scholarly journals MEMS-Based Reflective Intensity-Modulated Fiber-Optic Sensor for Pressure Measurements

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2233 ◽  
Author(s):  
Ning Zhou ◽  
Pinggang Jia ◽  
Jia Liu ◽  
Qianyu Ren ◽  
Guowen An ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Room Temperature ◽  
Microelectromechanical Systems ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Pressure Measurements ◽  
Integrated Sensor ◽  
Intensity Modulated ◽  
Optic Sensor

A reflective intensity-modulated fiber-optic sensor based on microelectromechanical systems (MEMS) for pressure measurements is proposed and experimentally demonstrated. The sensor consists of two multimode optical fibers with a spherical end, a quartz tube with dual holes, a silicon sensitive diaphragm, and a high borosilicate glass substrate (HBGS). The integrated sensor has a high sensitivity due to the MEMS technique and the spherical end of the fiber. The results show that the sensor achieves a pressure sensitivity of approximately 0.139 mV/kPa. The temperature coefficient of the proposed sensor is about 0.87 mV/°C over the range of 20 °C to 150 °C. Furthermore, due to the intensity mechanism, the sensor has a relatively simple demodulation system and can respond to high-frequency pressure in real time. The dynamic response of the sensor was verified in a 1 kHz sinusoidal pressure environment at room temperature.

Development of a Room-Temperature Phosphorescence Fiber-Optic Sensor

1996 ◽  
Vol 68 (9) ◽  
pp. 1599-1604 ◽  
Author(s):  
A. D. Campiglia ◽  
J. P. Alarie ◽  
T. Vo-Dinh
Keyword(s):  
Room Temperature ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Room Temperature Phosphorescence ◽  
Optic Sensor

Highly sensitive fiber optic sensor for dynamic pressure measurements

1999 ◽  
Author(s):  
Magdalena S. Nawrocka ◽  
Wojtek J. Bock ◽  
Waclaw Urbanczyk ◽  
Jan Wojcik
Keyword(s):  
Fiber Optic ◽  
Dynamic Pressure ◽  
Fiber Optic Sensor ◽  
Pressure Measurements ◽  
Optic Sensor ◽  
Highly Sensitive ◽  
Dynamic Pressure Measurements

High Sensitivity Humidity Fiber-Optic Sensor Based on All-Agar Fabry–Perot Interferometer

2018 ◽  
Vol 18 (12) ◽  
pp. 4879-4885 ◽  
Author(s):  
Bo Wang ◽  
Jiajun Tian ◽  
Ling Hu ◽  
Yong Yao
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Fabry Perot

scholarly journals Multifunctional Extrinsic Fiber Optic Sensor to Measure Various Parameters of Liquids at the Operating Wavelength of 660nm Employing a U-Shaped Glass Rod as a Sensing Element

2019 ◽  
Vol 8 (2S3) ◽  
pp. 1418-1431
Keyword(s):  
Optical Fibers ◽  
Fiber Optic ◽  
Adiabatic Compressibility ◽  
Molar Refraction ◽  
Fiber Optic Sensor ◽  
Sensor Technology ◽  
Sensing Element ◽  
Optic Sensor ◽  
Operating Wavelength ◽  
Shaped Glass

Fiber Optic sensor technology has become more popular since early 1970’s during which the mechanism of losses from optical fibers was exploited to construct a new class of fiber optic sensors and systems. A novel fiber optic sensor has been developed by connecting a U-shaped glass element of specific dimensions between a light source of 660nm wavelength and an optical power detector by using a couple of PCS optical fibers of 200/230μm diameters of core and cladding respectively. The sensor can be employed to measure several parameters such as Refractive Index, Density, Viscosity, Ultrasonic Velocity, Molar Volume, Molar Refraction, Dielectric Constant, Acoustic Impendence, Adiabatic Compressibility, Viscous Relaxation Time, Intermolecular Free Length, Absorption Coefficient, Gibb’s Free Energy, Free Volume, Internal Pressure and their excess parameters of Toluene and tert-Butanol mixtures at 30℃ temperature and at the operating wavelength of 660nm

Low-cost real-time fiber optic sensor for intrusion detection

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Adel Abdallah ◽  
Mohamed M. Fouad ◽  
Hesham N. Ahmed
Keyword(s):  
Signal Processing ◽  
Intrusion Detection ◽  
Real Time ◽  
Fiber Optic ◽  
Reference Signal ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Content Type ◽  
Intensity Modulated ◽  
Optic Sensor

Purpose The purpose of this paper is to introduce a novel intensity-modulated fiber optic sensor for real-time intrusion detection using a fiber-optic microbend sensor and an optical time-domain reflectometer (OTDR). Design/methodology/approach The proposed system is tested using different scenarios using person/car as intruders. Experiments are conducted in the lab and in the field. In the beginning, the OTDR trace is obtained and recorded as a reference signal without intrusion events. The second step is to capture the OTDR trace with intrusion events in one or multiple sectors. This measured signal is then compared to the reference signal and processed by matrix laboratory to determine the intruded sector. Information of the intrusion is displayed on an interactive screen implemented by Visual basic. The deformer is designed and implemented using SOLIDWORKS three-dimensional computer aided design Software. Findings The system is tested for intrusions by performing two experiments. The first experiment is performed for both persons (>50 kg) in the lab and cars in an open field with a car moving at 60 km/h using two optical fiber sectors of lengths 200 and 500 m. For test purposes, the deformer length used in the experiment is 2 m. The used signal processing technique in the first experiment has some limitations and its accuracy is 70% after measuring and recording 100 observations. To overcome these limitations, a second experiment with another technique of signal processing is performed. Research limitations/implications The system can perfectly display consecutive intrusions of the sectors, but in case of simultaneous intrusions of different sectors, which is difficult to take place in real situations, there will be the ambiguity of the number of intruders and the intruded sector. This will be addressed in future work. Suitable and stable laser power is required to get a suitable level of backscattered power. Optimization of the deformer is required to enhance the sensitivity and reliability of the sensor. Practical implications The proposed work enables us to benefit from the ease of implementation and the reduced cost of the intensity-modulated fiber optic sensors because it overcomes the constraints that prevent using the intensity-modulated fiber optic sensors for intrusion detection. Originality/value The proposed system is the first time long-range intensity-modulated fiber optic sensor for intrusion detection.

Advanced Plasmonic Fiber-Optic Sensor for High Sensitivity Measurement of Magnetic Field

2019 ◽  
Vol 19 (17) ◽  
pp. 7355-7364 ◽  
Author(s):  
Eva Rodriguez-Schwendtner ◽  
Maria-Cruz Navarrete ◽  
Natalia Diaz-Herrera ◽  
Agustin Gonzalez-Cano ◽  
Oscar Esteban
Keyword(s):  
Magnetic Field ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Sensitivity Measurement ◽  
Optic Sensor
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