AnglesFromGratingEquation3D¶

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

Bases: 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`	Names of the parameters that describe models of this type.
`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')¶

Names of the parameters that describe models of this type.

The parameters in this tuple are in the same order they should be passed in when initializing a model of a specific type. Some types of models, such as polynomial models, have a different number of parameters depending on some other property of the model, such as the degree.

When defining a custom model class the value of this attribute is automatically set by the Parameter attributes defined in the class body.

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.

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AnglesFromGratingEquation3D¶