英国皇家科学院圣诞讲座：让火花飞（2014）

我喜欢你的项链
I really like your necklace as well.
很漂亮的灯泡
Good light bulb!
好的
OK.
罗欣 这里有两台笔记本电脑
What we have, Rosheen, is two laptops
和一把手电筒
and a torch.
这台笔记本正在播放一个短片
And what we have is this laptop is running a movie.
我想让你做的是
What I would like you to do is
将这台电脑里正在播放的短片
to be able to carry the information that's on this laptop
通过无线的方式
which is just playing a little movie
传送到另一台电脑里
and send it wirelessly to that laptop.
你只需要转动一下这把手电筒
All you need to do is turn that torch
把它对着那边的那台笔记本
so it faces the laptop over there.
你可以把它放下 不需要一直拿着它
So you can place it down - you don't need to hold it.
这台电脑里正在播放的短片
There is the movie playing over here
也同时在那台电脑里播放
and the same movie is playing on that laptop as well.
为了证明这个确实有效
Just to prove that this works,
我们再把手电筒移开一下
just angle that torch away again.
让它偏离系统
So it is out of the way of the system.
现在那边的短片已经停止播放了
Now, that one has stopped.
我们检查一下这边的是否还在播放
Let's check this one is still working.
过来一下这边 没错
Come round here. So, yeah,
这边的电脑仍在播放短片
the video is still playing here
但那边的已经停止播放了
but it's stopped over there,
我们通过移开光源让短片停止播放了
so we've stopped the movie by just removing the light.
再照射一次确保我们没弄错
Shine it back again to make sure we have got it.
接下来短片会再一次同步播放
And then the movie should start playing again
已经开始播放了
and it is starting to play.
要做到这一点只需要这把手电筒
All we are doing is using this torch.
在这把手电筒里有许多LED
Inside this torch there are lots of LEDs
它们每秒可以闪烁数百万次
and they are flashing millions of times a second,
就像是莫尔斯密♥码♥
so it is like the old Morse code.
未来
In the future
我们也许能像刚才那样用光
we might be able to send information over the Internet to laptops,
通过网络向电脑传送信息
just like Rosheen's been doing there.
这样可以释放无线网络频段
This would free up the space in the Wi-Fi networks
防止过多的干扰
and prevent a lot of further interference.
谢谢罗欣 谢谢你的帮忙
But thank you Rosheen for your help.
遗憾的是
Now, sadly,
光照上网技术对我们的游戏来说太先进了
Li-Fi was too advanced for our Tetris game.
如果像刚才罗欣做的那样
If we shined lots of lights,
让很多灯光一起闪烁
like Rosheen had there,
我们可能都看不见游戏的亮光了
we wouldn't see our own Tetris-style game lights.
我们可以给每盏台灯
We could fit several switches
都装上开关
to every lamp
然后发送无线信♥号♥♥而不是光照信♥号♥♥
and send a Wi-Fi signal instead of a Li-Fi signal.
但我们的路由器只能在有限范围内工作
but our router only works over a very small distance
而大楼是相当大的
and our building is actually pretty big.
所以我们需要一些更大的
So, we need something bigger,
能覆盖体育场大小范围的路由器
something stadium-size.
大家都带着手环吗
Is everyone wearing their wristbands?
带着吗 举起来 就像这样
Yeah? Hold them up in front of your faces. Like this.
我感觉被冷落了 因为我没有
I feel very left out because I don't have one!
好的 麻烦调暗一点灯光
Right. Can we dim the lights, please?
能激活这些手环吗
And can we activate the wristbands?
真漂亮
That looks amazing.
我感觉没那么被冷落了
I don't feel so left out
因为家长和老师们也没有手环
because the parents and teachers don't have them either.
看着真不错
It looks pretty good, doesn't it?
棒极了
Looks fantastic.
这叫做玩酷手环
Right, these are called Xylobands.
为了更好地解释它的工作原理
To help us explain how xylobands work,
让我们有请吉姆·雷格勒
please welcome Jim Regler.
