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

• Type: Article in International Scientific Journal
• Date: 2013

Authors

gouveia, c (Author) Other; zibaii, m (Author) Other; latifi, h (Author) Other; marques, mjb (Author) FCUP; baptista, jm (Author) Other; jorge, pas (Author) FCUP

Journal

Title: Sensors and Actuators, B: Chemical

Vol. 188

Pages: 1212-1217

ISSN: 0925-4005

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 42 Citations

Scopus - 47 Citations

Other information

Authenticus ID: P-008-DSP

DOI: 10.1016/j.snb.2013.08.033

Abstract (EN): 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 Δn ≈ 1.46 × 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. © 2013 Elsevier B.V.

Language: English

Type (Professor's evaluation): Scientific