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Sensors 2014, 14(7), 12803-12815; doi:10.3390/s140712803
Article

A Self-Referencing Intensity-Based Fiber Optic Sensor with Multipoint Sensing Characteristics

1
, 2
, 3
 and 1,*
Received: 1 May 2014; in revised form: 5 July 2014 / Accepted: 14 July 2014 / Published: 18 July 2014
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Abstract: A self-referencing, intensity-based fiber optic sensor (FOS) is proposed and demonstrated. The theoretical analysis for the proposed design is given, and the validity of the theoretical analysis is confirmed via experiments. We define the measurement parameter, X, and the calibration factor, β, to find the transfer function, , of the intensity-based FOS head. The self-referencing and multipoint sensing characteristics of the proposed system are validated by showing the measured  and relative error versus the optical power attenuation of the sensor head for four cases: optical source fluctuation, various remote sensing point distances, fiber Bragg gratings (FBGs) with different characteristics, and multiple sensor heads with cascade and/or parallel forms. The power-budget analysis and limitations of the measurement rates are discussed, and the measurement results of fiber-reinforced plastic (FRP) coupon strain using the proposed FOS are given as an actual measurement. The proposed FOS has several benefits, including a self-referencing characteristic, the flexibility to determine FBGs, and a simple structure in terms of the number of devices and measuring procedure.
Keywords: fiber optic sensor; self-referencing; intensity-based FOS; fiber Bragg grating; multipoint sensing fiber optic sensor; self-referencing; intensity-based FOS; fiber Bragg grating; multipoint sensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Choi, S.-J.; Kim, Y.-C.; Song, M.; Pan, J.-K. A Self-Referencing Intensity-Based Fiber Optic Sensor with Multipoint Sensing Characteristics. Sensors 2014, 14, 12803-12815.

AMA Style

Choi S-J, Kim Y-C, Song M, Pan J-K. A Self-Referencing Intensity-Based Fiber Optic Sensor with Multipoint Sensing Characteristics. Sensors. 2014; 14(7):12803-12815.

Chicago/Turabian Style

Choi, Sang-Jin; Kim, Young-Chon; Song, Minho; Pan, Jae-Kyung. 2014. "A Self-Referencing Intensity-Based Fiber Optic Sensor with Multipoint Sensing Characteristics." Sensors 14, no. 7: 12803-12815.


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