嗨 吉姆
Hi, Jim.
这些手环看着真不错
They look brilliant.
这些手环真的太棒了
These look absolutely fantastic.
-这条手环是给你的 -太好了
- This one is for you. - Brilliant.
这条手环上全是LED
This is a wristband that has LEDs all round the strap
这里有个小小的无线电接收器
and a small radio receiver here.
我们可以通过遥控器控制它
Which we can control using this remote control.
没错 好的
Right. OK.
你可以试试按下遥控器上的按钮
And if you would like to press some buttons on the remote control?
如果按下这个按钮
If you press this button here,
灯光会变成绿色
they will turn green.
如果按这个
If you press this button,
-会变成红色 -真棒
- they will go red. - Fantastic.
如果我们按下"闪动"按钮
If we press the GLOW button,
它们会漂亮地闪烁起来
they will start to glow nicely.
真是太棒了
This looks brilliant by the way.
从下面看非常美
Fantastic from down here.
我知道你其实也可以把它们分组
I know you can actually group these as well,
那这些手环是如何知道自己在哪个组的
so how do the wristbands know which group they are in?
我们对手环所做的就是
What we can do with the wristbands,
根据它们所在不同区域给它们分组
we can tell them which group they are in by zone
我可以按这个按钮来演示一下分区
and I can demonstrate the zoning by pressing this button here.
好极了
Excellent.
显然它们按分区的指示做出了反应
They obviously respond when they are told to by zone.
太棒了
Fantastic.
你知道 吉姆
As you know, Jim.
今晚我们正尝试在一栋摩天大楼上
we are trying to build a giant games console
建造一台巨型游戏机
on a skyscraper this evening.
这需要我们的无线信♥号♥♥长距离传输
We need our Wi-Fi signal to go quite long distances.
这种技术能够传输的距离有多远
So, how far have you got in terms of distance here?
我们已经在大型体育场
We have built this system
和演唱会使用过这套系统
to run stadiums and concerts.
覆盖范围达到500米
so we have successfully covered distances
甚至更远
up to 500 metres and beyond.
很好 真的很厉害
Brilliant. That's really good.
我们有一段酷玩乐队演唱会的镜头
I think we have got some footage here, showing a Coldplay concert.
看起来棒极了
Wow, look at those...That looks awesome.
当时有多少人
How many were there?
三万人
30,000.
三万人 看到这项发明在眼前呈现
30,000! That must have been an amazing moment
那一刻一定非常壮观
just to see that invention come to life.
非常棒
Absolutely fantastic.
非常感谢你 吉姆
Thank you so much, Jim.
我现在不再感觉被冷落了
I don't feel as left out now,
我也有一条手环了
I have one!
看起来真的非常棒
It looked brilliant. Fantastic.
即使我们只有三百人
Even just 300 of us,
可以想象一下三万人的场面是多么壮观
so imagine what it would look like with 30,000?
现在 我们之所以采用这些手环
Now, we considered using these wristbands
是因为上面有LED
because they have got LEDs,
我们可以从一个中心点无线遥控它们
we can control them wirelessly from a central point,
甚至可以实现单独
we can even control them individually
或分组控制
or in groups.
并且它们的造价很便宜
And they are cheap to produce.
这一切看起来都很棒
So, this all sounds fantastic.
但问题是
But the problem with these is
手环的灯光对我们来说不够亮
the lights just aren't bright enough for us.
所以我们需要的是
So we need something that is really similar technology
和这种技术非常类似
that we have all got here,
但更亮一些的技术
but something a little bit brighter.
我们又去了一趟DIY商店
So, we had another trip to the DIY store
买♥♥了一些LED灯泡
and we bought some LED bulbs.
但它们稍微有些不同
But these bulbs are just a little bit different.
这就是我们的灯泡
What we have is this bulb
我们把它拆开了
but we have exploded it out here,
让大家看看里面的样子
just to show you what is inside it.
灯泡外层有一些玻璃
Now, there is some glass around this bulb,
那只是用来使光线漫射的
but it is actually just used to diffuse the light.