def test_doesnt_recalculate_when_psf_caches_mtf():
from prysm import Pupil, PSF
pu = Pupil()
ps = PSF.from_pupil(pu, 2)
mt = otf.MTF.from_psf(ps)
ps._mtf = mt
mt2 = otf.MTF.from_psf(ps)
assert id(mt) == id(mt2)
def test_diffprop_matches_airydisk(efl, epd, wvl):
fno = efl / epd
p = Pupil(wavelength=wvl, epd=epd)
psf = PSF.from_pupil(p, efl)
u, sx = psf.slice_x
u, sy = psf.slice_y
analytic = airydisk(u, fno, wvl)
assert np.allclose(sx, analytic, rtol=PRECISION, atol=PRECISION)
assert np.allclose(sy, analytic, rtol=PRECISION, atol=PRECISION)
def test_diffprop_matches_airydisk(efl, epd, wvl):
fno = efl / epd
p = Pupil(wavelength=wvl, epd=epd)
psf = PSF.from_pupil(p, efl, Q=3) # use Q=3 not Q=4 for improved accuracy
u, sx = psf.slice_x
u, sy = psf.slice_y
analytic = _airydisk(u, fno, wvl)
assert np.allclose(sx, analytic, atol=PRECISION)
assert np.allclose(sy, analytic, atol=PRECISION)
def test_diffprop_matches_airydisk(efl, epd, wvl):
fno = efl / epd
p = Pupil(dia=epd, xy_unit=u.mm, z_unit=u.nm, wavelength=mkwvl(wvl, u.um))
psf = PSF.from_pupil(p, efl, Q=3) # use Q=3 not Q=4 for improved accuracy
s = psf.slices()
u_, sx = s.x
u_, sy = s.y
analytic = airydisk(u_, fno, wvl)
assert np.allclose(sx, analytic, atol=PRECISION)
assert np.allclose(sy, analytic, atol=PRECISION)
def test_diffprop_matches_analyticmtf(efl, epd, wvl):
fno = efl / epd
p = Pupil(wavelength=wvl, epd=epd)
psf = PSF.from_pupil(p, efl)
mtf = MTF.from_psf(psf)
u, t = mtf.tan
uu, s = mtf.sag
analytic_1 = diffraction_limited_mtf(fno, wvl, frequencies=u)
analytic_2 = diffraction_limited_mtf(fno, wvl, frequencies=uu)
assert np.allclose(analytic_1, t, rtol=PRECISION, atol=PRECISION)
assert np.allclose(analytic_2, s, rtol=PRECISION, atol=PRECISION)
def test_diffprop_matches_analyticmtf(efl, epd, wvl):
fno = efl / epd
p = Pupil(dia=epd, xy_unit=u.mm, z_unit=u.nm, wavelength=mkwvl(wvl, u.um))
psf = PSF.from_pupil(p, efl)
mtf = MTF.from_psf(psf)
s = mtf.slices()
u_, x = s.x
u__, y = s.y
analytic_1 = diffraction_limited_mtf(fno, wvl, frequencies=u_)
analytic_2 = diffraction_limited_mtf(fno, wvl, frequencies=u__)
assert np.allclose(analytic_1, x, atol=PRECISION)
assert np.allclose(analytic_2, y, atol=PRECISION)
def test_array_orientation_consistency_tilt():
''' The pupil array should be shaped as arr[x,y], as should the psf and MTF.
A linear phase error in the pupil along y should cause a motion of the
PSF in y. Specifically, for a positive-signed phase, that should cause
a shift in the +y direction.
'''
samples = 128
p = Seidel(W111=1, samples=samples)
ps = PSF.from_pupil(p, 1)
idx_y, idx_x = np.unravel_index(ps.data.argmax(),
ps.data.shape) # row-major y, x
assert idx_x == ps.center_x
assert idx_y > ps.center_y
exit()
plt.style.use('bmh')
if 0:
dia = 10
fnos = [1, 4]
opds = [.4, .1]
mtfs = []
for fno, opd in zip(fnos, opds):
z = NollZernike(Z11=opd,
norm=True,
dia=dia,
opd_unit='um',
wavelength=0.1,
samples=1024)
ps = PSF.from_pupil(z, efl=dia * fno)
mt = MTF.from_psf(ps)
mtfs.append(mt.tan)
fig, ax = plt.subplots()
for curve, fno, opd in zip(mtfs, fnos, opds):
# each element in mtfs is a tuple of (frequency, MTF).
# * unpacks this and provides the x, y positional arguments to ax.plot
ax.plot(*curve, label=f'F/{fno}, opd={opd}')
ax.legend()
ax.set(xlim=(0, 120),
xlabel='Spatial Frequency [cy/mm]',
ylim=(0, 1),
ylabel='MTF [Rel. 1.0]')
plt.show()
def sample_psf_bigger():
p = Pupil()
return PSF.from_pupil(p, 20)
def sample_psf():
p = Pupil()
return PSF.from_pupil(p, 10)
