pybsm.radiance.functional.focal_plane_integrated_irradiance

pybsm.radiance.functional.focal_plane_integrated_irradiance(*, L: ndarray, L_s: float, t_opt: float, e_opt: float, lambda0: ndarray, d_lambda: float, optics_temperature: float, D: float, f: float) → ndarray

IBSM Equation 3-34.

Calculates band integrated irradiance at the focal plane, including at-aperture scene radiance, optical self-emission, and non-thermal stray radiance. NOTE: this function is only included for completeness. It is much better to use spectral quantities throughout the modeling process.

Parameters:

• L – band integrated at-aperture radiance (W/m^2 sr)

• L_s – band integrated stray radiance from sources other than self emission (W/m^2 sr)

• t_opt – full system in-band optical transmission (unitless); if the telescope is obscured, t_opt is further reduced by 1-eta**2, where eta is the relative linear obscuration

• e_opt – full system in-band optical emissivity (unitless); 1-t_opt is a good approximation

• lambda0 – wavelength at the center of the system bandpass (m)

• d_lambda – system spectral bandwidth (m)

• optics_temperature – temperature of the optics (K)

• D – effective aperture diameter (m)

• f – focal length (m)

Returns:

E:

integrated irradiance (W/m^2) at the focal plane