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Sensors 2015, 15(7), 16516-16535; doi:10.3390/s150716516

FBG Interrogation Method with High Resolution and Response Speed Based on a Reflective-Matched FBG Scheme

Institute of Ultra-precision Optoelectronic Instrument Engineering, Science Park, Harbin Institute of Technology, No. 2 Yikuang Street, Nangang District, Harbin 150080, China
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 5 May 2015 / Revised: 30 June 2015 / Accepted: 30 June 2015 / Published: 8 July 2015
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, a high resolution and response speed interrogation method based on a reflective-matched Fiber Bragg Grating (FBG) scheme is investigated in detail. The nonlinear problem of the reflective-matched FBG sensing interrogation scheme is solved by establishing and optimizing the mathematical model. A mechanical adjustment to optimize the interrogation method by tuning the central wavelength of the reference FBG to improve the stability and anti-temperature perturbation performance is investigated. To satisfy the measurement requirements of optical and electric signal processing, a well- designed acquisition circuit board is prepared, and experiments on the performance of the interrogation method are carried out. The experimental results indicate that the optical power resolution of the acquisition circuit border is better than 8 pW, and the stability of the interrogation method with the mechanical adjustment can reach 0.06%. Moreover, the nonlinearity of the interrogation method is 3.3% in the measurable range of 60 pm; the influence of temperature is significantly reduced to 9.5%; the wavelength resolution and response speed can achieve values of 0.3 pm and 500 kHz, respectively. View Full-Text
Keywords: FBG interrogation method; reflective-matched FBG; high wavelength resolution; high response speed FBG interrogation method; reflective-matched FBG; high wavelength resolution; high response speed
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. (CC BY 4.0).

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MDPI and ACS Style

Cui, J.; Hu, Y.; Feng, K.; Li, J.; Tan, J. FBG Interrogation Method with High Resolution and Response Speed Based on a Reflective-Matched FBG Scheme. Sensors 2015, 15, 16516-16535.

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