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电磁波普 The Electromagnetic Spectrum

论文作者:www.51lunwen.org论文属性:学术文章 Scholarship Essay登出时间:2014-05-24编辑:auditjiang点击率:5401

论文字数:1861论文编号:org201405241051315284语种:英语 English地区:中国价格:免费论文

关键词:Electromagnetic Spectrum丨能量输出丨Sven main regions丨频率丨Rdio waves

摘要:本文介绍电磁波谱的七大分部和电磁波谱的频率。并介绍了乔治亚理工大学的研究人员发现了一种从空气中的电磁波获取能量方法。收集设备通过使用喷墨打印机,可以收集少量的从宽带—从调频收音机的频率到达雷达的能量。

The Electromagnetic Spectrum 电磁波普


Turning radio waves into power  无线电波转化为能量
Researchers at Georgia Tech have found a way to harvest energy from electromagnetic waves in the air. The harvesting devices are produced using an inkjet printer and can collect small amounts of power from a wide band of frequencies--everything from FM radio up to radar.
乔治亚理工大学的研究人员发现了一种从空气中的电磁波获取能量方法。收集设备通过使用喷墨打印机,可以收集少量的从宽带—从调频收音机的频率到达雷达的能量。
The technology isn't new—researchers have floated concepts (and a few devices) that can harvest energy from ambient WiFi signals and other small sources, but these are usually able to pull power only from tiny slices of the electromagnetic spectrum (perhaps just a few KHz). The new system can draw energy from much wider electromagnetic swaths: 100MHz to 15GHz.
技术不是新研究人员提出的概念(和一些设备),可以获取能量和其他小型的WiFi信号来源,但这些通常只能从电磁波谱的获取小片(也许只有几千赫)能量。
Even better, the sensors that harvest the energy are simple to make. To print the circuits on paper or paper-like polymers, the researchers use an inkjet printer and add an emulsion of nanoparticles. Circuits printed on polymers are currently less advanced, but the scientists say they have a wider range and can harvest energy from frequencies up to 60GHz.
Gadgets such as cell phones could one day use residual radio signal to supplement their own batteries, but the amounts of energy harvested are small (on the order of 50 milliwatts) and the system won't currently make even small consumer devices self-sustaining.
However, if the energy is allowed to build up in a small capacitor, it could temporarily power low-energy intermittent devices like temperature sensors or could supplement other energy-gathering mechanisms like solar panels. The harvesters could also function as mission-critical stopgaps, allowing a system to maintain essential functions or send out a distress signal until it can be fixed.
Electromagnetic waves provides thorough explanations and relevant, modern examples so that students and practicing engineers will find it a useful reference as well as a tool for self-teaching. It emphasizes basic concepts from both a physical and mathematical perspective. Successive chapters move from simple wave propagation in unbounded free space to the complexities of resonator and antenna design, revisiting basic concepts as each new topic is introduced. Electromagnetic Waves also makes connections between electromagnetics and simple equivalent circuit models wherever possible. The book exposes its readers to a considerable array of mathematical tools as well, ranging from orthogonal function expansions to perturbation techniques and duality, but physical intuition and approximate problem-solving techniques are also emphasized.

The electromagnetic spectrum is the entire range of radiant energies
or wave frequencies.

There are seven main regions in the electromagnetic spectrum. These
are: radio waves, microwaves, infrared, visible light, ultraviolet,
x-rays and gamma rays. Each section of the EM spectrum has a different
wavelength, these are shown in the table below

Section of EM spectrum

Wavelength (in cm)

radio waves

> 10

microwaves

10 à 10

infrared

10 à 10

Visible light

10 à10

ultraviolet

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