def test_dispersion_for_horizontally_aligned_trace(self, horizontal_trace):
spt = SpectralTrace(horizontal_trace)
disp, wave = spt.get_max_dispersion()
dx = np.abs(np.diff(horizontal_trace["x2"]))
dw = np.abs(np.diff(horizontal_trace["wavelength"]))
assert np.average(disp) == approx(np.average(dx / dw), rel=1e-5)
def test_mtc_one_pixel_apart_for_diagonal_traces(self, diagonal_trace):
pixel_size = 0.015
spt = SpectralTrace(diagonal_trace)
disp, wave = spt.get_max_dispersion()
wave_edges = spt.get_pixel_wavelength_edges(pixel_size) # wavelength edges
dist_between_mtc = np.average(disp) * np.average(np.diff(wave_edges))
assert dist_between_mtc == approx(pixel_size, rel=1e-5)
def test_monochromatic_trace_curves_are_one_pixel_apart(self, basic_trace):
pixel_size = 0.015
spt = SpectralTrace(basic_trace)
disp, wave = spt.get_max_dispersion()
wbedges = spt.get_pixel_wavelength_edges(pixel_size) # wavelength edges
dist_between_mtc = np.average(disp) * np.average(np.diff(wbedges))
assert dist_between_mtc == approx(pixel_size, rel=1e-5)
def test_dispersion_for_vertically_aligned_trace(self, basic_trace):
# ..todo: accuracy of get_max_dispersion should be tested in a trace_list_utils tests file
spt = SpectralTrace(basic_trace)
disp, wave = spt.get_max_dispersion()
# dispersion is calculated by distance [mm] / wavelength coverage [um]
dy = np.diff(basic_trace["y2"])
dw = np.diff(basic_trace["wavelength"])
assert np.average(disp) == approx(np.average(dy / dw), rel=1e-5)
assert len(disp) == len(wave)
assert all(np.diff(wave) > 0)