分布式光纖傳感器的長距離密集波分復(fù)用技術(shù)和應(yīng)用研究
[Abstract]:Distributed optical fiber sensing technology has the characteristics of integrating sensing and transmission, and it is a hot research topic in the field of optical fiber sensing. Distributed optical fiber sensor has been widely used in various fields of national economy and security construction because of its superior sensing performance. The progress of modern science and technology and the development of engineering application have put forward higher requirements for distributed optical fiber sensing technology. Single optical fiber sensing has become more and more unable to meet the needs of practical application integration, networking and long distance. In this paper, a multi-distributed optical fiber sensing system based on dense wavelength Division Multiplexing (DWDM) technology is proposed. The sensing capacity of a single optical fiber is extended by using DWDM technology, and multiple parameters are sensed simultaneously on one optical fiber. The practicability of optical fiber sensing technology is improved. In this paper, the background, principle and key technology of DWDM technology are introduced, and the nonlinear problems faced by DWDM multi-distributed optical fiber sensor system in single optical fiber are analyzed. Then the nonlinear problem in DWDM multi-distributed optical fiber sensing system is studied by means of simulation and experimental verification, and a suitable sensing scheme is given. Finally, in order to meet the application requirements of long-distance sensing, the hybrid amplification method of erbium-doped fiber amplifier and distributed Raman amplifier is used to prolong the single-stage sensing distance. A relay amplifier for long distance distributed optical fiber sensing is proposed. According to the characteristic that the distributed optical fiber sensor is different from the optical communication, the excited light and the sensing light transmitted in the optical fiber are properly relayed and amplified respectively, so as to obtain better sensing quality while prolonging the sensing distance.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TP212
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