from .AOpticalComponent import AOpticalComponent
from ..IRadiant import IRadiant
import astropy.units as u
from astropy.modeling.models import BlackBody
from ..Entry import Entry
from typing import Union
[docs]class CosmicBackground(AOpticalComponent):
"""
This class models the spectral radiance of the cosmic background as black body radiator
"""
@u.quantity_input(temp=[u.Kelvin, u.Celsius])
def __init__(self, parent: IRadiant, temp: u.Quantity = 2.725 * u.K, emissivity: float = 1):
"""
Initialize a new black body point source
Parameters
----------
parent : IRadiant
The parent element of the optical component from which the electromagnetic radiation is received
temp : Quantity in Kelvin / Celsius
Temperature of the black body
emissivity : float
The spectral emissivity coefficient for the optical surface.
Returns
-------
"""
# Create black body model with given temperature
bb = BlackBody(temperature=temp, scale=1 * u.W / (u.m ** 2 * u.nm * u.sr))
# Initialize super class
super().__init__(parent, 1.0, lambda wl: bb(wl) * emissivity)
[docs] @staticmethod
def check_config(conf: Entry) -> Union[None, str]:
"""
Check the configuration for this class
Parameters
----------
conf : Entry
The configuration entry to be checked.
Returns
-------
mes : Union[None, str]
The error message of the check. This will be None if the check was successful.
"""
mes = conf.check_quantity("temp", u.K)
if mes is not None:
return mes
if hasattr(conf, "emissivity"):
mes = conf.check_float("emissivity")
if mes is not None:
return mes