tono/docs/nodes/FFT 1D.md

FFT 1D

Compute the FFT amplitude spectrum of a line profile and identify the dominant period. The output x-axis is period (not frequency), sorted from short to long.

Inputs

Name	Type	Required	Description
profile	LINE	Yes	Input line profile

Outputs

Name	Type	Description
frequency_plot	LINE	FFT amplitude spectrum vs. period
max	RECORD_TABLE	Table with the peak period

Controls

None.

Limitations

• The DC component is excluded from the output.
• Spectrum is one-sided (real FFT); the x-axis shows period, not frequency.
• No windowing is applied; spectral leakage may affect results on non-periodic inputs.