Extracting and analyzing profiles

Besides areal (3D) parameters, surfalize can extract 2D profiles from a surface and compute profile roughness parameters from them.

from surfalize import Surface
from surfalize.examples import list_examples

surface = list_examples('.vk4')[0].load().level()
surface

Surface(94.40 x 70.79 µm²)

Horizontal, vertical and oblique profiles

Horizontal and vertical profiles are taken at a coordinate given in µm. An oblique profile runs between two points. Each returns a Profile object, which renders as a line plot.

profile = surface.get_horizontal_profile(35)  # y = 35 µm
profile

Profile(94.40 µm)

surface.get_vertical_profile(47)  # x = 47 µm

Profile(70.79 µm)

surface.get_oblique_profile(0, 0, 90, 70)

Profile(114.03 µm)

Profile roughness parameters

Profile exposes the standard profile parameters (Ra, Rq, Rz, Rsk, Rku) as well as the dominant spatial period.

print(f'Ra     = {profile.Ra():.3f} µm')
print(f'Rq     = {profile.Rq():.3f} µm')
print(f'Rz     = {profile.Rz():.3f} µm')
print(f'Period = {profile.period():.3f} µm')

Ra     = 0.653 µm
Rq     = 0.742 µm
Rz     = 2.782 µm
Period = 4.971 µm

Plotting a profile

plot_2d draws the extracted profile on a matplotlib axis.

profile.plot_2d();