scholarly journals High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1134
Author(s):  
Fang Wang ◽  
Bowen Wang ◽  
Xuhui Zhang ◽  
Mengdi Lu ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
Humidity Sensor ◽  
3D Structure ◽  
Detection Sensitivity ◽  
Complex Dielectric Constant ◽  
Bragg Grating ◽  
Nano Materials ◽  
Detection Range ◽  
Hybrid Nanomaterial

A high performance humidity sensor using tilted fiber Bragg grating (TFBG) and functional graphene oxide (GO)/multi-walled carbon nanotubes (MWCNTs) hybrid nano-materials was proposed. The humidity-sensitive material with three-dimensional (3D) structure was synthesized by the MWCNTs and GOs. Comparing with traditional two dimensional (2D) GOs film, water molecules could be absorbed effectively due to the larger ripples and more holes in GO/MWCNTs layers. The water molecule will fill the entire space in the 3D structure instead of air, which further enhances the absorption efficiency of the hybrid nanomaterial. TFBG as a compact and robust surrounding complex dielectric constant sensing platform was utilized. The mode coupling coefficient or the amplitude of TFBG cladding mode will vary sharply with the imaginary part of permittivity of the hybrid nanomaterial, realizing the high performance RH sensing. In the experiments, we successfully demonstrated that this 3D structural nanomaterial composed by the MWCNTs and GOs has significant advantages for expanding the range of humidity detection (range from 30% to 90%) and enhancing the detection sensitivity (0.377 dB/% RH is twice more than humidity sensor with 2D GO film). The TFBG-based RH sensor also exhibits good repeatability and stability. Our proposed humidity sensor has potential application in environmental and healthy monitoring fields.

High-performance humidity sensor based on a micro-nano fiber Bragg grating coated with graphene oxide

2020 ◽  
Vol 28 (18) ◽  
pp. 26395
Author(s):  
Meng Tian ◽  
Yanhua Huang ◽  
Cong Li ◽  
Min Lv
Keyword(s):  
Graphene Oxide ◽  
Fiber Bragg Grating ◽  
High Performance ◽  
Humidity Sensor ◽  
Bragg Grating ◽  
Nano Fiber

Relative Humidity Sensor Based on Tilted Fiber Bragg Grating With Polyvinyl Alcohol Coating

2009 ◽  
Vol 21 (7) ◽  
pp. 441-443 ◽  
Author(s):  
Yinping Miao ◽  
Bo Liu ◽  
Hao Zhang ◽  
Yuan Li ◽  
Haibin Zhou ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Polyvinyl Alcohol ◽  
Fiber Bragg Grating ◽  
Humidity Sensor ◽  
Bragg Grating ◽  
Relative Humidity Sensor

Early-Age Autogenous Shrinkage of High-Performance Concrete Columns by Embedded Fiber Bragg-Grating Sensor

2009 ◽  
Vol 419-420 ◽  
pp. 1-4 ◽  
Author(s):  
Ying Wei Yun ◽  
Ii Young Jang ◽  
Seong Kyum Kim ◽  
Seung Min Park
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Autogenous Shrinkage ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Early Age ◽  
Long Time ◽  
Sensor Temperature

High-performance concrete (HPC) as a promising construction material has been widely used in infrastructures and high-rise buildings etc. However, its pretty high autogenous shrinkage (AS) especially in its early age becomes one of the key problems endangering long-time durability of HPC structures. This paper carried out the early age AS research of large scaled HPC column specimens by embedded Fiber Bragg-Grating (FBG) strain sensor. Temperature compensation for FBG strain sensor by thermocouple was also attempted in this paper, and the results were reasonable and acceptable comparing with the result compensated by FBG temperature sensor. Reinforcement influence, size effect and temperature effect on HPC AS were also analyzed respectively in this paper.

scholarly journals Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5469
Author(s):  
Xiuxiu Xu ◽  
Mingming Luo ◽  
Jianfei Liu ◽  
Nannan Luan
Keyword(s):  
Fiber Bragg Grating ◽  
Humidity Sensor ◽  
Field Tests ◽  
Polyimide Film ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Sensing Applications ◽  
Fluorinated Polyimide ◽  
Temperature And Humidity ◽  
Fluoride Doping

We propose and demonstrate a temperature and humidity sensor based on a fluorinated polyimide film and fiber Bragg grating. Moisture-induced film expansion or contraction causes an extra strain, which is transferred to the fiber Bragg grating and leads to a humidity-dependent wavelength shift. The hydrophobic fluoride doping in the polyimide film helps to restrain its humidity hysteresis and provides a short moisture breathing time less than 2 min. Additionally, another cascaded fiber Bragg grating is used to exclude its thermal crosstalk, with a temperature accuracy of ±0.5 °C. Experimental monitoring over 9000 min revealed a considerable humidity accuracy better than ±3% relative humidity, due to the sensitized separate film-grating structure. The passive and electromagnetic immune sensor proved itself in field tests and could have sensing applications in the electro-sensitive storage of fuel, explosives, and chemicals.

A fast response intrinsic humidity sensor based on an etched singlemode polymer fiber Bragg grating

2013 ◽  
Vol 203 ◽  
pp. 107-111 ◽  
Author(s):  
Ginu Rajan ◽  
Yusof Mohd Noor ◽  
Bing Liu ◽  
Eliathamby Ambikairaja ◽  
David J. Webb ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Humidity Sensor ◽  
Fast Response ◽  
Bragg Grating ◽  
Polymer Fiber

scholarly journals Fiber Bragg grating modeling, simulation and characteristics with different grating lengths

2007 ◽  
Vol 3 (2) ◽  
Author(s):  
Ho Sze Phing ◽  
Jalil Ali ◽  
Rosly Abdul Rahman ◽  
Bashir Ahmed Tahir
Keyword(s):  
Fiber Bragg Grating ◽  
Matrix Method ◽  
High Performance ◽  
Fiber Bragg Grating Sensor ◽  
Critical Parameters ◽  
Bragg Grating ◽  
Fiber Gratings ◽  
Coupled Mode ◽  
High Performance Fiber ◽  
Bragg Grating Sensor

In this paper we perform a simulation of fiber Bragg grating sensor with different grating lengths. It is shown that the grating length represents as one of the critical parameters in contributing to a high performance fiber Bragg grating sensor. The simulated fiber gratings with different lengths were analyzed and designed by calculating reflection and transmission spectra, and the bandwidth. Such simulations are based on solving coupled mode equations that describe the interaction of guided modes. The coupled mode equations are solved by the Transfer Matrix Method (a fundamental matrix method).

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