Finding the transmission through a stack of materials

import numpy as np
import matplotlib.pyplot as plt

import astropy.units as u
from astropy.visualization import quantity_support
quantity_support()

from roentgen.absorption import Material

optical_path = Material('air', 2 * u.m) + Material('mylar', 5 * u.micron) + Material('Al', 5 * u.micron)

energy = u.Quantity(np.linspace(1, 100, 300), 'keV')

plt.plot(energy, optical_path.transmission(energy), label='Transmission')
plt.xlabel('Energy [' + str(energy.unit) + ']')
plt.ylabel('Response')
plt.ylim(0, 1)
plt.legend()
plt.show()

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