lentil.radiometry.planck_radiance

lentil.radiometry.planck_radiance(wave, temp, waveunit='nm', valueunit='wlam')

Compute the Planck law spectral radiance from a blackbody radiator at the given temperature.

\[M_{\lambda}(T) = \frac{2hc^2}{\lambda^5 \exp \left(\frac{hc}{\lambda k T}\right)-1}\]

Parameters:

• wave (array_like or float) – Wavelength or array of wavelengths

• temp (float) – Blackbody temperature in K

• waveunit (str) – Wavelength units, as accepted by Unit(). Default is nm.

• valueunit (str) – Flux units, as accepted by Unit(). Default is wlam.

Returns:

Spectral radiance in valueunit sr^-1.

Return type:

ndarray