scholarly journals U-Shaped Optical Fiber Probes Coated with Electrically Doped GQDs for Humidity Measurements

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2696
Author(s):  
Hsin-Yi Wen ◽  
Hsiang-Cheng Hsu ◽  
Yao-Tung Tsai ◽  
Wen-Kai Feng ◽  
Chih-Lang Lin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Fiber ◽  
Network Structure ◽  
Optical Sensors ◽  
Polymer Network ◽  
Graphene Quantum Dots ◽  
Polymer Materials ◽  
Fiber Sensor ◽  
Optic Fiber ◽  
Bending Radius

The influence of the bending radius on the sensitivity of the graphene quantum dots (GQDs)-coated probe is experimentally investigated for a U-shaped probe. The fiber is bent into a U shape using the optic fiber flame heating method, and the optic fiber is enclosed in a glass tube to increase the stability of the probe. The surface of the U-shaped optical fiber was coated with electrospun fibers formed via electrospinning. Polymer materials doped with GQDs are applied to U-shaped optical fiber as humidity sensors. Graphene quantum dot nanofibers on the U-shaped optical fiber sensor to form a network structure of graphene quantum dots U-shape fiber sensor (GQDUS). The polymer network structure absorbs water molecules, which in turn affects the bending radius of the optical fiber, and changes the optical fiber spectrum. Graphene quantum dots provide optical enhancement benefits, which in turn increase the sensitivity of fiber optic sensors. The spectra monitoring system consists of an optical spectrum analyzer (OSA) and an amplified spontaneous emission (ASE). This system can be used to detect humidity changes between 20% RH and 80% RH in the chamber. Our results indicate promising applications for quantum dots probe sensors from electrospun nanofibers increasing sensitive environmental monitoring. As such, it could be of substantial value in optical sensors detection.

scholarly journals Lard detection using a tapered optical fiber sensor integrated with gold-graphene quantum dots

2019 ◽  
Vol 26 ◽  
pp. 100306 ◽  
Author(s):  
C.N.H.C. Lah ◽  
N. Jamaludin ◽  
F.Z. Rokhani ◽  
S.A. Rashid ◽  
A.S.M. Noor
Keyword(s):  
Quantum Dots ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Graphene Quantum Dots ◽  
Fiber Sensor ◽  
Tapered Optical Fiber

Optical Fiber Fabry-Perot Humidity Sensor by Graphene Quantum Dots

2020 ◽  
Vol 49 (9) ◽  
pp. 906003-906003
Author(s):  
王宁 Ning WANG ◽  
田文昊 Wen-hao TIAN ◽  
张昊生 Hao-sheng ZHANG ◽  
于晓丹 Xiao-dan YU ◽  
尹晓蕾 Xiao-lei YIN ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Fiber ◽  
Humidity Sensor ◽  
Graphene Quantum Dots ◽  
Fabry Perot

scholarly journals Research on the estimation method of the point-of-interest (POI) displacement for ultra-precision flexible motion system based on functional optical fiber sensor

2021 ◽  
Vol 22 ◽  
pp. 48
Author(s):  
Yujie Li ◽  
Ming Zhang ◽  
Yu Zhu
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Estimation Method ◽  
Fiber Optic Sensor ◽  
Fiber Sensor ◽  
Optic Fiber ◽  
Estimation Model ◽  
Fiber Sensors ◽  
Optimal Position ◽  
Displacement Estimation

This paper proposes a POI displacement estimation method based on the functional optical fiber sensor and the phase modulation principle to improve the POI displacement estimation accuracy. First, the relation between the object deformation and the optic fiber lightwave phase is explained; the measurement principle of functional optical fiber sensor based on the heterodyne interference principle and its layout optimization method is proposed, and a POI displacement estimation model is presented based on the data approach. Secondly, a beam is taken as the simulation object, the optimal position and length of the optical fiber sensor are determined based on its simulation data. Finally, the experimental device is designed to verify the effectiveness of the POI displacement estimation method based on the optic fiber sensors. The frequency-domain plot of the signals shows that the optical fiber sensors can express the flexible deformation of the analyzed object well. The POI displacement estimation model with the fiber optic sensor signals as one of the inputs is constructed. Through estimating the test data, the error using the optical fiber sensor-based POI displacement estimation method proposed in this paper reduces by more than 61% compared to the rigid body-based assumption estimation method.

Experimental Research on Embankment Hidden Defects Monitoring Using Distributed Optical Fiber Sensor

2013 ◽  
Vol 351-352 ◽  
pp. 1183-1188 ◽  
Author(s):  
Yang Zhou ◽  
Ping Yu Zhu ◽  
Shu Yu Li
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Good Effect ◽  
Strain Identification ◽  
Embankment Dam ◽  
Long Distance ◽  
Distributed Optical Fiber Sensor ◽  
Bending Radius ◽  
Distributed Optical Fiber

Distributed optical fiber sensor for temperature and strain identification as the basis, the optical fiber sensor has advantages to monitor deformation and seepage in the embankment dam relying on its long distance and continuous monitoring ability. Taking layout of layered installation, the relationship between laying bending radius and the strain of the optical fiber sensor is studied. Indoor simulation test and local outdoor dam model test show that, the distributed optical fiber sensor for dam defect monitoring has good effect and application prospect. The embankment dam model provides experimental platform to further study early warning criterion of impending disaster in embankment dam.

