Learn from domestic microwave oven microwave works
The key component is the microwave oven magnetron. The name sounds like a science fiction movie in a unit of military equipment - such advanced vacuum generated by the microwave really powerful enough for military radar (which is the original purpose of the development of the magnetron). Microwave not with flame or heat generated by the coil from an external heating of food, but to microwaves penetrate the food, the heat generated in its interior.
Since the 1950s, microwave into people's lives, but some people seem to still worried of this technology, they are worried about microwave flying out through the door, harm our bodies - especially our eyes. In fact, this will not happen, because the microwave oven door will be embedded in the laminated glass reflected back in the wire mesh. Professor of physics at the University of Virginia Lewis • A • Bloomfield (Louis A. Bloomfield) said: "The holes in the wire mesh is much smaller than the wavelength of the microwave, so it can play the same physical metal reflector role."
Several years ago, a number of nutritionists worry microwave will destroy the nutritional content of food. However, some studies have come to the contrary conclusion: all cooking methods will destroy the vitamin, the extent of damage depends on the temperature level and the length of the cooking time. Most studies show that microwave does not produce extreme high temperature, as compared with the gas stove or oven, it requires less cooking time actually. The method of using heat to cook food for the destruction of vitamins and nutrients but is particularly serious.
Microwave oven will affect the Wi-Fi network? This is the recent emergence of a concern. Tightly sealed microwave will not happen, because the electromagnetic radiation can leak out from the microwave. However, still a very small leakage of microwave may cause some interference. Bloomfield said: "The wireless transmission is extremely sensitive to electromagnetic radiation, one billionth of a magnitude of leakage on our body, it will never have the slightest feeling, but the Wi-Fi signal will be affected."
Water molecules are present in most foods. Water molecules of the "bottom" are respectively provided with positive and negative charges. Electric field causes the water molecules positively charged end point in the same direction. Microwave electric field of the positive and negative directions convert 4.9 billion times per second, the water molecules are constantly followed by conversion direction. As the water molecules constantly turn, collide with each other, thereby generating friction heat. Ceramics and glass containers without water, and therefore no heat, but may become hot food by heat conduction so that they become hot.
Transformers, diodes and capacitors will improve public electricity from 220V to 3000V or more, sent through the wire to high voltage magnetron. Magnetron generates microwaves, microwaves sent out from the antenna via a waveguide (waveguide) into the furnace chamber, a metal cavity wall continuously reflected microwaves. Rotating glass tray makes uniform heating of food. Some models of the microwave oven without glass tray, but the end of the waveguide has a small rotating blade, it will be fully spread on the microwave.
Transferred to the high-voltage cathode filaments. After the filament heats will emit electrons, which are peripheral to attract the positively charged anode plate. Some large magnet block the outward flow of the magnetic field applied to the electron cloud rotation. During rotation, the electron cloud spoke-like form, between the anode plate through each cavity. Moving the electron cloud "spokes" of the negative charge transfer to the cavity, then the next one negative charge would "spokes" outflow cavity prior to arrival. The repeated change in negative charge in the cavity generates an oscillating electromagnetic field 2.45 gigahertz. The antenna of the magnetron frequency of resonance of the microwave emitted from the top edge - this is the principle of radio transmission antenna is almost exactly the same.
◆ whir: microwave whirring sound has nothing to do with the magnetron magnetron resonance frequency is very high, much higher than the human ear can hear sound frequencies. This noise comes from a fan for cooling the magnetron.
◆ buzz: Microwave ovens will produce a hum. This noise comes from the transformer, diodes, and capacitors. They are in the 50 Hz power outlet voltage is gradually increased current will produce vibration, hums.
◆ Sparks: Everyone that metal objects can cause sparks inside a microwave, but the situation is not entirely true. A microwave cavity wall is actually made of metal. Sparks caused by the accumulation of charged particles, a short distance when the voltage on the occurrence of significant changes, these charged particles will suddenly issued arc. A flat circular metal plate, the charge will disperse into the surrounding space, to prevent charge accumulation; those microwavable pizza tray, or a sandwich bag, above there is a metal coating, they will become very hot, cooked the food, but does not produce sparks. However, some with sophisticated metal objects, such as fork tines or aluminum foil many thin edge, will gather the charge, but also lead to local voltage drop, and this will produce a corona discharge (corona discharge), that is, we see sparks.
◆ thaw: the former microwave oven in the "thaw" or a low power mode when not using the method of adjusting the size of the magnetron power, but by continuously opening and closing the magnetron to achieve. Therefore, in the cooking process, the magnetron is off to work at full capacity, we can clearly ears hear it constantly on and off. Some new microwave oven uses a pulse width modulator (pulsewidth modulator), a huge piece of circuit board can regulate the power transformer, thereby reducing the power of the microwave oven.

 

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