scholarly journals FBG Arrays for Quasi-Distributed Sensing: A Review

2021 ◽  
Vol 11 (1) ◽  
pp. 91-108
Author(s):  
Chengli Li ◽  
Jianguan Tang ◽  
Cheng Cheng ◽  
Longbao Cai ◽  
Minghong Yang
Keyword(s):  
Laser System ◽  
Fast Response ◽  
Low Noise ◽  
Distributed Sensing ◽  
Vibration Monitoring ◽  
Wavelength Shift ◽  
Future Directions ◽  
Sensing System ◽  
Vibration Sensing ◽  
Temperature Strain

AbstractFiber Bragg grating (FBG) array is a powerful technique for quasi-distributed sensing along the entire length of sensing fiber with fast response and high precision. It has been widely used for temperature, strain, and vibration monitoring. In this review work, an overview on the recent advances of FBG arrays is conducted. Firstly, the fabrication methods of FBG array are reviewed, which include femtosecond laser system and online writing technique. Then, the demodulation techniques for FBG arrays are presented and discussed. Distributed static sensing can be performed by demodulating wavelength shift of each FBG, while phase demodulation techniques with low noise are employed for dynamic vibration sensing. Simultaneous distributed dynamic and static sensing system based on FBG array is also outlined. Finally, possible future directions are discussed and concluded. It is believed that the FBG array has great development potential and application prospect.

scholarly journals Developing IoT Sensing System for Construction-Induced Vibration Monitoring and Impact Assessment

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6120
Author(s):  
Qiuhan Meng ◽  
Songye Zhu
Keyword(s):  
Data Storage ◽  
Microelectromechanical Systems ◽  
Time Synchronization ◽  
Measurement Data ◽  
Vibration Monitoring ◽  
Raspberry Pi ◽  
Monitoring Systems ◽  
Promising Alternative ◽  
Sensing System ◽  
Vibration Sensing

Construction activities often generate intensive ground-borne vibrations that may adversely affect structure safety, human comfort, and equipment functionality. Vibration monitoring systems are commonly deployed to assess the vibration impact on the surrounding environment during the construction period. However, traditional vibration monitoring systems are associated with limitations such as expensive devices, difficult installation, complex operation, etc. Few of these monitoring systems have integrated functions such as in situ data processing and remote data transmission and access. By leveraging the recent advances in information technology, an Internet of Things (IoT) sensing system has been developed to provide a promising alternative to the traditional vibration monitoring system. A microcomputer (Raspberry Pi) and a microelectromechanical systems (MEMS) accelerometer are adopted to minimize the system cost and size. A USB internet dongle is used to provide 4G communication with cloud. Time synchronization and different operation modes have been designed to achieve energy efficiency. The whole system is powered by a rechargeable solar battery, which completely avoids cabling work on construction sites. Various alarm functions, MySQL database for measurement data storage, and webpage-based user interface are built on a public cloud platform. The architecture of the IoT vibration sensing system and its working mechanism are introduced in detail. The performance of the developed IoT vibration sensing system has been successfully validated by a series of tests in the laboratory and on a selected construction site.

Augmented Intelligent Distributed Sensing System Model for Precision Agriculture

2021 ◽  
Author(s):  
Sergio Silva ◽  
Diogo Duarte ◽  
Antonio Valente ◽  
Salviano Soares ◽  
Justino Soares ◽  
...  
Keyword(s):  
Precision Agriculture ◽  
Distributed Sensing ◽  
System Model ◽  
Sensing System

scholarly journals Plastic Optical Fiber Sensing of Alcohol Concentration in Liquors

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Masayuki Morisawa ◽  
Shinzo Muto
Keyword(s):  
Optical Fiber ◽  
Fast Response ◽  
Alcohol Concentration ◽  
Novolac Resin ◽  
Sensor Head ◽  
Cladding Layer ◽  
Fiber Sensing ◽  
Sensing System ◽  
Green Led ◽  
Optical Fiber Sensing

A simple optical fiber sensing system of alcohol concentration in liquors has been studied. In this sensor head, a mixture polymer of novolac resin and polyvinylidenefluoride (PVDF) with a ratio of 9 : 1 was coated as a sensitive cladding layer on the plastic fiber core made of polystyrene-(PS-)coated polycarbonate (PC). Using this sensor head and a green LED light source, it was confirmed that alcohol concentration in several kinds of liquors from beer to whisky can easily be measured with a fast response time less than 1 minute.

scholarly journals A Combined Events Recognition Scheme Using Hybrid Features in Distributed Optical Fiber Vibration Sensing System

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 105609-105616
Author(s):  
Kun Liu ◽  
Zhenshi Sun ◽  
Junfeng Jiang ◽  
Pengfei Ma ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Hybrid Features ◽  
Sensing System ◽  
Vibration Sensing ◽  
Distributed Optical Fiber
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