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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

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

Revista

Título: Sensors and Actuators, B: Chemical

Vol. 188

Páginas: 1212-1217

ISSN: 0925-4005

Editora: Elsevier

Indexação

ISI Web of Knowledge - 42 Citações

Scopus - 47 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica