Temperature independent refractive index measurement using white light interferometry

C. Gouveia; M. Zibaii; H. Latifi; M. J. Marques; J. M. Baptista; P. A. S. Jorge

doi:10.1117/12.975650

7 November 2012 Temperature independent refractive index measurement using white light interferometry

C. Gouveia, M. Zibaii, H. Latifi, M. J. Marques, J. M. Baptista, P. A. S. Jorge

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84216O (2012) https://doi.org/10.1117/12.975650
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

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, to interrogate two similar nonadiabatic tapered optical fiber sensors in a differential scheme. In this situation it is possible 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 Δn≈2x10^-6, which is, from the best of our knowledge the highest resolution achieved using a fiber taper device. The results demonstrate the potential of the proposed scheme to operate as chemical and biological sensing platform.

Citation Download Citation

C. Gouveia, M. Zibaii, H. Latifi, M. J. Marques, J. M. Baptista, and P. A. S. Jorge "Temperature independent refractive index measurement using white light interferometry", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216O (7 November 2012); https://doi.org/10.1117/12.975650

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