Research on signal processing in distributed optical fiber temperature measurement system

2013 ◽  
Author(s):  
Hongfang Ru ◽  
Jiacai Fu
Keyword(s):  
Signal Processing ◽  
Optical Fiber ◽  
Temperature Measurement ◽  
Measurement System ◽  
Temperature Measurement System ◽  
Distributed Optical Fiber

Distributed Optical Fiber Raman Temperature Measurement System Based on the Dynamic Multi-section Temperature Calibration

2011 ◽  
Vol 40 (9) ◽  
pp. 1297-1302
Author(s):  
金钟燮 JIN Zhong-xie ◽  
崔海军 CUI Hai-jun ◽  
宁枫 NING Feng ◽  
李小琴 LI Xiao-qin ◽  
朱永 ZHU Yong
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Measurement System ◽  
Temperature Calibration ◽  
Temperature Measurement System ◽  
Distributed Optical Fiber

A Linear Correcting Algorithm for Improving Space Resolution of Distributed Optical Fiber Raman Temperature Measurement System

2012 ◽  
Vol 41 (4) ◽  
pp. 408-413 ◽  
Author(s):  
宁枫 NING Feng ◽  
朱永 ZHU Yong ◽  
崔海军 CUI Hai-jun ◽  
李小琴 LI Xiao-qin ◽  
金钟燮 JIN Zhong-xie
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Measurement System ◽  
Space Resolution ◽  
Temperature Measurement System ◽  
Distributed Optical Fiber

Research for Thermal Drift of APD Gain in Distributed Temperature Sensing System Based on the Raman Back-Scattering

2012 ◽  
Vol 571 ◽  
pp. 716-720
Author(s):  
Lei Sang ◽  
Jie Zhang ◽  
Xin Qun Wang
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Bias Voltage ◽  
Laser Pulses ◽  
Distributed Temperature Sensing ◽  
Temperature Bias ◽  
Back Scattering ◽  
Temperature Measurement System ◽  
Distributed Optical Fiber ◽  
Anti Stokes

In the temperature measurement system of distributed optical fiber based on Raman back-scattering, the temperature measurement depends on a series of laser pulses in the optical fiber, which produces anti-stokes and stokes lights of Raman back-scattering at various points. By using the ratio of them, the measurement of temperature field space can be realized. But the signals that can be gained are quite weak in practice, and there are interferences of noises and external signals, therefore APD is selected (Avalance Photodiode) to amplify the weak signals. Because the gain characteristics of APD are vulnerable to the influences of temperature and bias voltage, so in this paper the experiments were carried on about the effects of temperature, bias voltage, incident power etc. on APD, and a substantive discussion was discussed.

Distributed Optical Fiber in High RCC Arch Dam Project

2013 ◽  
Vol 312 ◽  
pp. 639-643
Author(s):  
De Suo Cai ◽  
Hao Tang ◽  
Ye Shui Guo
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Measurement System ◽  
Cooling Water ◽  
Heat Of Hydration ◽  
Arch Dam ◽  
Technical Requirements ◽  
Rcc Arch Dam ◽  
Under Construction ◽  
Temperature Measurement System

As the highest RCC(Roller Compacted Concrete) arch dam under construction around the world, Wanjiakouzi adopted advanced distributed temperature system (DTS). This paper summarizes the network design, technical requirements as well as the protection precautions of fiber connector and monitoring port of temperature measurement system of optical fiber in high RCC arch dam in Wanjiakouzi. It can be indicated that the accuracy and reliability of DTS by comparing fiber optic temperature values with the conventional thermometer measured values. The analysis and monitoring results show that the temperature measurement system of optical fiber can truly monitor and reflect the change process of heat of hydration of RCC, gradation and the cooling water pipe to temperature.

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