A device that uses the resonance phenomenon to extract waves or vibrations of a specific frequency. It is generally called a resonator for sound. In electrical circuits, it is made by combining a coil and a capacitor, or a resistor and a capacitor. A resonator used to select specific frequencies from radio waves picked up by an antenna is called a tuning circuit. The higher the Q value, the stronger the ability to separate radio waves. Note that cavity resonators are used for microwaves, and optical resonators using interferometers are used for lasers. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
共振現象を利用して特定周波数の波や振動を取出すための装置。音に対しては一般に共鳴器という。電気回路ではコイルとコンデンサ,あるいは抵抗とコンデンサを組合せてつくる。アンテナでとらえた電波のなかから特定の周波数のものを選び出すために使う共振器を同調回路という。その Q値が高いほど電波を分離する能力が強い。なお,マイクロ波では空洞共振器,レーザーでは干渉計による光共振器が用いられる。
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