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

Sensors

Sang-Jin Choi¹  Young-Chon Kim³  Minho Song² 

[1] Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, Jeonbuk 561-756, Korea; E-Mail:;Division of Electronic Engineering, Chonbuk National University, Jeonju 561-756, Korea; E-Mail:;Department of IT Engineering and Smart Grid Research Center, Chonbuk National University, Jeonbuk 561-756, Korea; E-Mail:

关键词: fiber optic sensor;    self-referencing;    intensity-based FOS;    fiber Bragg grating;    multipoint sensing;   

DOI  :  10.3390/s140712803

来源: mdpi

【 摘 要 】

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, H_m,n, of the intensity-based FOS head. The self-referencing and multipoint sensing characteristics of the proposed system are validated by showing the measuredand 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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.