As a key research material, graphene has high thermal expansion coefficient and heat conductivity. FBG with cladding by coated graphene can effectively improve temperature sensing characteristics according to the temperature sensing principle of FBG. Firstly, after removing the coating on FBG surface with acetone and stripping pliers, graphene nanosheets were deposited on the cladding material of FBG by a simple evaporative deposition method. The temperature sensing sensitivity 13.05 pm/°C was obtained in experiment after linear fitting of data, which was about 67% higher than that of bare FBG of 7.82pm/°C. Secondly, in order to improve the purity, compactness and controllable thickness of the coatings, we deposit graphene films of FBG cladding with coating process in vacuum by pulsed laser deposition (PLD) technology. Finally, the temperature sensing sensitivity of the FBG sensor coated with graphene thin film by PLD reached 17.31 pm/°C, which was about 120% higher than that before deposition. Moreover, the whole temperature sensing system of FBG with cladding graphene film has simple structure and high practicability

Date Published: 18 December 2019
PDF: 7 pages
Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 113400W (18 December 2019); doi: 10.1117/12.2547299

Published in SPIE Proceedings Vol. 11340:
AOPC 2019: Optical Fiber Sensors and Communication
Jie Zhang; Songnian Fu; Jun Yang, Editor(s)