Measurement

I go to that pleace which is my set and do some measure by a portable device for sensing and measuring microwave energy. After that I draw a picture to describe the change of the microwave radiation intensity in this area. The section which is close to yellow have the higher intensity. The unit for microwave radiation intensity is mW/cm2. The picture show the change of intensity from 0.01mW/cm2 to 0.9mW/cm2, so every section represent about 0.1mW/cm2.




So, from this, I make a plan for disposal of my project.

Some Research on microwave

Definition

As we know, Microwaves are electromagnetic waves with wavelengths ranging from 1 mm to 1 m, or frequencies between 0.3 GHz and 300 GHz.

Apparatus and techniques may be described qualitatively as "microwave" when the wavelengths of signals are roughly the same as the dimensions of the equipment, so that lumped-element circuit theory is inaccurate. As a consequence, practical microwave technique tends to move away from the discrete resistors, capacitors, and inductors used with lower frequency radio waves. Instead, distributed circuit elements and transmission-line theory are more useful methods for design and analysis. Open-wire and coaxial transmission lines give way to waveguides, and lumped-element tuned circuits are replaced by cavity resonators or resonant lines. Effects of reflection, polarization, scattering, diffraction, and atmospheric absorption usually associated with visible light are of practical significance in the study of microwave propagation. The same equations of electromagnetic theory apply at all frequencies.

While the name may suggest a micrometer wavelength, it is better understood as indicating wavelengths very much smaller than those used in radio broadcasting. The boundaries between far infrared light, terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study. The term microwave generally refers to "alternating current signals with frequencies between 0.3 GHz (3×108 Hz) and 300 GHz (3×1011 Hz)." Both IEC standard 60050 and IEEE standard 100 define "microwave" frequencies starting at 1 GHz (30 cm wavelength).

Electromagnetic waves longer (lower frequency) than microwaves are called "radio waves". Electromagnetic radiation with shorter wavelengths may be called "millimeter waves", terahertz radiation or even T-rays. Definitions differ for millimeter wave band, which the IEEE defines as 110 GHz to 300 GHz.

Cooking

Microwaves are used in radar, in radio broadcasting, in satellite communications, and in microwave heating and cooking.
In microwave cooking, microwaves are used to transfer energy to food. The frequency of the microwaves matches the natural frequency at which the water molecules in food vibrate. The vibration energy of the water molecules represents in an increase in temperature, which cooks the food.

Microwave station

A very useful device for communications, it is the basic framework in modern communication system. Our mobile phone are connected by them. Even most scientist believe lower frequency microwave will not have a lethal harm for human, however, living in this radiation for a long time will also infaust for people. So most microwave stations are unattended now.

Microwave power transmission

Microwave power transmission (MPT) is the use of microwaves to transmit power through outer space or the atmosphere without the need for wires. It is a sub-type of the more general wireless energy transfer methods, and is the most interesting because microwave devices offer the highest efficiency of conversion between DC-electricity and microwave radiative power.

Following World War II, which saw the development of high-power microwave emitters known as cavity magnetrons, the idea of using microwaves to transmit power was researched. In 1964, William C. Brown demonstrated a miniature helicopter equipped with a combination antenna and rectifier device called a rectenna. The rectenna converted microwave power into electricity, allowing the helicopter to fly[1]. In principle, the rectenna is capable of very high conversion efficiencies - over 90% in optimal circumstances.

Most proposed MPT systems now usually include a phased array microwave transmitter. While these have lower efficiency levels they have the advantage of being electrically steered using no moving parts, and are easier to scale to the necessary levels that a practical MPT system requires.

Using microwave power transmission to deliver electricity to communities without having to build cable-based infrastructure is being studied at Grand Bassin on Reunion Island in the Indian Ocean.

A NEW START – Term 2

Last term is not very satisfactory. I do not express my idea very well, but in this term, I will try to change the deteriorating situation.

The Aim

Last term I did a sample project which is a network in the forest. It is not all of my idea. In this term, the project will be going forward. Actually, I want create a biologic factory which can grow by himself. The sample network changes to a complicated system. This change based on the evolution of individual device (the “flower”) in the network. All this process like the growing plant -- every same cell in the seed grow to the different part and function—leafage, base, branch—after the different activities.

The Set

The set I chose is in east of London-- The Ripple Nature Reserve. This area is a industrial area, and there are a very large power station-- Barking Power Station—beside the set. Set among the industrial landscape of Barking Riverside and once a dumping area for pulverized fuel ash, The Ripple provides a fascinating example of how nature can reclaim industrial wasteland. The dumping of fuel ash has created a soil that is very alkaline and therefore different to most soils in London (they are mostly acidic). This means that many plant species that can tolerate the soils of The Ripple struggle to grow elsewhere locally.

The Ideas

The set is a fantastic place for my project. There is a big electric transformer substation and Microwave Station near the set. When it works, it will set off the stronger microwave radiation. All the set will be covered by this radiation, but the levels of the intensity are different, which means the area closer to the transformer substation has a high level of microwave radiation. It is one of the outside environment effects for the “network”. The device (the “flower”) in high level area will activate by this situation, and grow to a “protector” which like a protect wall to reduce the level of intensity behind it. In additional, microwave radiation is a type of energy, so the other device (the “flower”) grows to the “receiver” which can receive the radiation for energy. And also the device (the “flower”) on the land activates by the high level of alkaline in the soil, and grows to a neutralization device. There are many other kind of direction of growing, like to a “reactor” which is only used for compose the organic compound, “storage” for store the energy and organic compound. Finally the device (the “flower”) will grow to some habitat for animal, like the birds nest or honeycomb. It will form a self-growing biologic factory system.