用自制总积分散射仪评估SiC基底表面改性效果

根据总积分散射理论自制了半球式总积分散射仪,建立了系统规范的测试方法,并应用其对工程中SiC基底表面改性的效果进行了相关检测和评估。改性后RB-SiC和S-SiC基底的散射系数分别降低到2.86%和1.53%,已接近于抛光良好的微晶玻璃的水平(1.38%)。该散射仪的优点是操作简单、方便快捷、不接触样品、对表面无损害。通过对测试数据的分析可知,从散射特性角度对SiC基底表面改性效果进行评估是合理有效的。把相关测试结果与分光光度计的测试结果对比,测量偏差在1.1%左右,说明该总积分散射仪的测试结果准确可靠。

超光滑镜面散射测量方法研究

光学散射会对光学系统造成系统损耗,成像质量下降等危害。针对高反镜的散射光在光学系统中的影响,本文提出了使用总积分散射法来测量散射光总量,得到散射光在总反射光中所占的比值。该方法运用总积分散射理论,并结合积分球的光度特性,搭建了比较法总积分散射仪,测试了镀银膜的高反镜的总积分散射。实验结果表明,该装置测得的总积分散射值与用德国汉诺威激光中心生产的总积分散射仪得到的测量结果非常接近,均在300 ppm^500 ppm之间,验证了该装置的可行性。

Future Trends of Deep Sea Bed Mining Technology

The present status of deep sea bed mining technology for polymetallic nodules has been critically examined in light of its history of development the UNCLoS (the United Nation Convention on the Law of the Sea) regime and the current trends in research.The critical technologies have been highlighted and the need for system integration underscored. The deep sea bed environment and the engineering challenge were presented and the necessary features of the deep sea bed mining system for commercial mining was analyzed. The key accomplishments, problems and future bends in research in the development of the mining system are also discussed. Finally, it points out that the technology gaps can be filled by the bine commercial mining is undertaken as a result of market conditions in its favor.