Photonic crystal fiber interferometer coated with a PAH/PAA nanolayer as humidity sensor
Fecha
2017Autor
Versión
Acceso cerrado / Sarbide itxia
Tipo
Artículo / Artikulua
Impacto
|
10.1016/j.snb.2016.09.144
Resumen
In this paper, an optical fiber interferometric humidity sensor is presented. The device consists of 1 cmlong segment of photonic crystal fiber (PCF) spliced to standard single mode fibers (SMFs), forming an
interferometer: the two collapsed interfaces between PCF and SMF segments produce the excitation and
recombination of core and cladding modes. The latter interact with a poly(allylamine hyd ...
[++]
In this paper, an optical fiber interferometric humidity sensor is presented. The device consists of 1 cmlong segment of photonic crystal fiber (PCF) spliced to standard single mode fibers (SMFs), forming an
interferometer: the two collapsed interfaces between PCF and SMF segments produce the excitation and
recombination of core and cladding modes. The latter interact with a poly(allylamine hydrochloride)
(PAH) and poly(acrylic acid) (PAA) polymeric nanocoating deposited on the PCF by the well-established
layer-by-layer nano assembly (LbL) technique. Humidity modifies the index of the polymeric nanolayer
which in turns alters the cladding modes along the PCF segment and causes a detectable shift to the
interference pattern. A study of different nanocoting thicknesses is presented in order to obtain the best
possible sensibility for the sensor. Furthermore, the interrogation of the humidity sensor is presented
not only by the conventional study of the spectrum shift amplitude, but also making use of the Fast
Fourier Transform (FFT), which yields a linearization of the device response. The sensor here presented
is reproducible, can resolve 0.074% of relative humidity (RH) and operates in the 20–95% RH range.
Moreover, it exhibits response time of 0.3 s, a negligible cross sensitivity to temperature as well as long
term stability. [--]
Materias
Photonic crystal fiber,
Interferometer,
Layer-by-layer nanoassembly,
Humidity sensor,
Fast Fourier transform
Editor
Elsevier
Publicado en
Sensors and Actuators B 242 (2017 ) 1065-1072
Notas
Alojado según Res. CNEAI 5/12/23
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila /
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. Institute of Smart Cities - ISC
Versión del editor
Entidades Financiadoras
This work was supported by the Spanish Economy and Competitivity Ministry-FEDER TEC2013-43679-R.