A transmit reflect detection system for fiber Bragg grating photonic sensors

2007 ◽  
Author(s):  
Graham Wild ◽  
Steven Hinckley ◽  
Paul Jansz
Keyword(s):  
Fiber Bragg Grating ◽  
Detection System ◽  
Bragg Grating ◽  
Photonic Sensors

Gas/liquid detection system based on intra-cavity absorption spectroscopy and tilted fiber Bragg grating

2019 ◽  
Vol 53 ◽  
pp. 102068
Author(s):  
Kun Liu ◽  
Yuanhao Zhao ◽  
Junfeng Jiang ◽  
Tianhua Xu ◽  
Pengxiang Chang ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Absorption Spectroscopy ◽  
Detection System ◽  
Bragg Grating ◽  
Liquid Detection

scholarly journals Wavelength Shift Measurement Method Without Use of Spectrometer: The New Way for Environment Photonic Sensors

2018 ◽  
Vol 28 (2) ◽  
pp. 139
Author(s):  
Pham Van Hoi ◽  
Nguyen Thuy Van ◽  
Pham Van Dai ◽  
Le Huu Thang ◽  
Nguyen Van An ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Low Cost ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Shift Measurement ◽  
Liquid Environment ◽  
Mixing Ratios ◽  
Narrow Line Width ◽  
Photonic Sensors ◽  
Testing Environments

The photonic sensors have shown very effectively for measuring the toxic contents in the liquid and air environments. In principle, the photonic sensors based on measurement of wavelength shift between reference condition and testing environments that we need use the spectrometer with high cost. In this paper, we present new configurations of photonic devices for measuring wavelength shift without use of spectrometer, which has a large potential for application in sensing technique with low cost. There are two configurations of photonic sensors are presented: i) first of them is based on fiber Bragg grating (FBG) combined with DFB laser diode with controlling wavelength emission by laser temperature and ii) second one is used  the fiber ring laser from Erbium-doped fiber and two FBG operated as  reference and sensing probe. The etched-fiber Bragg grating (e-FBG) as sensing probe is suitable for bio- and/ or chemical sensors. A novel photonic sensor can increase sensitivity and measuring accuracy of device by the narrow line-width of reflection spectra from laser and the sensor can determine a refractive index variation of 2x10-4, which is similarly for high resolution spectrometer. The experimental results show that this sensing method could determine different mixing ratios of organic solvents in liquid environment with good repeatability, high accuracy and rapid response.Keywords:

scholarly journals Acoustic Emission Source Localization System Using Fiber Bragg Grating Sensors and a Barycentric Coordinate-Based Algorithm

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Dandan Pang ◽  
Qingmei Sui ◽  
Ming Wang ◽  
Yaozhang Sai ◽  
Rongyao Sun ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fiber Bragg Grating ◽  
Detection System ◽  
Dynamic Strain ◽  
Bragg Grating ◽  
Al Alloy ◽  
Localization Algorithm ◽  
Alloy Plate ◽  
Morlet Wavelet Transform ◽  
Barycentric Coordinate

Structures and machines are very susceptible to some barely visible defects; acoustic emission (AE) is an effective technique of detecting defects and examining growth and location of these defects. In this paper, a new method was proposed to predict the position of the AE source. The dynamic strain signal from the AE source was acquired by fiber Bragg grating (FBG) sensors. Complex Morlet wavelet transform was used to extract narrowband signals from AE waves. It was proposed that the barycentric coordinate-based localization algorithm can be used to predict the coordinates of the AE source. The validation tests based on the designed AE detection system were performed on a 500 mm × 500 mm × 2 mm Al-alloy plate. The experimental results show that the proposed method is feasible.

scholarly journals An Investigation of Structural Damage Location Based on Ultrasonic Excitation-Fiber Bragg Grating Detection

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yuegang Tan ◽  
Li Cai ◽  
Bei Peng ◽  
Lijun Meng
Keyword(s):  
Structural Health Monitoring ◽  
Damage Detection ◽  
Fiber Bragg Grating ◽  
Health Monitoring ◽  
Structural Damage ◽  
Detection System ◽  
Bragg Grating ◽  
Alloy Plate ◽  
Structural Health ◽  
Sensing System

With the continuous development of mechanical automation, the structural health monitoring techniques are increasingly high requirements for damage detection. So structural health monitoring (SHM) has been playing a significant role in terms of damage prognostics. The main contribution pursued in this investigation is to establish a detection system based on ultrasonic excitation and fiber Bragg grating sensing, which combines the advantages of the ultrasonic detection and fiber Bragg grating (FBG). Differencing from most common approaches, a new way of damage detection is based on fiber Bragg grating (FBG), which can easily realize distributed detection. The basic characteristics of fiber Bragg grating sensing system are analyzed, and the positioning algorithm of structural damage is derived in theory. On these bases, the detection system was used to analyze damage localization in the aluminum alloy plate of a hole with diameters of 6 mm. Experiments have been carried out to demonstrate that the sensing system was feasible and that the estimation method of the location algorithm was easy to implement.

Temperature-controlled fiber Bragg grating dynamic strain detection system

2005 ◽  
Vol 119 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Xiao-Dong Wu ◽  
Cornelia Schmidt-Hattenberger ◽  
Kay Krüger ◽  
Jun Chen
Keyword(s):  
Fiber Bragg Grating ◽  
Detection System ◽  
Dynamic Strain ◽  
Bragg Grating ◽  
Temperature Controlled ◽  
Strain Detection

scholarly journals An Intrusion Detection System for the Protection of Railway Assets Using Fiber Bragg Grating Sensors

Sensors ◽  
2014 ◽  
Vol 14 (10) ◽  
pp. 18268-18285 ◽  
Author(s):  
Angelo Catalano ◽  
Francesco Bruno ◽  
Marco Pisco ◽  
Antonello Cutolo ◽  
Andrea Cusano
Keyword(s):  
Intrusion Detection ◽  
Fiber Bragg Grating ◽  
Intrusion Detection System ◽  
Detection System ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors

scholarly journals A Fiber Bragg Grating-Based Dynamic Tension Detection System for Overhead Transmission Line Galloping

Sensors ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 365 ◽  
Author(s):  
Guo-ming Ma ◽  
Ya-bo Li ◽  
Nai-qiang Mao ◽  
Cheng Shi ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Detection System ◽  
Bragg Grating ◽  
Dynamic Tension ◽  
Overhead Transmission Line
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