scholarly journals Enhancing Temperature Sensitivity of the Fabry–Perot Interferometer Sensor with Optimization of the Coating Thickness of Polystyrene

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 794 ◽  
Author(s):  
Tejaswi Tanaji Salunkhe ◽  
Dong Jun Lee ◽  
Ho Kyung Lee ◽  
Hyung Wook Choi ◽  
Sang Joon Park ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Temperature Sensitivity ◽  
Coating Thickness ◽  
Temperature Sensor ◽  
Coefficient Of Thermal Expansion ◽  
High Sensitivity ◽  
Single Mode ◽  
Solution Concentration ◽  
Air Bubble ◽  
Edge Surface

The exploration of novel polymers for temperature sensing with high sensitivity has attracted tremendous research interest. Hence, we report a polystyrene-coated optical fiber temperature sensor with high sensitivity. To enhance the temperature sensitivity, flat, thin, smooth, and air bubble-free polystyrene was coated on the edge surface of a single-mode optical fiber, where the coating thickness was varied based on the solution concentration. Three thicknesses of the polystyrene layer were obtained as 2.0, 4.1, and 8.0 μm. The temperature sensor with 2.0 μm thick polystyrene exhibited the highest temperature sensitivity of 439.89 pm °C−1 in the temperature range of 25–100 °C. This could be attributed to the very uniform and thin coating of polystyrene, along with the reasonable coefficient of thermal expansion and thermo-optic coefficient of polystyrene. Overall, the experimental results proved the effectiveness of the proposed polystyrene-coated temperature sensor for accurate temperature measurement.

scholarly journals INVESTIGATING THE EFFECT OF TAPER LENGTH ON SENSITIVITY OF THE TAPERED-FIBER BASED TEMPERATURE SENSOR

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Baktiar Musa ◽  
Yasmin Mustapha Kamil ◽  
Muhammad Hafiz Abu Bakar ◽  
Ahmad Shukri Mohd Noor ◽  
Alyani Ismail ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Optimum Parameter ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Careful Selection ◽  
Tapered Fiber ◽  
Tapered Optical Fiber ◽  
Good Repeatability ◽  
Selection Of

A temperature sensor using single-mode tapered fiber is presented. To better understand the behaviour of a tapered optical fiber, transmission experiments with different taper profiles, specifically waist length were performed. The effects of taper profiles on the sensitivity of the sensor were also investigated. It is demonstrated that careful selection of the taper profile can increase the sensitivity of the sensor. In our experiment, a good temperature sensing result was achieved using the optimum parameter. The best sensitivity achieved was 45.5 pm/°C that measured the range of temperature from 30°C to 120°C. The fabricated sensors are easy to fabricate and relatively low cost. Our results indicate that the tapered fiber based temperature sensor has high sensitivity and good repeatability.  

Temperature sensor based on a single-mode tapered optical fiber

2011 ◽  
Vol 15 (2) ◽  
pp. 101-104 ◽  
Author(s):  
Shan Zhu ◽  
Jie-wen Xing ◽  
Fu-fei Pang ◽  
Ting-yun Wang
Keyword(s):  
Optical Fiber ◽  
Temperature Sensor ◽  
Single Mode ◽  
Tapered Optical Fiber

scholarly journals ZnO Composite Graphene Coating Micro-Fiber Interferometer for Ultraviolet Detection

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1478 ◽  
Author(s):  
Tao Shen ◽  
Xiaoshuang Dai ◽  
Daqing Zhang ◽  
Wenkang Wang ◽  
Yue Feng
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Single Mode ◽  
Ultraviolet Detection ◽  
Sensing Technology ◽  
Detection Technology ◽  
Zno Nanosheets ◽  
Optical Fiber Sensing ◽  
Higher Sensitivity

A simple and reliable ultraviolet sensing method with high sensitivity is proposed. ZnO and ZnO composite graphene are successfully prepared by the hydrothermal method. The optical fiber sensor is fabricated by coating the single-mode-taper multimode-single-mode (STMS) with different shapes of ZnO. The effects of the sensitivity of ultraviolet sensors are further investigated. The results show that the sensor with ZnO nanosheets exhibits a higher sensitivity of 357.85 pm/nW·cm−2 for ultraviolet sensing ranging from 0 to 4 nW/cm2. The ultraviolet characteristic of STMS coated flake ZnO composite graphene has been demonstrated with a sensitivity of 427.76 pm/nW·cm−2. The combination of sensitive materials and optical fiber sensing technology provides a novel and convenient platform for ultraviolet detection technology.

scholarly journals A microfluidic system for analysis of electrochemical processing using a highly sensitive optical fiber microcavity

2021 ◽  
Author(s):  
Andrzej Krześniak ◽  
Tomasz Gabler ◽  
Monika Janik ◽  
Marcin Koba ◽  
Martin Jönsson-Niedziółka ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Flow Direction ◽  
High Sensitivity ◽  
Side Surface ◽  
Single Mode ◽  
Microfluidic System ◽  
Optical Measurements ◽  
Injection System ◽  
Highly Sensitive ◽  
Static Conditions

Microfluidics provide unique possibilities to control tiny volumes of liquids and their composition. To effectively benefit from the advantages of microfluidic solutions they need to be supported by interrogation subsystems, at best also matching the miniature scale. In this work we combined with a microfluidic system a Microcavity in-line Mach-Zehnder Interferometer (µIMZI) induced in the side surface of a single-mode optical fiber using a femtosecond laser micromachining. The µIMZI shows capability for investigating optical properties of as small as picoliter volumes with an exceptionally high sensitivity. Here we report numerical analysis and experimental results that show that when the µIMZI is incorporated with the microfluidic system the measurements can be performed with sensitivity exceeding 14,000 nm/RIU which is similar to measurements done under static conditions. In a flow injection system we show that a certain amount of liquid and flow rate are required to effectively exchange the liquid in the microcavity, while orientation of the cavity versus the flow direction has a minor impact on the exchange. Finally, we have supported the system by band electrodes making it possible to induce redox reactions in the microchannel and optical detection of flowing products of the reactions. It has been found that thanks to the high sensitivity of the µIMZI the products of the reactions can be clearly detected both electrochemically and optically even when the only part of the flowing redox probe is oxidized at the band electrode. This work proves that the proposed solution may offer highly sensitive optical measurements, even when the chemical reactions are not effective in the whole volume of the system.

High-sensitivity optical fiber temperature sensor with cascaded configuration of MZI and FPI based on Vernier effect

2021 ◽  
Vol 67 ◽  
pp. 102751
Author(s):  
Hang Su ◽  
Chunlong Zhao ◽  
Xiaokang Song ◽  
Fanxin Kong ◽  
Zhaorong Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Temperature Sensor ◽  
High Sensitivity ◽  
Vernier Effect
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