AnglesFromGratingEquation3D

class gwcs.spectroscopy.AnglesFromGratingEquation3D(groove_density, spectral_order, **kwargs)[source]

Bases: astropy.modeling.Model

Solve the 3D Grating Dispersion Law in Direction Cosine space for the refracted angle.

Parameters
groove_densityint

Grating ruling density in units of 1/m.

orderint

Spectral order.

Examples

>>> from astropy.modeling.models import math
>>> model = AnglesFromGratingEquation3D(groove_density=20000*1/u.m, spectral_order=-1)
>>> alpha_in = (math.Deg2radUfunc() | math.SinUfunc())(.0001 * u.deg)
>>> beta_in = (math.Deg2radUfunc() | math.SinUfunc())(.0001 * u.deg)
>>> lam = 2e-6 * u.m
>>> alpha_out, beta_out, gamma_out = model(lam, alpha_in, beta_in)
>>> print(alpha_out, beta_out, gamma_out)
0.04000174532925199 -1.7453292519934436e-06 0.9991996098716049

Attributes Summary

groove_density

Grating ruling density in units 1/ length.

input_units

This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or None if any units are accepted).

linear

n_inputs

n_outputs

param_names

spectral_order

Spectral order.

Methods Summary

__call__(*inputs[, model_set_axis, …])

Evaluate this model using the given input(s) and the parameter values that were specified when the model was instantiated.

evaluate(wavelength, alpha_in, beta_in, …)

Evaluate the model on some input variables.

Attributes Documentation

groove_density = Parameter('groove_density', value=1.0)

Grating ruling density in units 1/ length.

input_units
linear = False
n_inputs = 3
n_outputs = 3
param_names = ('groove_density', 'spectral_order')
spectral_order = Parameter('spectral_order', value=1.0)

Spectral order.

Methods Documentation

__call__(*inputs, model_set_axis=None, with_bounding_box=False, fill_value=nan, equivalencies=None, inputs_map=None, **new_inputs)

Evaluate this model using the given input(s) and the parameter values that were specified when the model was instantiated.

evaluate(wavelength, alpha_in, beta_in, groove_density, spectral_order)[source]

Evaluate the model on some input variables.