Distributed fiber-optic vibration detection system

2016 ◽  
Author(s):  
Yu Wang ◽  
Baoquan Jin ◽  
Yuncai Wang ◽  
Dong Wang ◽  
Xin Liu ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Vibration Detection

scholarly journals Development of fiber optic broadband vibration-detection system

Synthesiology ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 45-54 ◽  
Author(s):  
Hiroshi TSUDA ◽  
Eiichi SATO ◽  
Tomio NAKAJIMA ◽  
Akiyoshi SATO
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Vibration Detection

scholarly journals Development of fiber optic broadband vibration-detection system

2013 ◽  
Vol 6 (1) ◽  
pp. 50-59
Author(s):  
Hiroshi TSUDA ◽  
Eiichi SATO ◽  
Tomio NAKAJIMA ◽  
Akiyoshi SATO
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Vibration Detection

Experimental Study of Coupling Fiber-Optic Vibration Sensor Based on Variational Theory

2012 ◽  
Vol 490-495 ◽  
pp. 1181-1185 ◽  
Author(s):  
Bin Ma ◽  
Hou Lei Gao
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Control Unit ◽  
Piezoelectric Sensor ◽  
Vibration Sensor ◽  
Fiber Optic Sensor ◽  
Vibration Measurement ◽  
Variational Theory ◽  
Vibration Detection ◽  
Optic Sensor

According to the character of fiber-optic coupler, its coupling output is sensitive to the variation of coupling region’s length. A new kind of coupling fiber-optic vibration sensor is presented base on this principle. The theory of coupling single-mode fiber-optic sensor is analyzed. A prototype of fiber optic vibration detection system has been successfully built, including a sensor head, a low-cost control unit and a software package for signal processing with high resolution. The response of fiber-optic sensor and piezoelectric sensor to periodic vibration and shock is measured and the results of the coupling fiber-optic vibration sensor are closely in accordance with high precision piezoelectric sensor. The cross-axis anti-disturbance ability of the fiber-optic sensor is discussed in addition. Experimental results indicate that the coupling fiber-optic vibration sensor has favorable vibration detection capability; it can meet the requirement of vibration measurement.

Novel Fiber-Optic Sensing System for Detection of Methane

2013 ◽  
Vol 562-565 ◽  
pp. 1008-1015 ◽  
Author(s):  
Shu Tao Wang ◽  
Peng Wei Zhang ◽  
Quan Min Zhu
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Step Motor ◽  
Harmonic Detection ◽  
Distributed Feedback Laser ◽  
Gas Cell ◽  
Response Characteristics ◽  
The Stability ◽  
Application Fields ◽  
Methane Detection

Based on DFBLD (Distributed Feedback Laser Diode) and harmonic detection technique, a novel fiber-optic methane detection system is constructed. The system can be applied to broad-range concentration detection of methane. Based on the approximation express of the law of Beer-Lambert, detection of methane with various concentration from 0% to 20% is completed using subtraction of background and ratio processing method, as the atmosphere surroundings are treated as background noise. The direct absorption spectra for various concentration is measured using GRIN gas cell, combined with DFBLD. The R5 line of the 2v3 band of methane is selected as the absorption peak. The system is tested online during gas mixing process and the linear relationship between system indication and concentration variation is validated. Also the stability and dynamic response characteristics are confirmed by the experiments. The sensitivity of the system can be adjusted according to the concentration level of various field environments by changing the prism distance using step motor. In the range of 0% to 20% the sensitivity of methane detection can arrive at 0.001%. So the system can be applied to various application fields and adopted as monitoring instruments for coalmine tunnel and natural pipeline.

Fiber Optic Delivery And Detection System For HpD Photodynamic Therapy

1984 ◽  
Author(s):  
Daniel R. Doiron ◽  
Gregory S. Keller ◽  
A. E. Profio ◽  
Stanley W. Fountain
Keyword(s):  
Photodynamic Therapy ◽  
Fiber Optic ◽  
Detection System

COD detection system of full spectrum based on fiber-optic sensing

2015 ◽  
Vol 41 (3) ◽  
pp. 229-232
Author(s):  
沈建华 SHEN Jianhua ◽  
许键 XU Jian ◽  
黄杰 HUANG Jie ◽  
李本冲 LI Benchong ◽  
杨馥瑞 YANG Furui
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Full Spectrum ◽  
Fiber Optic Sensing

Experimental Analysis of Distributed Fiber Optic Underwater Natural Gas Pipeline Leakage Detection System

2014 ◽  
Vol 51 (11) ◽  
pp. 110602 ◽  
Author(s):  
黄悦 Huang Yue ◽  
王强 Wang Qiang ◽  
杨其华 Yang Qihua ◽  
章仁杰 Zhang Renjie
Keyword(s):  
Natural Gas ◽  
Experimental Analysis ◽  
Fiber Optic ◽  
Detection System ◽  
Gas Pipeline ◽  
Leakage Detection ◽  
Natural Gas Pipeline
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