Sensors | |
Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating | |
Diana Viegas2  Javier Goicoechea1  José Luís Santos2  Francisco Moita Araújo3  Luís Alberto Ferreira3  Francisco J. Arregui1  | |
[1] Universidad Pública de Navarra, Campus Arrosadia, 31006 Pamplona, Spain; E-Mails:;Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal;INESC Porto, Rua Dr. Roberto Frias, 378, 4200-465 Porto, Portugal; E-Mails: | |
关键词: Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly; | |
DOI : 10.3390/s90100519 | |
来源: mdpi | |
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【 摘 要 】
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%.
【 授权许可】
CC BY
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.
【 预 览 】
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RO202003190057297ZK.pdf | 292KB | ![]() |