bb_cal_factor

sofia_redux.instruments.exes.makeflat.bb_cal_factor(wavenumber, bb_temp, flat_tamb, flat_emis)

Calibration factor for EXES blackbody source + flat mirror.

The EXES blackbody plate is located outside of the dewar, with one reflection off of a flat mirror before entering the EXES window. This flat field system seems to produce photons like the sum of two blackbodies:

B(BB_TEMP, lambda) * (1-emissivity) + emissivity * B(T_ambient),

where emissivity is (1-reflectance) of the flat mirror.

Expected values are emissivity = 0.1. (reflectance = 0.9) and T_ambient = 290 K.

Parameters:

wavenumberfloat or array-like of float

Wavenumber values for computing the black-body function.

bb_tempfloat

Blackbody source temperature value.

flat_tambfloat

Ambient temperature for flat mirror.

flat_emisfloat

Emissivity factor (1 - reflectance) for the flat mirror.

Returns: