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Brillouin Optical Time Domain Analysis System Based On Differential Pulse And Second-order Raman Amplification

Posted on:2015-03-11Degree:MasterType:Thesis
Country:ChinaCandidate:C LiFull Text:PDF
GTID:2308330461974482Subject:Electronics and Communications Engineering
Abstract/Summary:PDF Full Text Request
Distributed optical fiber sensing technology gets more and more people’s attention because of its unique advantages,and it will be more practical high degree.Long distance distributed sensor for measuring the distance of its long and good spatial resolution and temperature resolution, has extensive application in many fields of engineering.To improve the performance of the system and reduce the error becomes the key to promoting the further development of the distributed optical fiber sensing technology.Around the long-distance distributed optical fiber sensor, this paper respectively from improving spatial resolution and extend the system measuring range two aspects were studied. First, we analyze the basic principle of differential pulse method, and study for the advantages and disadvantages of differential pulse method and the pulse selection for long-distance sensor. Second, experiment to achieve the coherent detection of Brillouin optical time-domain analysis(BOTDA) with 58ns/60ns differential pulse-width pair, the hot spot temperature is detected.20cm spatial resolution can be achieved within a 10km range. Finally, the second-order Raman amplification system was simulated and simulation, and experimental results of Sonia Martin-Lopez’s relative ratio, it can provide a more uniform along the sensing fiber loss compensation.Research results show that:First, the best pulse combination for the long-distance fiber-optic sensor is between 38ns/40ns and 58ns/60ns. To achieve a spatial resolution of 20cm, the differential pulse method can effectively improve the spatial resolution, but it will cause the measuring double time. Secondly, the second-order Raman amp-lification system can effectively compensate for the loss and uniform measurement in the measurement range of 100 km. Verify system performance using a temperature hot end of the fiber.20cm of spatial resolution and 4℃ of temperature resolution can be achieved.
Keywords/Search Tags:Distributed optical fiber sensor, SBS, DPP-BOTDA, Second-order Raman amplification
PDF Full Text Request
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