New Spatial Optical Filters for Gas Refractometry

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2012

Autores

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

Ata de Conferência Internacional

Título: 22ND INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS, PTS 1-3

22nd International Conference on Optical Fiber Sensors (OFS)

Beijing, PEOPLES R CHINA, OCT 15-19, 2012

Indexação

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Outras Informações

ID Authenticus: P-002-EEP

DOI: 10.1117/12.974991

Abstract (EN): A spatial optical filter based on splice misalignment between optical fibers with different cladding dimensions is proposed for gas refractometry. The sensing head is formed by a 2 mm-long optical fiber with 50 mu m diameter spliced with a strong misalignment between two single mode fibers (SMF28) and interrogated in transmission. This fiber structure causes a Fabry-Perot-behavior along the reduced-size fiber giving at its output end a well defined spatial filtering selectivity. Depending on the misalignment position of the lead-out SMF28, it is possible to obtain two different spectral responses, namely, bandpass or band-rejection filters. It is shown that this filter device is highly sensitive to refractive index changes on a nitrogen (N-2) environment by means of the gas pressure variation. A maximum sensitivity of -1390 nm/RIU for the bandpass filter was achieved.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4