power spectrum

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power spectrum

A plot of the power contained in a signal versus the frequency, or of the power in a spatial distribution versus the wavenumber (reciprocal of wavelength). It may be obtained by taking a Fourier transform of the signal or distribution and squaring the amplitude of each component in the result.

power spectrum

[′pau̇·ər ‚spek·trəm]
(physics)
References in periodicals archive ?
By semi-deterministic approaches we here refer to approaches that use a single power spectrum density (PSD) or single matrix of power spectra to approximate the original time history load of a particular vehicle.
Comparison of the Radiation Power Spectra and CIE Chromaticity Locations of Phosphor R-645 with Different Weight Concentrations.
Acceleration data were recorded at a sampling rate of 1 kHz using an analog-to-digital converter (Power Lab 16/35; AD Instruments, Aichi, Japan) (Figure 2(a)) and were analyzed using specialized software (Lab Chart 7; AD Instruments, Aichi, Japan) to calculate and sum the power spectra within 1-5 Hz for each axis on three dimensions (x-, y-, and z-axis) (Figure 2(b)).
In Section 3, we discuss the scalar and tensor power spectra and prove that the solution of Hubble parameter represents a saddle point.
To investigate the overall behavior of each channel, the temporal correlations of the texture and their power spectra are averaged over all range cells.
(1) At [r.sub.s] = 3.7 mm, a distributed point set with a ring structure appears on the Poincare map of wave generator, and the power spectra becomes discrete.
Power spectra can provide information about the excitability of EEG signals [31].