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辽东湾某平台位于辽东湾海域,该海域每年冬季都会形成大量的海冰,海冰给平台的作业生产及船舶运输带来严重安全威胁.由于辽东湾某平台结构特殊,海冰不仅使平台发生较强的冰激振动,同时海冰也在平台底部形成堆积,给平台冬季的安全运行带来一定的安全隐患.基于多年冬季现场监测,针对平台底部冰堆成因及冰阻塞对平台安全影响进行分析,并给出应对措施及建议. 相似文献
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Vacuum Ultraviolet Excited Photoluminescence Properties of Novel Na3Y9O3(BO3)8:Tb^3+ Phosphor 总被引:1,自引:0,他引:1 下载免费PDF全文
The novel vacuum ultraviolet (VUV) excited Na3 Y9O3 (BO3)8:Tb^3+ (NYOB:Tb^3+) green phosphor is prepared. Strong VUV photoluminescence and high quenching concentration of Tb^3+ (20 wt%) are observed in NYOB: Tb^3+ and the strong emission are correlated with the unique layer-type structure of NYOB. All the characteristic 4 f - 5d transitions of Tb^3+ and the host absorption band in VUV region are identified in the excitation spectrum. Based on the results, the energy levels scheme of Tb^3+ in NYOB:Tb^3+ is first established. This newly developed NYOB:Tb^3+ phosphor shows excellent optical properties when compared with the commercial Zn2SiO4:Mn^2+ and would be a potential VUV-excited green phosphor. 相似文献
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基于多模光纤滤波器的可调谐掺铒光纤激光器 总被引:1,自引:0,他引:1
研究了一种新型、全光纤、宽带可调谐环形腔掺铒光纤激光器。该激光器利用由单模-多模-单模光纤组成的滤波器实现波长可调谐及激光器的全光纤结构。该滤波器将多模光纤缠绕在偏振控制器上,两端分别与一段单模光纤相连,通过调整偏振控制器的状态,实现了中心波长1542~1560nm的不同激光输出。单波长连续可调谐激光器的波长可调范围为18nm,边模抑制比大于40dB,3dB线宽为0.096nm;进一步调整偏振控制器的状态和抽运功率,实验同时得到了连续可调谐的双波长、三波长等多波长激光输出。对于可调谐的多波长激光器,通过调整偏振控制器的状态,可实现波长间隔及输出中心波长两者可调。 相似文献
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