Gas refractometry based on an all-fiber spatial optical filter

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Susana Silva (Autor) Outra; Coelho, L (Autor) FCUP; Andre, RM (Autor) Outra; Frazao, O (Autor) FCUP

Revista

Título: Optics Letters

Vol. 37

Páginas: 3450-3452

ISSN: 0146-9592

Editora: Optical Society of America

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 10 Citações

Outras Informações

ID Authenticus: P-002-6XQ

DOI: 10.1364/ol.37.003450

Abstract (EN): A spatial optical filter based on splice misalignment between optical fibers with different diameters is proposed for gas refractometry. The sensing head is formed by a 2 mm long optical fiber with 50 mu m diameter that is spliced with a strong misalignment between two single-mode fibers (SMF28) and interrogated in transmission. The misalignment causes a Fabry-Perot behavior along the reduced-size fiber and depending on the lead-out SMF28 position, it is possible to obtain different spectral responses, namely, bandpass or band-rejection filters. It is shown that the spatial filter device is highly sensitive to refractive index changes on a nitrogen environment by means of the gas pressure variation. A maximum sensitivity of -1390 nm/RIU for the bandpass filter was achieved. Both devices have shown similar temperature responses with an average sensitivity of 25.7 pm/degrees C. (C) 2012 Optical Society of America

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 3