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

被引：30

作者：

Viegas, Diana ^{[1
,2
]}

Goicoechea, Javier ^{[3
]}

Santos, Jose Luis ^{[1
,2
]}

Araujo, Francisco Moita ^{[2
]}

Ferreira, Luis Alberto ^{[2
]}

Arregui, Francisco J. ^{[3
]}

Matias, Ignacio R. ^{[3
]}

机构：

[1] Univ Porto, Fac Ciencias, P-4169007 Oporto, Portugal

[2] INESC Porto, P-4200465 Oporto, Portugal

[3] Univ Publ Navarra, Pamplona 31006, Spain

来源：

SENSORS | 2009年 / 9卷 / 01期

关键词：

Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly;

D O I：

10.3390/s90100519

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

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%.

引用

页码：519 / 527

页数：9

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