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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Reflection from film on substrate with background/noise
"""
import random
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import nm, deg
def get_sample():
# create materials
vacuum = ba.Vacuum()
ni_color = (0.93, 0.48, 0.14)
ni_mat = ba.SLDMaterial("Ni", ni_color, 9.4245e-06, 0)
substrate_color = (0.28, 0.57, 0.82)
substrate_mat = ba.SLDMaterial("SiSubstrate", substrate_color, 2.0704e-06, 0)
# create layers
ambient_layer = ba.Layer(vacuum)
ni_layer = ba.Layer(ni_mat, 7*nm)
substrate_layer = ba.Layer(substrate_mat)
# create sample
sample = ba.Sample()
sample.addLayer(ambient_layer)
sample.addLayer(ni_layer)
sample.addLayer(substrate_layer)
return sample
def get_simulation(sample, background):
n = 500
scan = ba.AlphaScan(n, 2*deg/n, 2*deg)
scan.setWavelength(0.154*nm)
scan.setIntensity(1e5)
simulation = ba.SpecularSimulation(scan, sample)
simulation.setBackground(background)
return simulation
def simulate(background, title):
sample = get_sample()
simulation = get_simulation(sample, background)
result = simulation.simulate()
result.setTitle(title)
return result
if __name__ == '__main__':
ba.showSample3D(get_sample(), sample_size=120*nm, seed=0)
# New seed each run; constant seed reproduces the same noise realization.
poisson_seed = random.randrange(2**32)
results = [
simulate(ba.ConstantBackground(2), "Constant background"),
simulate(ba.PoissonBackground(seed=poisson_seed), "Poisson noise"),
]
ba.plot_multicurve(results)
ba.plt.show()
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BornAgain
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≻ Documentation ≻ Examples ≻ Specular ≻ Instrument and resolution ≻ Background
