VOA慢速英语2015 能每秒拍摄数十亿张照片的相机_
时间:2018-12-16 作者:英语课 分类:2015年VOA慢速英语(一)月
New Camera Takes Billions of Pictures Every Second 能每秒拍摄数十亿张照片的相机_
Imagine a camera that can take one hundred billion pictures a second -- that is enough to record the fastest movements in the universe.
But we do not have to imagine it, because a scientist has invented such a camera. He calls it an imaging system. It may seem like science fiction, but it is science reality.
Lihong Wang is a biomedical engineer at Washington University in St. Louis, Missouri. He leads a team of researchers who have discovered several new imaging techniques.
“For the first time, humans can literally 1 see light pulses traveling in space at the speed of light.”
The speed of light is almost 300 million meters per second. At that speed, it would take just one second to travel around the world seven-and-a-half times. Mr. Wang photographs light particles moving at that speed using a unique camera.
“The streak 2 camera is a very specialized 3 device that allows us to convert time into space. We convert light particles, or photons, into electrons, then pull the electrons, really hard, at different rates, depending on the time of arrival. So the time of arrival will be converted into different vertical 4 positions.”
Mr. Wang’s new technology improves on other ultra-fast cameras in important ways. Until now, streak cameras could only take a one-dimensional photograph. That is like looking through a vertical opening and trying to take a picture of something flying by really fast.
The fastest cameras had to have an external, or outside, light source to work. But Mr. Wang’s technique does not need special lighting 5. It produces two-dimensional images like regular photographs, but at a speed of one image every 10 trillionths of a second.
Brian Pogue is a biomedical engineer at Dartmouth College in the eastern American state of New Hampshire. He reviewed the new imaging system for the science publication Nature. He says this new way of seeing the movement of light could lead to major scientific discoveries in areas like optical cloaking.
“Cloaking” is a kind of technology that can make an object -- like a spaceship -- seem to disappear. Mr. Pogue says the military would like to use cloaking.
“There’s a lot of interest in getting light to bend around objects, so it sort of looks like you’re seeing through them.”
Brian Pogue says Mr. Wang’s new system lets researchers photograph light as it bends. He says they have not been able to do that until now. He says this development could help make optical cloaking a reality.
Lihong Wang imagines other uses for the new camera in such scientific fields as molecular 6 biology and astronomy. He says ultrafast imaging could lead to new discoveries.
Words in this Story
astronomy – n. the scientific study of stars, planets, and other objects in outer space
optical – adj. relating to or using light
cloak – v. to hide or disguise something
molecule 7 – n. the smallest possible amount of a particular substance that has all the characteristics of that substance
technique – n. a way of doing something by using special knowledge or skill
- He translated the passage literally.他逐字逐句地翻译这段文字。
- Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
- The Indians used to streak their faces with paint.印第安人过去常用颜料在脸上涂条纹。
- Why did you streak the tree?你为什么在树上刻条纹?
- There are many specialized agencies in the United Nations.联合国有许多专门机构。
- These tools are very specialized.这些是专用工具。
- The northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
- Vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。
- The gas lamp gradually lost ground to electric lighting.煤气灯逐渐为电灯所代替。
- The lighting in that restaurant is soft and romantic.那个餐馆照明柔和而且浪漫。