radis.tools.fitting module¶

Fitting Tools embedded RADIS, for simple cases

For more advanced cases, use Fitroom : https://github.com/radis/fitroom

https://user-images.githubusercontent.com/16088743/120166810-4ac14980-c1fd-11eb-9dd5-8fb037db8793.mp4

Originally in radis-examples : https://github.com/radis/radis-examples

LTEModel(factory, fittable_parameters, fixed_parameters={}) → Spectrum[source]¶

A model returning a single-slab LTE spectrum

Parameters:

model_input (dict) – input dictionary (typically: temperatures). Example

{'Trot':value}

Returns:

Spectrum

Return type:

calculated spectrum

Examples

Legacy #1: Temperature fit of CO2 spectrum

Legacy vs recommended fitting examples

Tvib12Tvib3Trot_NonLTEModel(factory, fittable_parameters, fixed_parameters={}) → Spectrum[source]¶

A model returning a single-slab non-LTE spectrum with Tvib=(T12, T12, T3), Trot

Used for non-LTE CO2 modeling. See the multi-temperature fit example

Parameters:

fittable_parameters (dict) – input dictionary of fittable parameters (typically: temperatures). Example
```
{'T12':value,
 'T3':value,
 'Trot':value}
```
fixed_parameters (dict) – input dictionary of non-fittable parameters. Will override input conditions given to non_eq_spectrum()

Returns:

Spectrum

Return type:

calculated spectrum

Examples

Legacy #2: non-equilibrium CO2 (Tvib_12, Tvib_3, Trot)

See also

LTEModel(), residual_NonLTE()

fit_legacy(factory, s_exp, model, fit_parameters, bounds={}, fixed_parameters={}, plot=False, verbose=True, solver_options={'maxiter': 300}) → Spectrum | OptimizeResult[source]¶

Fit an experimental spectrum with an arbitrary model and an arbitrary number of fit parameters. This legacy function is replaced by fit_spectrum() but is still functional.

Parameters:

s_exp (Spectrum) – experimental spectrum. Should have only spectral array only. Use take(), e.g:
```
sf.fit_legacy(s_exp.take('transmittance'))
```
model (func -> Spectrum) – a line-of-sight model returning a Spectrum. Example : Tvib12Tvib3Trot_NonLTEModel()
fit_parameters (dict) –

example:
```
{fit_parameter:initial_value}s
```
bounds (dict, optional) –

example:
```
{fit_parameter:[min, max]}
```
fixed_parameters (dict) –

fixed parameters given to the model. Example:
```
fit_spectrum(fixed_parameters={"vib_distribution":"treanor"})
```

Other Parameters:

plot (bool) – if True, plot spectra as they are computed; and plot the convergence of the residual. Default False
verbose (bool, or 2) – use 2 for high verbose level.
solver_options (dict) – parameters forwarded to the solver. More info in minimize Example:
```
{"maxiter": (int)  max number of iteration default ``300``,
 }
```

Returns:

s_best (Spectrum) – best spectrum
res (OptimizeResults) – output of minimize

Examples

See a one-temperature fit example or a multi-temperature fit example.

More advanced tools for interactive fitting of multi-dimensional, multi-slabs spectra can be found in fitroom.

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radis.tools.fitting module¶