IEVref: | 103-09-05 | ID: | |

Language: | en | Status: Standard | |

Term: | power spectral density | ||

Synonym1: | power spectrum density | ||

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Definition: | for a quantity having a continuous spectrum and a finite mean power, limit, at any frequency, of the quotient of the power within a frequency band containing that frequency by the bandwidth when the bandwidth tends to zero Note 1 to entry: The instantaneous power of a quantity is by convention equal to the square of its instantaneous value. This square is proportional to a physical power if the considered quantity is a field quantity. Note 2 to entry: The power spectral density is the Fourier transform of the autocorrelation function. | ||

Publication date: | 2009-12 | ||

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Internal notes: | 2017-02-20: Editorial revisions in accordance with the information provided in C00020 (IEV 103) - evaluation. JGO | ||

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Note 1 to entry: The instantaneous power of a quantity is by convention equal to the square of its instantaneous value. This square is proportional to a physical power if the considered quantity is a field quantity.

Note 2 to entry: The power spectral density is the Fourier transform of the autocorrelation function.