本文選題：邊坡形變 + 分布式光纖傳感網(wǎng)　； 參考：《昆明理工大學》2015年碩士論文

【摘要】：光纖彎曲半徑大于纖芯半徑時會引起光纖的宏彎損耗,利用光纖宏彎損耗的機制將光纖植入到被測構件中,通過基于瑞利散射的分布式光纖監(jiān)測系統(tǒng)監(jiān)測光纖鏈路損耗點位置和損耗信息判別構件斷裂點和變形位置。本文以工程應用為基礎,利用基于宏彎損耗的分布式光纖傳感器監(jiān)測技術對邊坡表面變形進行實時監(jiān)測。搭建了4通道的分布式監(jiān)測系統(tǒng)和實時在線的邊坡表面形變監(jiān)測系統(tǒng),實現(xiàn)了對邊坡表面變形和裂縫的有效監(jiān)測。主要研究內(nèi)容如下：(1)根據(jù)宏彎損耗的分布式光纖傳感器檢測原理,通過對瑞利后向散射光功率監(jiān)測檢測宏彎損耗位置和損耗信息。實現(xiàn)四通道光時域反射儀硬件設計,包括OTDR模塊選型、光開關模塊選型、電源電路、光開關控制電路,并開發(fā)了四通道光時域反射儀上位機軟件。通過對系統(tǒng)進行測試,測試結果表明,在脈沖寬度為5ns其事件盲區(qū)≤3m。(2)利用光纖宏彎損耗原理將分布式光纖傳感網(wǎng)通過表面粘貼方式與菱形布設方法,將993m緊套光纖布設在上下邊坡,實現(xiàn)邊坡表面變形與裂縫位置信息的監(jiān)測。開發(fā)了分布式光纖傳感網(wǎng)邊坡表面形變監(jiān)測系統(tǒng),對山地變電站邊坡變形進行在線監(jiān)測。3個月的監(jiān)測結果表明,在2014年8月份發(fā)現(xiàn)在邊坡928.37m出現(xiàn)非反射事件,損耗值為2.5dB,說明該處存在變形。
[Abstract]:When the bending radius of fiber is larger than the radius of fiber core, it will lead to the loss of optical fiber, so the optical fiber can be implanted into the tested component by the mechanism of fiber macro bending loss. A distributed optical fiber monitoring system based on Rayleigh scattering is used to monitor the location of the loss point and the loss information of the optical fiber link to distinguish the breaking point and the deformation position of the component. In this paper, based on engineering application, real-time monitoring of slope surface deformation is carried out by using distributed optical fiber sensor monitoring technology based on macro bending loss. A 4-channel distributed monitoring system and a real-time on-line monitoring system for slope surface deformation are set up, which can effectively monitor the surface deformation and crack of the slope. The main research contents are as follows: (1) according to the principle of distributed optical fiber sensor, the position and loss information of macro bending loss are detected by Rayleigh backscattering light power monitoring. The hardware design of four-channel optical time domain reflectometer is realized, including OTDR module selection, optical switch module selection, power supply circuit, optical switch control circuit, and the host computer software of four-channel optical time domain reflectometer is developed. By testing the system, the test results show that the distributed optical fiber sensor network is distributed through the surface paste and rhombus layout method using the principle of optical fiber macro bending loss when the pulse width is 5ns and the event blind area is 鈮，

本文編號：2028397