Lattice Measurement
Detect and measure periodic lattice structures from ACF or FFT peak positions. Reports lattice vectors and angles. Equivalent to Gwyddion's measure_lattice.c module.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input field with periodic structure |
Outputs
| Name |
Type |
Description |
| correlation |
DATA_FIELD |
ACF or FFT magnitude used for detection |
| measurements |
RECORD_TABLE |
Detected lattice vectors, spacings, and angle |
Controls
| Name |
Type |
Default |
Description |
| method |
dropdown |
acf |
Detection method: acf (autocorrelation) or fft (Fourier transform) |
Notes
- ACF method finds the strongest off-center peaks in the 2D autocorrelation. Works well for real-space periodic structures.
- FFT method finds peaks in the power spectrum. Better for weak periodicity or noisy data.
- Reports up to two lattice vectors (a, b), their magnitudes, and the angle between them.
- For best results, the field should contain at least 3–4 complete periods in each direction.
