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Added Filippenko model, updated B&S refractivity
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@@ -8,3 +8,4 @@ from .refractionModels import *
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from .misc import *
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from .refractivityModels import *
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from .neoslalib import *
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from .observatories import *
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+113
-82
@@ -3,12 +3,93 @@ from .ciddorModel import Observatory
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from .refractionModels import refraction
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from .dispersionModels import dispersion
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from .neoslalib import sla_refro
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from .observatories import observatories
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from .refractivityModels import Edlen1953
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import numpy as np
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'''
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@ Author: Joost van den Born
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@ Contact: born@astron.nl
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@ Description: Some functions for quick testing.
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'''
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def get_conditions(location):
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'''
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Returns the mean conditions at various site. Currently
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supported locations:
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- 'STANDARD'
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- 'CERRO_ARMAZONES'
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- 'CERRO_PARANAL'
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- 'LA_PALMA'
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- 'LA_SILLA'
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- 'LAS_CAMPANAS'
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- 'MAUNA_KEA'
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Parameters
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----------
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location : string
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String denoting the desired location
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Returns
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-------
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observatory : dict
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Dictionary containing the atmospheric parameters
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'''
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observatory = observatories[location]
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return observatory
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def Filippenko1982(l1, l2, zenith, conditions='STANDARD', T=288.15, p=101325,
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RH=0.0, xc=450, lat=0, h=0, f=None):
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'''
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Calculates the refraction following the 1982 paper by
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Alexei V. Filippenko.
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The refraction is based on a flat atmosphere and the refractivity
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values are calculated from a modified Edlen (1953) equation.
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Parameters
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----------
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l1 : float
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Shortest wavelength of interest in micron.
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l2 : float
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Longest wavelength of interest in micron.
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zenith : float
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Angle of observation in degrees.
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zenith = 0 means the observation is directly overhead.
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conditions : string
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Refers to the standard conditions of the
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observatory. See get_conditions() for more info.
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If set to 'None', the conditions specified
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after will be used.
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T : float (optional)
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Temperature in Kelvin
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p : float (optional)
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Atmospheric pressure in Pa
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RH : float (optional)
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Relative humidity
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xc : float (optional)
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CO2 density in parts per million
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lat : float (optional)
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Latitude of the observer in degrees
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h : float (optional)
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Altitude of the observer in meters
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f : float
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Water vapour pressure (default=None). If None, it is
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calculated automatically.
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Returns
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-------
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R : float
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Atmospheric refraction in degrees
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'''
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if conditions is not None:
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T, p, RH, xc, lat, h, _ = get_conditions(conditions).values()
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n1 = Edlen1953(l1, T=T, p=p, RH=RH, f=f)
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n2 = Edlen1953(l2, T=T, p=p, RH=RH, f=f)
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dR = (n1 - n2) * np.tan(np.deg2rad(zenith))
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return np.degrees(dR)
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def quick_refractive_index(l, conditions='STANDARD', T=288.15, p=101325,
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@@ -23,8 +104,10 @@ def quick_refractive_index(l, conditions='STANDARD', T=288.15, p=101325,
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l : float
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Wavelength in microns
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conditions: string
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'STANDARD' or 'CERRO_ARMAZONES', refers
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to the standard atmospheric conditions.
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Refers to the standard conditions of the
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observatory. See get_conditions() for more info.
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If set to 'None', the conditions specified
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after will be used.
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T : float (optional)
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Temperature in Kelvin
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p : float (optional)
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@@ -43,23 +126,8 @@ def quick_refractive_index(l, conditions='STANDARD', T=288.15, p=101325,
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n : float
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Refractive index for the given conditions.
