“power density(symbol: S)”的概念、定义、翻译、参考文献-科学参考

power density(symbol: S)

Electronics and Electrical Engineering

Of an electromagnetic wave, the power passing through unit area carried by the wave. If the electric and magnetic fields in the wave are E and H respectively (both vector quantities), then the power density is equal to the vector product of the fields:
$S = E \times H$
It is measured in watts per square metre. For a harmonic wave (with E and H both harmonic), a more often quoted value is the average power density, S_av, which is given by
$S_{av} = ½ ℛ (E \times H^{*})$
where $ℛ$ indicates the real rather than imaginary value, and H* is the complex conjugate of H.

单词	power density(symbol: S)
释义	power density(symbol: S) Electronics and Electrical Engineering Of an electromagnetic wave, the power passing through unit area carried by the wave. If the electric and magnetic fields in the wave are E and H respectively (both vector quantities), then the power density is equal to the vector product of the fields: $S = E \times H$ It is measured in watts per square metre. For a harmonic wave (with E and H both harmonic), a more often quoted value is the average power density, S_av, which is given by $S_{av} = ½ ℛ (E \times H^{})$ where $ℛ$ indicates the real rather than imaginary value, and H is the complex conjugate of H.
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