Fiber optic hydrogen sensor based on an etched Bragg grating coated with palladium

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Coelho, L (Autor) Outra; de Almeida, JMMM (Autor) FCUP; Santos, JL (Autor) FCUP; Viegas, D (Autor) FCUP

Revista

Título: Applied Optics

Vol. 54

ISSN: 1559-128X

Editora: Optical Society of America

Indexação

ISI Web of Knowledge - 21 Citações

Outras Informações

ID Authenticus: P-00J-YWT

DOI: 10.1364/ao.54.010342

Abstract (EN): A study of a sensor for hydrogen (H-2) detection based on fiber Bragg gratings coated with palladium (Pd) with self-temperature compensation is presented. The cladding around the gratings was reduced down to 50 mu m diameter by a chemical etching process. One of the gratings was left uncoated, and the other was coated with 150 nm of Pd. It was observed that palladium hydride has unstable behavior in environments with high humidity level. A simple solution to overcome this problem based on a Teflon tape is presented. The sensing device studied was able to respond to H-2 concentrations in the range 0%-1% v/v at room temperature and atmospheric pressure, achieving sensitivities larger than 20 pm/% v/v. Considering H-2 concentrations in nitrogen up to 1%, the performance of the sensing head was characterized for different thicknesses of Pd coating ranging from 50 to 200 nm. (C) 2015 Optical Society of America

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7