ESBO-ETC/esbo_etc/classes/optical_component/AOpticalComponent.py

112 lines
4.3 KiB
Python

from ..ITransmissive import ITransmissive
from abc import abstractmethod
from ..SpectralQty import SpectralQty
from esbo_etc.lib.helpers import error
import astropy.units as u
from astropy.modeling.models import BlackBody
class AOpticalComponent(ITransmissive):
"""
Abstract super class for an optical component
"""
@abstractmethod
@u.quantity_input(obstructor_temp=[u.K, u.Celsius])
def __init__(self, parent: ITransmissive, transreflectivity: SpectralQty = None,
noise: SpectralQty = None, obstruction: float = 0, obstructor_temp: u.Quantity = 0 * u.K,
obstructor_emissivity: float = 0):
"""
Initialize a new optical component
Parameters
----------
parent : ITransmissive
The parent element of the optical component from which the electromagnetic radiation is received
transreflectivity : SpectralQty
The spectral transmission / reflectivity coefficient of the component. This coefficient is multiplied with
the incoming radiation from the parent element in order to propagate the incoming radiation through the
optical component.
noise : SpectralQty
The noise created by the optical component. This noise will be added to the propagated incoming noise in
order to calculate the overall noise.
obstruction : float
The additional obstruction factor of the optical component. 0 means the component is not obstructed, 1
denotes a completely obstructed component with therefore no incoming flux. It is important to note, that
the obstruction factor reflects the obstruction of the optical component additionally to the obstruction
factors of the prior elements in the beam.
obstructor_temp : Quantity in Kelvin / Celsius
Temperature of the obstructing component.
obstructor_emissivity : float
Emissivity of the obstructing component.
"""
self._parent = parent
if transreflectivity:
self._transreflectivity = transreflectivity
if noise:
self._noise = noise
self._obstruction = obstruction
self._obstructor_temp = obstructor_temp
self._obstructor_emissivity = obstructor_emissivity
def calcSignal(self) -> SpectralQty:
"""
Calculate the spectral flux density of the target's signal
Returns
-------
signal : SpectralQty
The spectral flux density of the target's signal
"""
return self.propagate(self._parent.calcSignal()) * (1 - self._obstruction)
def calcNoise(self) -> SpectralQty:
"""
Calculate the spectral radiance of the target's noise
Returns
-------
noise : SpectralQty
The spectral radiance of the target's noise
"""
parent = self.propagate(self._parent.calcNoise())
if self._obstructor_temp > 0 * u.K:
bb = BlackBody(temperature=self._obstructor_temp, scale=1. * u.W / (u.m ** 2 * u.nm * u.sr))
obstructor = bb(parent.wl) * self._obstructor_emissivity
return parent * (1. - self._obstruction) + obstructor * self._obstruction + self.ownNoise()
else:
return parent * (1. - self._obstruction) + self.ownNoise()
def propagate(self, sqty: SpectralQty) -> SpectralQty:
"""
Propagate incoming radiation through the optical component
Parameters
----------
sqty : SpectralQty
The incoming radiation
Returns
-------
sqty : SpectralQty
Manipulated incoming radiation
"""
if hasattr(self, "_transreflectivity"):
return sqty * self._transreflectivity
else:
error("Transreflectivity not given. Method propagate() needs to be implemented.")
def ownNoise(self) -> SpectralQty:
"""
Calculate the noise created by the optical component
Returns
-------
sqty : SpectralQty
The noise created by the optical component
"""
if hasattr(self, "_noise"):
return self._noise
else:
error("noise not given. Method ownNoise() needs to be implemented.")