Power Spectrum

Use the 1D FFT > Power Spectrum menu option (FFTPSPEC GX) to calculate the logarithmic power spectrum of a channel and save it to a new database.

Log Power Spectrum dialog options

Channel

Name of the input channel in the current database.

Script Parameter: FFTPSPEC.IN

Power spectrum output channel

Name of the output channel containing the power spectrum, saved in a new database.

Script Parameter: FFTPSPEC.OUT

[Set Sampling]

Click this button to open the Set FFT Sampling Parameters dialog. Use it to configure the channel’s sampling parameters and ensure the input data is properly sampled for 1D FFT.

Application Notes

  • The output power spectrum represents the natural logarithm of the power spectrum.

  • The fiducial increment will be expressed in cycles per original fiducial.

  • The profile is extended to a power of 2 times the length, and the wavenumber increment will be calculated as: 1/(Length * Fiducial Increment).

See Also: