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以大倾角煤层开采为研究背景，运用工程规律总结、理论分析、力学建模及物理相似模拟试验等研究方法，将BOTDA(基于布里渊散射的分布式光纤传感)与DIC(三维光学数字散斑)技术相结合，分析大倾角煤层开采顶板破坏规律及应力演化特征。研究表明：大倾角煤层原岩应力分布中部最大、下部次之、上部最小，中上部顶板弯矩及剪力大于下部，矸石堆积密度由下往上逐渐降低，中上部顶板活动剧烈，下部较稳定；光纤可感知岩体内部微...
为研究混合结构PBL剪力键群各剪力键的剪力传递,在开孔板界面摩擦效应测试中引入了光纤传感测试技术。阐述了PPP-BOTDA (Pulse-PrePump Brillouin Optical Time Domain Analysis)技术的测量原理,根据多中间层的剪滞理论,建立了基体-光纤间的应变传递模型,推导了表贴式光纤的应变传递公式,基于4个四排PBL剪力键群试件的静载破坏试验,实现了对PBL剪...
Long-Range Distributed Strain and Temperature Sensing with 40-cm Spatial Resolution Based on DPP-BOTDA Employing Optical Pre-Amplification and Simplex Coding
Fiber optics sensors Stimulated scattering
2015/5/25
Sub-meter resolution sensing has been achieved employing linear pre-amplification with Simplex-coded pulses employing DPP-BOTDA. Results demonstrate a spatial resolution of ~40 cm over 56km sensing fi...
Enhanced long-range distributed strain and temperature sensing using BOTDA and optical pulse coding
Enhanced long-range distributed strain temperature sensing BOTDA optical pulse coding
2015/7/20
Optical pulse coding is successfully applied to long-range sensors based on Brillouin optical time domain analysis, achieving a record of 1 meter spatial resolution over 50 km of SMF with 2.2°C / 44 μ...