中国首次完成地月激光测距
文章来源:未知 文章作者:enread 发布时间:2018-01-24 08:45 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
China has accomplished1 its first successful Lunar Laser Ranging (LLR), with a 1.2-meter telescope laser ranging system.
 
中国利用一架1.2米的激光望远镜测距系统成功完成月球激光测距。
 
 
Based on the signals of laser pulses reflected by the lunar retro-reflector planted by the U.S. manned mission Apollo 15, the applied2 astronomy group from the Yunnan Observatories3 measured the distance between the Apollo 15 retro-reflector and the Yunnan Observatories ground station to be 385823.433 kilometers to 387119.600 kilometers, from 9:25 p.m. to 10:31 p.m. Beijing Time, on Jan. 22, 2018.
 
Theoretically, LLR measures the distance between the Earth and the moon by calculating the time a laser pulse takes to travel from a ground station on Earth to a retro-reflector on the moon and back again. 
 
LLR technology traverses fields such as laser and photoelectric4 detection, automatic control and space orbiting. Compared to other methods, LLR can achieve the highest accuracy of distance measurement between the Earth and the moon. 
 
"Although LLR in China has not achieved the same level as pioneering countries like the U.S., our initial success still means the progress, which started from scratch," said Li Yuqiang, an associate researcher with Yunnan Observatories. 
 
Results of LLR are vital to advanced research in astro-geodynamics, Earth-moon system dynamics5 and lunar physics. Until China made its first LLR, only the United States, France and Italy had successfully harnessed the technology. 


点击收听单词发音收听单词发音  

1 accomplished UzwztZ     
adj.有才艺的;有造诣的;达到了的
参考例句:
  • Thanks to your help,we accomplished the task ahead of schedule.亏得你们帮忙,我们才提前完成了任务。
  • Removal of excess heat is accomplished by means of a radiator.通过散热器完成多余热量的排出。
2 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
3 observatories d730b278442c711432218e89314e2a09     
n.天文台,气象台( observatory的名词复数 )
参考例句:
  • John Heilbron, The Sun in the Church: Cathedrals as Solar Observatories, 3-23. 约翰.海耳布隆,《教会里的太阳:教堂即太阳观测台》,第3-23页。 来自互联网
  • Meteorologists use satellites, land observatories and historical data to provide information about the weather. 气象学家使用卫星、上天文台和历史资料来提供有关天气的信息。 来自互联网
4 photoelectric WNkxd     
adj.光电的,光电效应的
参考例句:
  • Photoelectric spectrophotometers give better result.用光电分光光度计能得到较佳结果。
  • Einstein also explained a baffling feature of the photoelectric effect.爱因斯坦也解释了光电效应里一个令人困扰的现象。
5 dynamics NuSzQq     
n.力学,动力学,动力,原动力;动态
参考例句:
  • In order to succeed,you must master complicated knowledge of dynamics.要取得胜利,你必须掌握很复杂的动力学知识。
  • Dynamics is a discipline that cannot be mastered without extensive practice.动力学是一门不做大量习题就不能掌握的学科。
TAG标签: laser lunar distance
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