28 lines
1.0 KiB
Markdown
28 lines
1.0 KiB
Markdown
# PSDF
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Compute the two-dimensional power spectral density function with Gwyddion-style window RMS compensation and centered zero frequency. Equivalent to psdf2d / gwy_data_field_2dpsdf.
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| field | DATA_FIELD | Yes | Input spatial-domain field |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| psdf | DATA_FIELD | 2D power spectral density, centered on DC |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| windowing | dropdown | hann | Window function applied before FFT to reduce spectral leakage: hann, hamming, blackman, or none |
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| level | dropdown | mean | Pre-processing: subtract mean, subtract plane, or none |
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## Limitations
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- Output is in the frequency domain; physical units on axes are spatial frequency (1/m) and PSDF units are z_unit²·m².
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- Window RMS compensation is applied to normalize the spectral density consistently across window choices.
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