88 lines
3.7 KiB
Python
88 lines
3.7 KiB
Python
from esbo_etc.classes.optical_component.AOpticalComponent import AOpticalComponent
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from esbo_etc.classes.IRadiant import IRadiant
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from esbo_etc.classes.SpectralQty import SpectralQty
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from abc import abstractmethod
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import astropy.units as u
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from astropy.modeling.models import BlackBody
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from typing import Union, Callable
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class AHotOpticalComponent(AOpticalComponent):
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"""
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Abstract super class for an optical component with thermal emission
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"""
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@abstractmethod
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@u.quantity_input(wl_bins='length', temp=[u.Kelvin, u.Celsius], obstruction_temp=[u.Kelvin, u.Celsius])
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def __init__(self, parent: IRadiant, emissivity: Union[SpectralQty, int, float, str], temp: u.Quantity,
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obstruction: float = 0, obstructor_temp: u.Quantity = 0 * u.K, obstructor_emissivity: float = 1):
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"""
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Initialize a new optical component with thermal emission
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Parameters
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----------
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parent : IRadiant
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The parent element of the optical component from which the electromagnetic radiation is received.
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emissivity : Union[SpectralQty, int, float, str]
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The spectral emissivity coefficient for the optical surface.
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temp: Quantity in Kelvin / Celsius
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Temperature of the optical component
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obstruction : float
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The additional obstruction factor of the optical component. 0 means the component is not obstructed, 1
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denotes a completely obstructed component with therefore no incoming flux. It is important to note, that
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the obstruction factor reflects the obstruction of the optical component additionally to the obstruction
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factors of the prior elements in the beam.
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obstructor_temp : Quantity in Kelvin / Celsius
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Temperature of the obstructing component.
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obstructor_emissivity : float
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Emissivity of the obstructing component.
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"""
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# Initialize super class
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super().__init__(parent, obstruction=obstruction, obstructor_temp=obstructor_temp,
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obstructor_emissivity=obstructor_emissivity)
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if temp > 0 * u.K:
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# Create noise from black body model
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if isinstance(emissivity, SpectralQty):
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bb = self.__gb_factory(temp)
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self.__noise = SpectralQty(emissivity.wl, bb(emissivity.wl)) * emissivity
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elif isinstance(emissivity, str):
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em = SpectralQty.fromFile(emissivity, u.nm, u.dimensionless_unscaled)
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bb = self.__gb_factory(temp)
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self.__noise = SpectralQty(em.wl, bb(em.wl)) * em
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else:
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bb = self.__gb_factory(temp, emissivity)
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self.__noise = bb
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else:
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self.__noise = 0
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def _ownNoise(self) -> Union[SpectralQty, Callable[[u.Quantity], u.Quantity], int, float]:
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"""
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Calculate the noise created by the optical component
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Returns
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-------
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noise : Union[SpectralQty, Callable[[u.Quantity], u.Quantity], int, float]
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The noise created by the optical component
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"""
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return self.__noise
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@staticmethod
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@u.quantity_input(temp=[u.Kelvin, u.Celsius])
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def __gb_factory(temp: u.Quantity, em: Union[int, float] = 1):
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"""
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Factory for a grey body lambda-function.
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Parameters
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----------
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temp : Quantity in Kelvin / Celsius
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The temperature fo the grey body.
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em : Union[int, float]
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Emissivity of the the grey body
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Returns
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-------
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bb : Callable
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The lambda function for the grey body.
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"""
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bb = BlackBody(temperature=temp, scale=em * u.W / (u.m ** 2 * u.nm * u.sr))
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return lambda wl: bb(wl)
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