Acta Photonica Sinica, Volume. 46, Issue 10, 1006002(2017)
Bend Vector Sensor Based on Long Period Fiber Grating Inscribed in Mismatched Twin Core Fiber
A long period fiber grating bend sensor was fabricated in mismatched twin core fiber by CO2 laser irradiation. Theoretical analysis indicate that the fiber core located at the edge of the cladding greatly enhances the residual stress. Under CO2 laser exposure,the long period fiber grating experiences a high quality. Moreover, the fiber grating is sensitive to polorization property due to the asymmetrical structure, the polarization dependent loss value of the long period fiber grating is as high as 20.8dB at the resonant wavelength of 1 553.3 nm. Sensing experiment reveals that it can distinguish the orientation of the curvature by the resonant peak showing a red or blue shift. The fiber grating experiences significant sensitivities of 2.37 nm/m-1 and 1.80 nm/m-1 with the micro-bending range of 0~1.235m-1 for +y and -y axis directions. The proposed sensor has the advantages of simple structure and high sensitivity. It could be used in struction health monitoring applications including roads and bridges.
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WANG Biao, PANG Lu, ZHANG Wei-gang, LIANG Xiao-hong, NING Ding, GENG Peng-cheng. Bend Vector Sensor Based on Long Period Fiber Grating Inscribed in Mismatched Twin Core Fiber[J]. Acta Photonica Sinica, 2017, 46(10): 1006002
Received: Dec. 7, 2016
Accepted: --
Published Online: Nov. 24, 2017
The Author Email: Biao WANG (biao_wang@126.com)