High resolution temperature independent refractive index measurement using differential white light interferometry

SENSORS AND ACTUATORS B-CHEMICAL

卷:188

Article

Gouveia, Carlos^1,2  Zibaii, Mohammad³  Latifi, Hamid³  Marques, Manuel J. B.⁴  Baptista, J. M.^1,2  Jorge, Pedro A. S.¹ 

[1] INESC Porto, P-4169007 Porto, Portugal

[2] Univ Madeira, Ctr Competencias Ciencias Exactas & Engn, P-9000390 Funchal, Portugal

[3] Shahid Beheshti Univ, Laser & Plasma Res Inst, Tehran, Iran

[4] FCUP, P-4169007 Porto, Portugal

关键词: Fiber optic sensors;    White light interferometry;    Differential measurement;    Virtual instrumentation;    Tapers;    Refractive index measurement;   

DOI  :  10.1016/j.snb.2013.08.033

来源: Elsevier

【 摘 要 】

In this work a fiber optic interferometric system for differential refractive index measurement is described. The system is based on a white light Mach-Zehnder configuration, with serrodyne phase modulation, used to interrogate two similar non-adiabatic tapered optical fiber sensors in a differential scheme. In this situation the system is able to measure the refractive index independent of temperature. Signal processing with low cost digital instrumentation developed in Labview environment allows a detectable change in refractive index of Delta n approximate to 1.46 x 10(-6), which is, from the best of our knowledge the highest resolution achieved using a bare fiber taper device for a range of refractive index close to the water index. The results demonstrate the potential of the proposed scheme to operate as a self-referenced chemical and biological sensing platform. (C) 2013 Elsevier B. V. All rights reserved.

【 授权许可】

Free