Snell

class jwst.transforms.models.Snell(angle, kcoef, lcoef, tcoef, tref, pref, temperature, pressure, name=None)

Bases: astropy.modeling.core.Model

Apply transforms, including Snell law, through the NIRSpec prism.

Parameters

• angle (float) – Prism angle in deg.

• kcoef (list) – K coefficients in Sellmeir equation.

• lcoef (list) – L coefficients in Sellmeir equation.

• tcoef (list) – Thermal coefficients of glass.

• tref (float) – Refernce temperature in K.

• pref (float) – Refernce pressure in ATM.

• temperature (float) – System temperature during observation in K

• pressure (float) – System pressure during observation in ATM.

Attributes Summary

n_inputs	The number of inputs.
n_outputs	The number of outputs.
standard_broadcasting

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.
compute_refraction_index(lam, temp, tref, …)	Calculate and retrun the refraction index.
evaluate(lam, alpha_in, beta_in, zin)	Go through the prism

Attributes Documentation

n_inputs = 4

The number of inputs.

n_outputs = 3

The number of outputs.

standard_broadcasting = False

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.

static compute_refraction_index(lam, temp, tref, pref, pressure, kcoef, lcoef, tcoef)

Calculate and retrun the refraction index.

evaluate(lam, alpha_in, beta_in, zin)

Go through the prism