Enhanced 1.32 µm fluorescence and broadband amplifying for O-band optical amplifier in Nd3+-doped tellurite glass

WO3 oxides with relatively high phonon energy and different concentrations were introduced into the Nd3+-doped tellurite-based glasses of TeO2-ZnO-Na2O to improve the 1.32 µm band fluorescence emission. The absorption spectra, Raman spectra, 1.32 µm band fluorescence spectra and differential scanning calorimeter (DSC) curves were measured, together with the Judd-Ofelt intensity parameters, stimulated emission and gain parameters were calculated to evaluate the effects of WO3 amount on the glass structure and spectroscopic properties of 1.32 µm band fluorescence. It is shown that the introduction of an appropriate amount of WO3 oxide can effectively improve the 1.32 µm band fluorescence intensity through the enhanced multi-phonon relaxation (MPR) processes between the excited levels of Nd3+. The results indicate that the prepared Nd3+-doped tellurite glass with an appropriate amount of WO3 oxide is a potential gain medium applied for the O-band broad and high-gain fiber amplifier.     

基于REAL气溶胶激光雷达在站比对标定技术研究

年3月—11月,利用经过欧洲激光雷达标校中心认证的移动REAL 标准气溶胶激 光雷达,开展了迄今为止国内最大规模的激光雷达在站比对标定。本文首先介绍了一种组网 激光雷达在站比对标定方法,然后将REAL雷达与北京、上海、广州3个城市相关站点的12 部气溶胶激光雷达在532 nm波长下开展了首次在站比对标定。根据预 先设定的指标对其中按照 气象探测中心(meteorological observation center,MOC)要求完成软硬件标定的11部雷达进行了定量评估。结果表明11部雷达基本满 足指标要求,其中9部雷达P/S通道2—5 km系统偏差(system deviation,SD)均在±20%以内,超过50%的被标雷达P 通道0.5—2 km系统偏差基本满足±10%以内。 通过在站比对标定技术可以有效识别P/S通道 串扰、探测器饱和等问题,确 定了超大城市试验中被标雷达可信数据的范围,为气溶胶激光 雷达业务化定量应用提供了技术支撑。     

改革开放与中国石化总公司的安全工作

以社会主义市场经济理论为基础,针对中国石化总公司将改造成控股公司的客观实际,用解放思想、实事求是的思维方法论述了石化企业在改革中安全工作的重要性。对中国石化总公司安全工作历史作了客观的回顾分析,并且对其所属企业当前的安全工作状况进行了归纳。进一步探索了中国石化总公司在经济体制改革过程中,如何搞好安全工作:对安全的静态管理与动态管理,宏观管理和微观管理等问题作了辩析;并对中国石化总公司企业内部保险与安技产业如何适应改革需要而应采取的具体做法发表了看法。     

Enhancement of 2.0 µm fluorescence emission in new Ho3+/Tm3+/Yb3+ tri-doped tellurite glasses

For enhancing the 2.0 µm band fluorescence of Ho3+, a certain amount of WO3 oxide was introduced into Ho3+/Tm3+/Yb3+ tri-doped tellurite glass prepared using melt-quenching technique. The prepared tri-doped tellurite glass was characterized by the absorption spectra, fluorescence emission and Raman scattering spectra, together with the stimulated absorption, emission cross-sections and gain coefficient. The research results show that the introduction of WO3 oxide can further improve the 2.0 µm band fluorescence emission through the enhanced phonon-assisted energy transfers between Ho3+/Tm3+/Yb3+ ions under the excitation of 980 nm laser diode (LD). Meanwhile, the maximum gain coefficient of Ho3+ at 2.0 µm band reaches about 2.36 cm-1. An intense 2.0 µm fluorescence emission can be realized .     

工业油罐底泥处理现状与试验探索

根据油罐底泥产生过程及其特性,分析了原油储罐底泥处理的必要性和经济性,介绍了国内外油罐清理的方法和油罐底泥处理的工艺技术,公布了课题组在开发油罐底泥处理国产化设备方面的试验成果,试验处理效果良好,碳氢化合物回收率达到95％以上,处理后废水符合排放污水处理装置的要求,残余污泥量为原来的12.2％(质量比),为油罐底泥减量化、资源化和处理设备的国产化提供可借鉴范例。     

SL3-1型双翻斗雨量计测量协调性研究

为研究双翻斗雨量计测量协调性,通过模拟降水建立统计模型,分析上下翻斗排水量的构成因子,上翻斗流失量与倾角及雨强的关系,论证下翻斗流失量的必然性及消失现象,讨论下翻斗流失量被上翻斗的影响程度,以及下翻斗翻转阈值和流失量的合理取值范围。根据上翻斗不同翻转阈值对测量结果的影响对雨量计的测量协调状态进行分类,指出大小雨强两极分化原因和解决方法,得出雨量计最佳协调状态时的数据模型为： 上翻斗翻转阈值接近 0.100 mm,下翻斗翻转阈值接近 0.080 mm,上下翻斗在小雨强下完全同步而大雨强下翻转比例低于 9∶10。实践表明：据此模型将上下翻斗翻转阈值和不同雨强下翻转比例关系纳入双翻斗雨量计检修流程中可明显提高检定效率,也为双翻斗雨量计的分析研究提供新的方法和思路。     

Pr3+/Nd3+ codoped tellurite glass for O+E+S-band broad emission

In this work, Pr3+ was introduced into Nd3+-doped tellurite glass with composition TeO2-ZnO-Na2O-Nb2O5 to achieve broadband near-infrared emission. A broadband fluorescence emission ranging from 1 250 nm to 1 530 nm was obtained under the excitation of 808 nm LD, which is contributed by the Pr3+:1D2 →1G4 and Nd3+:4F3/2→4I13/2 transitions emitting the fluorescence located at around 1.47 µm and 1.35 µm bands, respectively. The 1.47 µm band fluorescence of Pr3+ is attributed to the energy transfer from Nd3+ to Pr3+ ions and the energy transfer mechanism was further investigated by calculating relevant micro-parameter and phonon contribution ratio. Meanwhile, the studied tellurite glass possesses good thermal stability. The present work indicates that Pr3+/Nd3+ codoped tellurite glass is an excellent gain medium for potential O+E+S-band broad optical amplifiers.     

电导率仪检定结果的不确定度分析

文章首先对电导率仪的不确定度来源进行了分析,建立了相关数学模型,对各个分量的标准不确定度进行了评定,同时也求出了合成标准不确定度及扩展不确定度,确保电导率仪测量时的准确性和溯源性。