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词汇 Quality Factor
分类 英语词汇 英语翻译词典
释义

Quality Factor

英语百科

Q factor

The bandwidth Δf = f1 − f2 of a damped oscillator is shown on a graph of energy versus frequency. The Q factor of the damped oscillator, or filter, is fc/Δf. The higher the Q, the narrower and 'sharper' the peak is.

In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how under-damped an oscillator or resonator is, and characterizes a resonator's bandwidth relative to its center frequency. Higher Q indicates a lower rate of energy loss relative to the stored energy of the resonator; the oscillations die out more slowly. A pendulum suspended from a high-quality bearing, oscillating in air, has a high Q, while a pendulum immersed in oil has a low one. Resonators with high quality factors have low damping so that they ring longer.

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