Evaluation of closed cracks in thin plates based on the nonlinear ultrasonic waves received by a high-sensitivity optical fiber sensor

2016 ◽  
Vol 2016 (0) ◽  
pp. J0440404
Author(s):  
Wensheng KONG ◽  
Qi WU ◽  
Fengming YU ◽  
Yoji OKABE
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Ultrasonic Waves ◽  
Thin Plates ◽  
Fiber Sensor ◽  
Nonlinear Ultrasonic

A High Sensitivity Optical Fiber Sensor for GIS Partial Discharge Detection

2019 ◽  
Vol 19 (20) ◽  
pp. 9235-9243 ◽  
Author(s):  
Guo-Ming Ma ◽  
Hong-yang Zhou ◽  
Meng Zhang ◽  
Cheng-Rong Li ◽  
Yu Yin ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Partial Discharge ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Fiber Sensor ◽  
Discharge Detection

scholarly journals High sensitivity sol-gel silica coated optical fiber sensor for detection of ammonia in water

2016 ◽  
Vol 24 (21) ◽  
pp. 24179 ◽  
Author(s):  
Dejun Liu ◽  
Wei Han ◽  
Arun Kumar Mallik ◽  
Jinhui Yuan ◽  
Chongxiu Yu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Sol Gel ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Fiber Sensor

Plastic optical fiber sensor for temperature-independent high-sensitivity detection of humidity

2020 ◽  
Vol 59 (19) ◽  
pp. 5708
Author(s):  
Nainbing Zhong ◽  
Xin Xin ◽  
Huimin Liu ◽  
Xiaoyi Yu ◽  
Haixing Chang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Fiber Sensor ◽  
Plastic Optical Fiber ◽  
High Sensitivity Detection ◽  
Sensitivity Detection

A Long Cylindrical Optical Fiber Sensor Based on Multiple Total Internal Reflections in Heterodyne Interferometry

2014 ◽  
Vol 530-531 ◽  
pp. 3-6
Author(s):  
Shinn Fwu Wang ◽  
Ming Jen Wang ◽  
Jyh Shyan Chiu
Keyword(s):  
Refractive Index ◽  
Phase Shift ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Fiber Sensor ◽  
Heterodyne Interferometry ◽  
Fiber Sensors ◽  
Biochemical Sensing ◽  
Real Time Measurement

In this paper, a long cylindrical multimode optical fiber sensor (OFS) based on multiple total internal reflections in heterodyne interferometry is proposed. The cladding of the sensing portions of the fiber sensors is removed, but dont be coated with any metal films. With the OFS the phase shift difference due to the multiple total internal reflections (MTIRs) effect between the p-and s-polarizations can be measured by using the heterodyne interferometry. Substituting the phase shift difference into Fresnels equations, the refractive index for the tested medium can be calculated. According to numerical simulations and experimental results, the long cylindrical OFS is with the best resolution of 0.0000028 refractive index unit (RIU). However, the OFS could be valuable for chemical, biological and biochemical sensing. It has some merits, such as, high sensitivity, high resolution, stability, small size and in real-time measurement.

scholarly journals Optical Fiber Sensor for Heavy Chemical Detection: An Overview

2021 ◽  
Vol 2075 (1) ◽  
pp. 012010
Author(s):  
Nurul Athirah Mohamad Abdul Ghafar ◽  
Arni Munira Markom ◽  
Marni Azira Markom ◽  
Ahmad Razif Muhammad
Keyword(s):  
Optical Fiber ◽  
Electromagnetic Interference ◽  
Low Cost ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Electrochemical Analysis ◽  
Detection Methods ◽  
Fiber Sensor ◽  
Sensor Technology ◽  
Compact Size

Abstract Heavy metal contaminations such as mercury, lead, arsenic, cadmium, and zinc are becoming more serious and have become a hazard to human health. Due to their non-biodegradable nature, they can easily accumulate in the environment and cause toxicity even at low concentrations. Therefore, detecting the presence of these metal ions requires a highly sensitive sensing method. Traditional detection methods, such as electrochemical analysis, require complicated sample preparation, are costly, and typically require a lengthy measurement period. These days, optical fiber sensors have been acknowledged due to their unique characteristics such as compact size, high sensitivity, low cost, high flexibility, and immunity to electromagnetic interference. An overview of an optical fiber sensor technology for heavy chemical measurement is discussed in this paper. The sensing mechanisms are summarized, as well as the chemical water quality parameters and sensitivities.

DESIGN AND FABRICATION OF A NOVEL NONCONTACT VIBRATION SENSOR USING INCLINED-CUT OPTICAL FIBER

2008 ◽  
Vol 22 (11) ◽  
pp. 1177-1182
Author(s):  
KYONG-WOO KIM ◽  
WOO-SEONG CHE ◽  
HYU-SANG KWON
Keyword(s):  
Optical Fiber ◽  
Low Cost ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Intensity Modulation ◽  
Vibration Sensor ◽  
Fiber Sensor ◽  
Electric Signal ◽  
Modulation Type ◽  
Low Sensitivity

This optical fiber sensors are being widely used alternative to conventional sensors in various applications because of small size, relatively light weight, high sensitivity and wide bandwidth. Also it has immunity to electromagnetic interferences, because of their dielectric, glass, or plastic nature, they are usually small and light, and they allow remote electric signal opto-electronic conversion and processing. In various uses of optical fiber, intensity modulation type sensor due to misalignment has practical usefulness because it can be realized in ease with low cost and simple structure. To overcome low sensitivity problem in intensity modulation type optical fiber sensor, inclined-cut optical fiber is considered here. Based on optical geometry, the inclined-cut optical fiber sensor is designed and fabricated. The experiments are carried out to evaluate sensor performance. The optical fiber sensor developed in this paper has sufficient precisions and therefore it is available to measure the vibration without contact.

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