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Microwaves

Microwaves. Dave Klamer May 8, 2001. What is a “Microwave?”. Part of the RF spectrum 1 - 300 GHz. A microwave oven. 800-900 MHz. 50-600MHz. Uses of Microwaves. Cooking. Communication Radios Satellites RADAR. Medicine. Astronomy. How A Microwave Oven Works.

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Microwaves

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  1. Microwaves Dave Klamer May 8, 2001

  2. What is a “Microwave?” • Part of the RF spectrum • 1 - 300 GHz • A microwave oven 800-900 MHz 50-600MHz

  3. Uses of Microwaves • Cooking • Communication • Radios • Satellites • RADAR • Medicine • Astronomy

  4. How A Microwave Oven Works Electricity flows from from the wall, through fuses and safety mechanism to the controller

  5. How A Microwave Oven Works When the controller says to go, the triac activates, sending power to the high voltage transformer (About 3000-4000 V)

  6. How A Microwave Oven Works • The magnetron tube transforms the high voltage into electromagnetic energy • A waveguide guides the microwaves into the cooking chamber • A stirring blade spreads the microwaves evenly

  7. High Voltage Components • The Magnetron is the heart of the microwave • 2450 MHz • Several components needed • 2450 MHz happened to be available • RF Leakage

  8. Normal Microwave Use • RF energy excites water molecules • Water molecules rotate on poles, friction with neighbor molecules • Friction forces molecules to retain energy, otherwise it would just radiate energy away

  9. CD in Microwave • RF energy bounces of from CD, makes neat sparks * This could cause damage to microwave

  10. Lit Matchstick in Microwave • Plasma of the fire rapidly absorbs the large amount of RF energy * This may damage your microwave

  11. Tinfoil in Microwave • This is why your mom told you to never put tinfoil in the microwave! • This kicks out a tremendous amount of heat and noise. Will burn through glass

  12. Light Bulbs in Microwave • A Christmas tree ornament works much like a CD, but in a 3-D Pattern • Gasses in light bulb make it glow different colors when subjected to microwave energy • A “burned out” bulb will work fine • A laser printer lamp • A small neon bulb works really well The setup At about 20sec

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