Enhancing the humidity response time of polymer optical fiber Bragg grating by using laser micromachining

Chen, X.F. and Zhang, W. and Liu, C. and Hong, Y. and Webb, D.J. (2015) Enhancing the humidity response time of polymer optical fiber Bragg grating by using laser micromachining. Optics Express, 23 (20). pp. 25942-25949. DOI: 10.1364/OE.23.025942

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The humidity sensors constructed from polymer optical fiber Bragg gratings (POFBG) respond to the water content change in the fiber induced by varying environmental condition. The water content change is a diffusion process. Therefore the response time of the POFBG sensor strongly depends on the geometry and size of the fiber. In this work we investigate the use of laser micromachining of D-shaped and slotted structures to improve the response time of polymer fiber grating based humidity sensors. A significant improvement in the response time has been achieved in laser micromachined D-shaped POFBG humidity sensors. The slotted geometry allows water rapid access to the core region but this does not of itself improve response time due to the slow expansion of the bulk of the cladding. We show that by straining the slotted sensor, the expansion component can be removed resulting in the response time being determined only by the more rapid, water induced change in core refractive index. In this way the response time is reduced by a factor of 2.5.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Electronic Engineering
Date Deposited: 23 Dec 2015 03:48
Last Modified: 23 Dec 2015 03:48
ISSN: 1094-4087
URI: http://e.bangor.ac.uk/id/eprint/6035
Identification Number: DOI: 10.1364/OE.23.025942
Publisher: Optical Society of America
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