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Sensors 2016, 16(12), 2040;

Femtosecond Laser Ablated FBG with Composite Microstructure for Hydrogen Sensor Application

National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China
Authors to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 27 October 2016 / Revised: 25 November 2016 / Accepted: 29 November 2016 / Published: 1 December 2016
(This article belongs to the Section Chemical Sensors)
Full-Text   |   PDF [2487 KB, uploaded 1 December 2016]   |  


A composite microstructure in fiber Bragg grating (FBG) with film deposition for hydrogen detection is presented. Through ablated to FBG cladding by a femtosecond laser, straight-trenches and spiral micro-pits are formed. A Pd–Ag film is sputtered on the surface of the laser processed FBG single mode fiber, and acts as hydrogen sensing transducer. The demonstrated experimental outcomes show that a composite structure produced the highest sensitivity of 26.3 pm/%H, nearly sevenfold more sensitive compared with original standard FBG. It offers great potential in engineering applications for its good structure stability and sensitivity. View Full-Text
Keywords: fiber optics sensor; thin films; laser materials processing fiber optics sensor; thin films; laser materials processing

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Zou, M.; Dai, Y.; Zhou, X.; Dong, K.; Yang, M. Femtosecond Laser Ablated FBG with Composite Microstructure for Hydrogen Sensor Application. Sensors 2016, 16, 2040.

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