Discrimination between refractive index and temperature by two cascaded cladding-mode type fiber sensors

2012 ◽  
Author(s):  
Meng Jiang ◽  
Perry Ping Shum ◽  
Zhi Fang Wu ◽  
Xuan Quyen Dinh ◽  
Dora Juan Juan Hu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Sensors ◽  
Cladding Mode ◽  
Type Fiber

scholarly journals Simultaneous Measurement of Refractive Index and Flow Rate Using a Co2+-Doped Microfiber

2021 ◽  
Vol 11 (22) ◽  
pp. 10525
Author(s):  
Da Liu ◽  
Ran Gao ◽  
Zhipei Li ◽  
Anle Qi
Keyword(s):  
Refractive Index ◽  
Flow Rate ◽  
Core Mode ◽  
Measurement Sensitivity ◽  
Resonant Modes ◽  
Cladding Mode ◽  
Bragg Grating Sensor ◽  
Maximum Measurement ◽  
Index Unit ◽  
Surrounding Liquid

This paper has proposed and experimentally demonstrated an integrated Co2+-doped microfiber Bragg grating sensor (Co-MFBGS) that can measure the surrounding liquid refractive index (LRI) and liquid flow rate (LFR) simultaneously. The Co-MFBGS provides well-defined resonant modes of core and cladding in the reflection spectrum. By monitoring the wavelength of the cladding mode, the LRI can be measured; meanwhile, by monitoring the wavelength of the core mode caused by the heat exchange, the LFR can be measured. The LRI and LFR can be distinguished by the wavelength separation between cladding mode and core mode. The experimental results show that in aqueous glycerin solution, the maximum measurement sensitivity for LRI detection is −7.85 nm/RIU (refractive index unit), and the LFR sensitivity is −1.93 nm/(μL/s) at a flow rate of 0.21 μL/s.

scholarly journals Simultaneous Plasmonic Measurement of Refractive Index and Temperature Based on a D-Type Fiber Sensor With Gold Wires

2017 ◽  
Vol 17 (8) ◽  
pp. 2439-2446 ◽  
Author(s):  
Diego Felipe Santos ◽  
Ariel Guerreiro ◽  
Jose Manuel Baptista
Keyword(s):  
Refractive Index ◽  
Fiber Sensor ◽  
Gold Wires ◽  
Type Fiber

Fabrication of Optical Fiber Sensors Based on Femtosecond Laser Micro Machining

2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Fengfeng Zhou ◽  
Seunghwan Jo ◽  
Xingyu Fu ◽  
Jung-Ting Tsai ◽  
Martin Byung-Guk Jun
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Refractive Index Change ◽  
Optical Fiber Sensors ◽  
Objective Lens ◽  
Machining Parameters ◽  
Fiber Sensors ◽  
The Core ◽  
First Time

Abstract In this research, we proposed fabrication process of optical fiber sensors using femtosecond laser and their applications. A beam of femtosecond laser was focused by an objective lens in the optical fiber. By testing different conditions, a group of machining parameters was found that achieve a minimum machining resolution of 3.2 μm. To ablate the core of the optical fiber, which is buried deep inside the cladding, precisely, part of the cladding was removed to expose the core as close as possible to the air. By making a complex pattern to modify the optical path of the laser inside an optical fiber, a sensitivity of 942.8–1015.6 nm per refractive index unit (nm/RIU) was obtained for liquid refractive index sensing. For another sensor, a sensitivity of 1.38 × 105 nm/RIU was obtained, which is high enough to detect small amount of refractive index change of air. It is known to be the first time that we fabricated a complex microstructure in an optical fiber to modify the propagation of the light using femtosecond laser. This research shows the possibility of a complex modification of light in an optical fiber using laser machining.

Refractive index and temperature sensor based on cladding-mode Bragg grating excited by abrupt taper interferometer

2013 ◽  
Vol 11 (12) ◽  
pp. 120604-120607 ◽  
Author(s):  
Shen Yang Shen Yang ◽  
Hao Sun Hao Sun ◽  
Liutong Yuan Liutong Yuan ◽  
Xiaolei Zhang Xiaolei Zhang ◽  
Libin Zhou Libin Zhou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Temperature Sensor ◽  
Bragg Grating ◽  
Cladding Mode

scholarly journals Temperature-Insensitive Refractive Index Sensor with Etched Microstructure Fiber

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3749 ◽  
Author(s):  
Bin Dai ◽  
Xiang Shen ◽  
Xiongwei Hu ◽  
Luyun Yang ◽  
Haiqing Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Low Temperature ◽  
Extinction Ratio ◽  
Refractive Index Sensor ◽  
Large Mode Area ◽  
Pure Silica ◽  
Microstructure Fiber ◽  
Cladding Mode ◽  
Mode Area ◽  
Sensing Characteristics

A Mach–Zehnder interferometer (MZI) based on an etched all-solid microstructure fiber (MOF) has been demonstrated. The MZI works on the basis of interference between the vibrant core and cladding modes in the MOF. The all-solid MOF has a heterostructure cladding composed of Ge-doped rod arrays and pure silica, and thus can support and propagate a vibrant cladding mode with a large mode area. When the outermost cladding of MOF is etched, the cladding mode becomes sensitive to the ambient refractive index (RI). The etched MOF can work as a sensing head for RI sensing. By comparing the interference spectra, the extinction ratio has remained stable at around 20 dB after the MOF was etched. The RI sensing characteristics of the MZI with an etched MOF have also been investigated. The results show that the RI sensitivity can reach up to 2183.6 nm/RIU with a low-temperature coefficient (<10 pm/°C).

scholarly journals New Trends in the Simulation of Nanosplasmonic Optical D-Type Fiber Sensors

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1772 ◽  
Author(s):  
Ariel Guerreiro ◽  
Diego Felipe Santos ◽  
José Manuel Baptista
Keyword(s):  
Optical Sensors ◽  
Mode Coupling ◽  
Future Perspectives ◽  
New Materials ◽  
Numerical Techniques ◽  
Physical Processes ◽  
Fiber Sensors ◽  
Sensor Performance ◽  
Fundamental Physical ◽  
Type Fiber

This article presents a review of the numerical techniques employed in simulating plasmonic optical sensors based on metal-dielectric nanostructures, including examples, ranging from conventional D-type fiber sensors, to those based on photonic crystal D-type fibers and incorporating metamaterials, nanowires, among other new materials and components, results and applications. We start from the fundamental physical processes, such as optical and plasmonic mode coupling, and discuss the implementation of the numerical model, optical response customization and their impact in sensor performance. Finally, we examine future perspectives.

Temperature-insensitive Refractive Index Sensing Based on W-type Fiber Grating

2017 ◽  
Author(s):  
Junjie Xie ◽  
Binbin Yan ◽  
Yanhua Luo ◽  
Haifeng Qi ◽  
Liwei Yang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Grating ◽  
Refractive Index Sensing ◽  
Type Fiber

Cladding mode reorganization in high-refractive-index-coated long-period gratings: effects on the refractive-index sensitivity

2005 ◽  
Vol 30 (19) ◽  
pp. 2536 ◽  
Author(s):  
Andrea Cusano ◽  
Agostino Iadicicco ◽  
Pierluigi Pilla ◽  
Luigi Contessa ◽  
Stefania Campopiano ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Refractive Index Sensitivity ◽  
Long Period ◽  
Long Period Gratings ◽  
Cladding Mode ◽  
Index Sensitivity
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