A Supramolecular Polymer Network of Graphene Quantum Dots

2018 ◽  
Vol 130 (18) ◽  
pp. 5054-5058 ◽  
Author(s):  
Yuichiro Uemura ◽  
Kairi Yamato ◽  
Ryo Sekiya ◽  
Takeharu Haino
Keyword(s):  
Quantum Dots ◽  
Polymer Network ◽  
Graphene Quantum Dots ◽  
Supramolecular Polymer

scholarly journals An Easily Fabricated High Performance Fabry-Perot Optical Fiber Humidity Sensor Filled with Graphene Quantum Dots

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 806
Author(s):  
Ning Wang ◽  
Wenhao Tian ◽  
Haosheng Zhang ◽  
Xiaodan Yu ◽  
Xiaolei Yin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Relative Humidity ◽  
Optical Fiber ◽  
Optical Fibers ◽  
High Performance ◽  
Humidity Sensor ◽  
Graphene Quantum Dots ◽  
High Sensitivity ◽  
Single Mode ◽  
Fabry Perot

An easily fabricated Fabry-Perot optical fiber humidity sensor with high performance was presented by filling Graphene Quantum Dots (GQDs) into the Fabry-Perot resonator, which consists of two common single mode optical fibers. The relative humidity sensing performance was experimentally investigated by an interference spectrum drift between 11 %RH to 85 %RH. 0.567 nm/%RH sensitivity and 0.99917 linear correlation were found in experiments that showed high sensitivity, good and wide-range linear responding. Meanwhile, its good responding repeatability was demonstrated by two circle tests with increasing and decreasing relative humidity. For investigating the measurement influence caused by a temperature jitter, the temperature responding was experimentally investigated, which showed its linear responding with 0.033 nm/°C sensitivity. The results demonstrate the humidity sensitivity is greatly higher than the temperature sensitivity. The wavelength shift influence is 0.0198 nm with 0.6 °C max temperature jitter in the experiment, which can be ignored in humidity experiments. The fast-dynamic responses at typical humidity were demonstrated in experiments, with 5.5 s responding time and 8.5 s recovering time. The sensors with different cavity lengths were also investigated for their humidity response. All sensors gave good linear responding and high sensitivity. In addition, the relation curve between cavity length and response sensitivity also had good linearity. The combination of GQDs and single mode optical fibers showed easy fabrication and good performance for an optical fiber relative humidity sensor.

scholarly journals U-bent Plastic Optical Fiber for Lard Adulteration Sensor in Edible Oil

2021 ◽  
Vol 1 (1) ◽  
pp. 1-7
Author(s):  
Ika Puspita ◽  
Fredy Kurniawan ◽  
Agus Muhamad Hatta ◽  
Sekartedjo Koentjoro
Keyword(s):  
Optical Fiber ◽  
Olive Oil ◽  
Rapid Detection ◽  
Optical Fiber Sensor ◽  
Edible Oil ◽  
Fiber Sensor ◽  
Plastic Optical Fiber ◽  
Optimum Performance ◽  
Bending Radius

A plastic optical fiber with the structure of U-bent was utilized as a sensor to detect lard adulterants in olive oil. The macro bending was formed on the plastic optical fiber with a bending radius of 10 mm, 12.5 mm, and 15 mm. The output spectra and intensity were measured to detect the existence of lard substance in olive oil. The U-bent plastic optical fiber sensor with a bending radius of 12.5 mm has the optimum performance to detect the lard adulterant substance in olive oil. It has a sensitivity of 4.6 a.u/% with 855 nm LED source and 10.07 a.u/% with 940 nm LED source in intensity-based measurement and 0.50 nm/% in spectrum-based measurement. The proposed sensor is the potential to give rapid detection on lard adulterant in edible oil.

scholarly journals Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3850 ◽  
Author(s):  
Nur Ain Asyiqin Anas ◽  
Yap Wing Fen ◽  
Nur Alia Sheh Omar ◽  
Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽  
Nur Syahira Md Ramdzan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Optical Sensors ◽  
Metal Ion ◽  
Limit Of Detection ◽  
Graphene Quantum Dots ◽  
Toxic Metal ◽  
Human Beings ◽  
Toxic Metal Ions ◽  
Sensing Applications

About 71% of the Earth’s surface is covered with water. Human beings, animals, and plants need water in order to survive. Therefore, it is one of the most important substances that exist on Earth. However, most of the water resources nowadays are insufficiently clean, since they are contaminated with toxic metal ions due to the improper disposal of pollutants into water through industrial and agricultural activities. These toxic metal ions need to be detected as fast as possible so that the situation will not become more critical and cause more harm in the future. Since then, numerous sensing methods have been proposed, including chemical and optical sensors that aim to detect these toxic metal ions. All of the researchers compete with each other to build sensors with the lowest limit of detection and high sensitivity and selectivity. Graphene quantum dots (GQDs) have emerged as a highly potential sensing material to incorporate with the developed sensors due to the advantages of GQDs. Several recent studies showed that GQDs, functionalized GQDs, and their composites were able to enhance the optical detection of metal ions. The aim of this paper is to review the existing, latest, and updated studies on optical sensing applications of GQDs-based materials toward toxic metal ions and future developments of an excellent GQDs-based SPR sensor as an alternative toxic metal ion sensor.

Optical Fiber Sensor for Mercury Ion Detection Based on Quantum Dots and Evanescent Wave Sensing

2018 ◽  
Vol 38 (10) ◽  
pp. 1006008
Author(s):  
刘婷 Liu Ting ◽  
王文琪 Wang Wenqi ◽  
刘志群 Liu Zhiqun ◽  
易定容 Yi Dingrong
Keyword(s):  
Quantum Dots ◽  
Optical Fiber ◽  
Evanescent Wave ◽  
Optical Fiber Sensor ◽  
Mercury Ion ◽  
Fiber Sensor ◽  
Ion Detection ◽  
Mercury Ion Detection
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