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'''
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if conditions == 'STANDARD':
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# Parameters at Cerro Armazones
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T = 288.15 # k
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p = 101325 # Pa
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RH = 0.0
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xc = 450 # ppm
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lat = 0 # degrees
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h = 0 # m
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elif conditions == 'CERRO_ARMAZONES':
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# Parameters at Cerro Armazones
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T = 279.65 # k
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p = 71200 # Pa
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RH = 0.22
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xc = 450 # ppm
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lat = -24.5983 # degrees
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h = 3064 # m
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if conditions is not None:
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T, p, RH, xc, lat, h, _ = get_conditions(conditions).values()
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# Initializing dispersion model
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at = Observatory()
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@@ -84,8 +152,10 @@ def quick_refraction(l, zenith, conditions='STANDARD', T=288.15, p=101325,
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Angle of observation in degrees.
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zenith = 0 means the observation is directly overhead.
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conditions : string
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'STANDARD' or 'CERRO_ARMAZONES', refers
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to the standard atmospheric conditions.
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Refers to the standard conditions of the
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observatory. See get_conditions() for more info.
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If set to 'None', the conditions specified
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after will be used.
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T : float (optional)
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Temperature in Kelvin
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p : float (optional)
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@@ -104,23 +174,8 @@ def quick_refraction(l, zenith, conditions='STANDARD', T=288.15, p=101325,
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R : float
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Refraction in degrees
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'''
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if conditions == 'STANDARD':
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# Parameters at Cerro Armazones
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T = 288.15 # k
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p = 101325 # Pa
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RH = 0.0
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xc = 450 # ppm
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lat = 0 # degrees
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h = 0 # m
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elif conditions == 'CERRO_ARMAZONES':
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# Parameters at Cerro Armazones
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T = 279.65 # k
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p = 71200 # Pa
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RH = 0.22
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xc = 450 # ppm
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lat = -24.5983 # degrees
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h = 3064 # m
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if conditions is not None:
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T, p, RH, xc, lat, h, _ = get_conditions(conditions).values()
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# Initializing dispersion model
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at = Observatory()
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@@ -154,8 +209,10 @@ def quick_dispersion(l1, l2, zenith, conditions='STANDARD', T=288.15,
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Angle of observation in degrees.
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zenith = 0 means the observation is directly overhead.
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conditions : string
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'STANDARD' or 'CERRO_ARMAZONES', refers
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to the standard atmospheric conditions.
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Refers to the standard conditions of the
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observatory. See get_conditions() for more info.
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If set to 'None', the conditions specified
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after will be used.
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T : float (optional)
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Temperature in Kelvin
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p : float (optional)
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@@ -174,23 +231,8 @@ def quick_dispersion(l1, l2, zenith, conditions='STANDARD', T=288.15,
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dR : float
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Atmospheric dispersion in degrees
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'''
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if conditions == 'STANDARD':
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# Parameters at Cerro Armazones
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T = 288.15 # k
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p = 101325 # Pa
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RH = 0.0
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xc = 450 # ppm
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lat = 0 # degrees
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h = 0 # m
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elif conditions == 'CERRO_ARMAZONES':
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# Parameters at Cerro Armazones
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T = 279.65 # k
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p = 71200 # Pa
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RH = 0.22
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xc = 450 # ppm
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lat = -24.5983 # degrees
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h = 3064 # m
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if conditions is not None:
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T, p, RH, xc, lat, h, _ = get_conditions(conditions).values()
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# Initializing dispersion model
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at = Observatory()
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@@ -228,8 +270,10 @@ def slalib_refraction(l, zenith, conditions='STANDARD', T=288.15, p=101325,
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Angle of observation in degrees.
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zenith = 0 means the observation is directly overhead.
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conditions : string
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'STANDARD' or 'CERRO_ARMAZONES', refers
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to the standard atmospheric conditions.
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Refers to the standard conditions of the
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observatory. See get_conditions() for more info.
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If set to 'None', the conditions specified
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after will be used.
