Sensors 2009, 9(1), 519-527; doi:10.3390/s90100519
Article

Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating

1,2,* email, 3email, 1,2email, 2email, 2email, 3email and 3email
Received: 29 October 2008; in revised form: 19 December 2008 / Accepted: 15 January 2009 / Published: 16 January 2009
(This article belongs to the Special Issue Nanotechnological Advances in Biosensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: This work addresses a new configuration that improves the sensitivity of a humidity sensor based on a long-period fiber grating coated with a SiO2-nanospheres film. An intermediate higher refractive index overlay, deposited through Electrostatic Self-Assembly, is placed between the fiber cladding and the humidity sensitive film in order to increase the total effective refractive index of the coating. With this intermediate design, a three-fold improvement in the sensitivity was obtained. Wavelength shifts up to 15 nm against 5 nm were achieved in a humidity range from 20% to 80%.
Keywords: Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly
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MDPI and ACS Style

Viegas, D.; Goicoechea, J.; Santos, J.L.; Araújo, F.M.; Ferreira, L.A.; Arregui, F.J.; Matias, I.R. Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating. Sensors 2009, 9, 519-527.

AMA Style

Viegas D, Goicoechea J, Santos JL, Araújo FM, Ferreira LA, Arregui FJ, Matias IR. Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating. Sensors. 2009; 9(1):519-527.

Chicago/Turabian Style

Viegas, Diana; Goicoechea, Javier; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luís Alberto; Arregui, Francisco J.; Matias, Ignacio R. 2009. "Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating." Sensors 9, no. 1: 519-527.

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