Oven Magnetron
What is the actual voltage (amplitude) of a micro-wave in a microwave oven?
Microwaves plug into a wall socket with 110V, the magnetron is supplied with 3-5kV from the MOT, But what is the actual voltage (amplitude) of the micro-wave(s) within the microwave oven?
i will address this as follows. The output of the microwave magnetron is on the order of 1 kW. this power is fed into a cavity (the microwave box) that is about 1 square foot in area. So you can just say that you have and intensity of 1kW/1squarefoot ~ 1kW/1000cm^2 = 10^4W/m^2.
The intensity is related to the electric field by I = c*epsilon/2*E^2. So,
E= (10^4W/m^2*2/c/epsilon)^(1/2) ~ 2.7 kV/m
This means that from top to bottom the voltage difference in a microwave is about 1000 volts (assuming the way I did it is right, which I do not guarantee).
I assumed the power was distributed totally evenly over the inside of the microwave and it propagated from one side and was totally absorbed or left the other side without being reflected. Feel free to expand on what I did to get a more realistic answer.
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You can scarcely find a household which does not have a microwave oven to use. In fact, it is difficult to imagine life without the oven. Not only does it cook food in minutes, but it is also very convenient to use. Given that we use the oven for small things like getting hot water, it is imperative that we know how to take care of the device and learn everything about its safety aspects. The US government has made it compulsory for all ovens to pass the FDA/CDRH requirements. It lays down certain parameters which are to be satisfied like the amount of microwave radiation leakage. There are procedures which see to it that these requirements are met.
Making a stitch in time:
Most of the issues about safety measures are made by the employees working on these microwave ovens. They voice their fears about what happens when somebody damages an oven by accident or becomes ill as a result of exposure to these microwaves. These problems must be addressed by the company so that it does not go out of hand. Doing nothing about it will only spiral the problems and make the employees more disturbed. An example of this can be the pacemaker issue which suggested that running a microwave oven can prove to be detrimental to your cardiac pacemakers. A notice had to be posted on each oven to warn users who used pacemakers. However, the evolution of the oven has proved this concern to be baseless now.
How can the oven be damaged?
Concern over the safe use of microwave oven arises when it is damaged. Damage can occur in various ways. A high voltage arc inside the oven due to the presence of metal elements can be a good reason for damage. Sometimes, there is a failure in the locking system of the door which leads to microwave leakage. Accidentally dropping the oven can also lead to damage of the oven. The switches, enclosure, power supply and everything else might be harmed. Nowadays, microwave ovens are not prone to any leakage of microwaves. Unless there is a breakage in the equipment, you should not be bothered with this problem.
Design of the oven:
The microwave oven is so constructed that there can be no undue harm to the user unless there is an accident. The metal housing contains the microwaves and lines the inner compartment of the oven. You can watch the inside of the oven while it is working, but the door prevents the microwaves from passing outside. Also, the magnetron tube which produces the microwaves is deactivated when you open the door by mistake. Most microwave ovens are free from the fear of electrical and fire hazards. Thus, the basic design of the oven guarantees safety.
Keep a close watch over things:
If you own a site which sells microwave ovens, then you do need to keep certain things in mind. Since it is practically impossible to keep checking for microwave leakage, you can reassure yourself in other respects: make a note of the serial number, wattage, model, location, year of manufacture and contact person; attach a document which specifies all safety aspects on the oven; if you suspect any leakage of microwaves, either repair it or discard the device.
You should always make it a point to keep proper documentation of the safety procedures. Although, it is not a very big issue, yet all safety measures should be taken since it concerns the lives of so many people using a microwave oven. Taking the right step today will make sure that you have a future free from the torture of any safety issues.
About the Author:
You can have access to articles about microwave oven in portuguese language from page Microwave_Oven
Roberto Sedycias works as IT consultant for Polomercantil
Article Source: ArticlesBase.com - Microwave Oven - Handy Tips For The Safe Use
Filed under: Appliances
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