Cavity resonator
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A cavity resonator uses resonance to amplify a wave. The cavity has interior surfaces which reflect one type of wave. When a wave that is resonant with the cavity enters, it bounces back and forth within the cavity, with low loss (See standing wave). As more wave energy enters the cavity, it combines with and reinforces the standing wave, increasing its intensity.
Some common examples of cavity resonators include the klystron tube in a microwave oven (see also magnetron), the tube of a flute, and the body of a violin (this latter also being an example of a Helmholtz resonator). The calculation of the exact magnetic field has mathematical complexities and involves the study of Bessel functions.
In a laser, light is amplified in a cavity resonator which is usually composed of two or more mirrors. Thus an optical cavity, also known as a resonator, is a cavity with walls which reflect electromagnetic waves (light). This will allow standing wave modes to exist with little loss outside the cavity.
Patents
- Template:US patent -- High frequency tanks and resonant cavities -- S. A. Schelkunoff
- Template:US patent -- Cavity resonator -- H. Bushholz
- Template:US patent -- High frequency resonator and circuit therefor -- P. S. Carter
- Template:US patent -- Cavity resonator circuit -- P. S. Carter
- Template:US patent -- Ultra short wave radio system -- S. A. Schelkunoff
- Template:US patent -- Cavity resonator circuit -- P. S. Carter
- Template:US patent -- Inductance-capacitance resonance circuit -- H. B. Rex