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T : float (optional)
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Temperature in Kelvin
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p : float (optional)
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@@ -245,11 +289,11 @@ def slalib_refraction(l, zenith, conditions='STANDARD', T=288.15, p=101325,
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tlr : float
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Temperature lapse rate (default=0.0065)
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eps : float
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Precision at which the calculation is aborted (default=1e-10)
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Precision at which the calculation is aborted (default=1e-8)
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use_pyslalib : bool
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Flag that indicates that the user wants to use the pySlalib
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package. If False, the internal python port of the original
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FORTRAN code will be used. (Default=False).
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FORTRAN code will be used. (default=False).
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Returns
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-------
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@@ -257,23 +301,8 @@ def slalib_refraction(l, zenith, conditions='STANDARD', T=288.15, p=101325,
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Refraction in degrees
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'''
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if conditions == 'STANDARD':
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# Parameters at Cerro Armazones
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T = 288.15 # k
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p = 101325 # Pa
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RH = 0.0
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xc = 450 # ppm
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lat = 0 # degrees
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h = 0 # m
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elif conditions == 'CERRO_ARMAZONES':
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# Parameters at Cerro Armazones
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T = 279.65 # k
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p = 71200 # Pa
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RH = 0.22
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xc = 450 # ppm
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lat = -24.5983 # degrees
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h = 3064 # m
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if conditions is not None:
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T, p, RH, xc, lat, h, _ = get_conditions(conditions).values()
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# Converting units to the units that sla_refro() requires.
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_zenith = np.deg2rad(zenith) # From degrees to radians
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@@ -326,8 +355,10 @@ def slalib_dispersion(l1, l2, zenith, conditions='STANDARD', T=288.15, p=101325,
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Angle of observation in degrees.
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zenith = 0 means the observation is directly overhead.
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conditions : string
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'STANDARD' or 'CERRO_ARMAZONES', refers
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to the standard atmospheric conditions.
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Refers to the standard conditions of the
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observatory. See get_conditions() for more info.
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If set to 'None', the conditions specified
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after will be used.
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T : float (optional)
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Temperature in Kelvin
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p : float (optional)
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@@ -343,11 +374,11 @@ def slalib_dispersion(l1, l2, zenith, conditions='STANDARD', T=288.15, p=101325,
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tlr : float
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Temperature lapse rate (default=0.0065)
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eps : float
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Precision at which the calculation is aborted (default=1e-10)
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Precision at which the calculation is aborted (default=1e-8)
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use_pyslalib : bool
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Flag that indicates that the user wants to use the pySlalib
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package. If False, the internal python port of the original
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FORTRAN code will be used. (Default=False).
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FORTRAN code will be used. (default=False).
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Returns
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-------
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@@ -0,0 +1,85 @@
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observatories = {
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'STANDARD': {
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'T': 288.15,
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'p': 101325,
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'RH': 0.0,
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'xc': 450,
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'latitude': 0,
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'altitude': 0,
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'comment': 'Standard atmospheric conditions'
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},
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'CERRO_ARMAZONES': {
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'T': 279.65,
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'p': 71200,
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'RH': 0.22,
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'xc': 450,
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'latitude': -24.5983,
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'altitude': 3064,
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'comment': 'Default conditions for Cerro Armazones, site of the ELT.\nValues are taken from the optical model of MICADO.'
