Porto - Faculdade de Engenharia. All rights reserved.

Language: English

Type (Professor's evaluation): Scientific