103 Remote Control-Mid

Remote Control FOCUS Question How do remote-controlled devices work?

远程控制焦点问题远程控制设备如何工作?

Controlled from Afar There was a time, not so long ago, when you had to climb off your couch and walk to push buttons or turn a dial to change channels on your TV. But today you can channel surf from the comfort of your favorite chair. Remote control is everywhere. It can operate everything from music players to vacuum cleaners. We also use remote control to operate toy cars, toy planes, and drones. In 1898, the Electrical Exhibition was held in New York City's Madison Square Garden. Scientist Nikola Tesla showed off what was perhaps the first remote-controlled device He steered a metal model ship around a large container of water. Tesla's boat was an instant hit with the public Remote control had arrived!

曾几何时，就在不久前，你不得不从沙发上爬起来，走着去按按钮或转动转盘来换电视频道。 但今天你可以舒适地坐在你最喜欢的椅子上换台了。 远程控制无处不在。 它可以操作从音乐播放器到吸尘器的所有东西。 我们还使用遥控器来操作玩具汽车、玩具飞机和无人机。 1898年，电气展览会在纽约市的麦迪逊广场花园举行。 科学家尼古拉·特斯拉展示了可能是世界上第一个遥控设备。他驾驶一艘金属模型船绕过一个装满水的大容器。 特斯拉的船立刻受到了公众的欢迎遥控器来了!

Two Technologies There are two main types of remote control. One uses infrared waves to control objects that are nearby. The other uses radio waves that can control nearby objects as well as objects that are farther away. Infrared and radio waves are both types of electromagnetic energy. This type of energy travels away from a source in waves that move at the speed of light. Similar to visible light, infrared and radio waves can be identified by their wavelengths on the electromagnetic spectrum (see below). Wavelength is the distance between the peak of one wave and the peak of the wave next to it. But unlike visible light, we can't see these forms of energy.

遥控器主要有两种类型。 一种是利用红外线来控制附近的物体。 另一种使用无线电波，可以控制附近的物体以及更远的物体。 红外线和无线电波都是电磁能量。 这种类型的能量以波的形式从一个源出发，以光速移动。 与可见光类似，红外线和无线电波可以通过电磁波谱上的波长来识别(见下文)。 波长是一个波的峰值和它旁边的波的峰值之间的距离。 但与可见光不同的是，我们看不到这些形式的能量。

Infrared Remote Control Most home remotes use infrared energy. You point the remote toward the object you want to control, such as a flat-screen TV, and push a button. The remote sends pulses of light from a light-emitting diode (LED). The object has a detector that picks up the pulses of light and then processes the information from the pulses. The pattern of light pulses tells the object what to do. Infrared technology is portable and requires little power— often just small batteries. Also, the light pulses aren't disrupted by signals from other devices. But infrared remotes only work over short distances, and people or walls can easily block the light pulses. The light must travel directly to the detector for the remote to work.

红外线遥控器大多数家用遥控器使用红外线能量。 你把遥控器对准你想控制的物体，比如平板电视，然后按下一个按钮。 遥控器通过发光二极管(LED)发送光脉冲。 这个物体有一个探测器，可以接收光脉冲，然后处理来自脉冲的信息。 光脉冲的模式告诉物体该做什么。 红外线技术便携，耗电少——通常只需要小电池。 此外，光脉冲不会受到其他设备信号的干扰。 但红外遥控器只能在短距离内工作，人或墙很容易阻挡光脉冲。 光必须直接传播到探测器，遥控器才能工作。

Many people use infrared light every day. Television remote controls use this technology. Infrared remotes can also control DVD players, CD players and other music players from a distance. Even some gaming systems use infrared. Their controllers use LEDs to communicate with a sensor bar to detect movement. Entertainment is not the only reason we use remote controls in our homes. These wireless devices can also operate home security and other systems, such as curtains and thermostats. If you feel tired, you could stay in bed and use an infrared remote control to close the curtains. Instant nap time!

许多人每天都使用红外线。 电视遥控器使用这种技术。 红外线遥控器还可以远程控制DVD播放器、CD播放器和其他音乐播放器。 甚至有些游戏系统也使用红外线。 它们的控制器使用led与传感器条通信来检测运动。 娱乐并不是我们在家里使用遥控器的唯一原因。 这些无线设备还可以操作家庭安全系统和其他系统，如窗帘和恒温器。 如果你觉得累了，你可以躺在床上，用红外遥控器把窗帘拉上。 即时午睡时间!

Radio Remote Control Radio-controlled (RC) devices operate with radio wave technology. An RC remote control contains a transmitter that sends out radio waves to an object you want to operate. The radio waves travel at the speed of light! The object has a receiver that "catches" the signal. The receiver then interprets the signal and tells the object what to do. Radio waves work at longer ranges than infrared waves do. The receiver doesn't have to be in a direct line with the transmitter to work, just within range. And people or walls won't block the radio waves. However, other devices can interfere with radio waves and make it hard for the receiver to interpret the signal.

无线电遥控无线电控制(RC)设备使用无线电波技术。 RC遥控器包含一个发射器，可以向你想要操作的物体发送无线电波。 无线电波以光速传播!这个物体有一个“捕捉”信号的接收器。 然后接收器解释信号并告诉物体要做什么。 无线电波的工作范围比红外线更远。 接收器不必与发射器在一条直线上，只要在范围内就可以工作。 人或墙也不会阻挡无线电波。 然而，其他设备会干扰无线电波，使接收器难以解释信号。