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},
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'CERRO_PARANAL': {
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'T': 285.95,
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'p': 74300,
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'RH': 0.15,
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'xc': 450,
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'latitude': -24.6230,
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'altitude': 2635,
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'comment': 'Average conditions at Cerro Paranal, site of the VLT.\nValues are taken from https://www.eso.org/sci/facilities/paranal/astroclimate/site.html and https://academic.oup.com/mnras/article/399/2/783/1061377'
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},
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'LA_SILLA': {
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'T': 284.65,
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'p': 77220,
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'RH': 0.44,
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'xc': 450,
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'latitude': -29.25,
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'altitude': 2400,
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'comment': 'Average conditions of the La Silla Observatory.\nValues based on https://www.eso.org/gen-fac/pubs/astclim/lasilla/diffrefr.html'
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},
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'LAS_CAMPANAS': {
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'T': 285.85,
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'p': 76400,
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'RH': 0.0,
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'xc': 450,
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'latitude': -29.016,
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'altitude': 2380,
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'comment': 'Mean conditions at Las Campanas observatory, site of the GMT.\nValues based on https://www.gmto.org/Resources/GMT-ID-01466-Chapter_5_Site_Evaluation.pdf and http://weather.lco.cl/'
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},
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'LA_PALMA': {
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'T': 281.95,
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'p': 77500,
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'RH': 0.36,
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'xc': 450,
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'latitude': 28.764,
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'altitude': 2396,
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'comment': 'Average conditions for Roque de los Muchachos Observatory on La Palma, Spain.\nValues taken from https://academic.oup.com/mnras/article/399/2/783/1061377'
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},
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'MAUNA_KEA': {
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'T': 274.45,
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'p': 61400,
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'RH': 0.48,
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'xc': 450,
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'latitude': 19.826,
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'altitude': 4205,
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'comment': 'Average conditions at the Mauna Kea Observatory.\nValues taken from http://www.soest.hawaii.edu/MET/Faculty/businger/mauna_kea/daSilvaThesisFinal.pdf, Ch. 3. and https://www.eso.org/gen-fac/pubs/astclim/espas/espas_reports/ESPAS-MaunaKea.pdf'
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}
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# 'MT_GRAHAM': {
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# 'T': 278.15,
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# 'p': 68500,
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# 'RH': 0.0,
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# 'xc': 450,
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# 'latitude': 32.701,
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# 'altitude': 3191,
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# 'comment': 'Mean conditions at Mount Graham International Observatory,\
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# site of the LBT. Values are estimates.'
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# },
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# 'FRED_LAWRENCE_WHIPPLE': {
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# 'T': 288.15,
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# 'p': 74300,
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# 'RH': 0.0,
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# 'xc': 450,
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# 'latitude': 31.681,
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# 'altitude': 2616,
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# 'comment': 'Mean conditions at Fred Lawrence Whipple Observatory, site of\
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# the MMT. Values are estimates.'
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# }
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}
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@@ -9,7 +9,7 @@ import numpy as np
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atmospheric dispersion, given a set of conditions.
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'''
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def BarrellAndSears(l, T=288.15, p=101325, RH=0):
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def BarrellAndSears(l, T=288.15, p=101325, RH=0, f=None):
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'''
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From Barrell & Sears, 1939
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Equation 7.7, page 52
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@@ -26,15 +26,20 @@ def BarrellAndSears(l, T=288.15, p=101325, RH=0):
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Atmospheric pressure in Pascal
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RH : float
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Relative humidity (0=<H=<1)
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f : float
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Water vapour pressure in Pascal
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Returns
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-------
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n : float
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Refractive index of atmospheric air at the given conditions
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'''
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if f is None:
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f = RH * svp(T)
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f_mmHg = hPA2mmHg(f/100)
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T = K2C(T)
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P = hPA2mmHg(p/100)
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R = (0.378125 + 0.0021414 / l**2 + 0.00001793 / l**4) * (P*(1 + (1.049 - 0.0157*T) * P * 1e-6)/(1 + 0.003661*T)) - (0.0624 - 0.000680 / l**2) * RH / (1 + 0.003661*T)
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R = (0.378125 + 0.0021414 / l**2 + 0.00001793 / l**4) * (P*(1 + (1.049 - 0.0157*T) * P * 1e-6)/(1 + 0.003661*T)) - (0.0624 - 0.000680 / l**2) * f_mmHg / (1 + 0.003661*T)
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n = R/1e6 + 1
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return n
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@@ -64,17 +69,25 @@ def Ciddor(l, CO2=450):
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return n
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def Edlen1953(l):
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def Edlen1953(l, T=288.15, p=101325, RH=0, f=None):
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'''
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From Edlen, 1953
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Equation 2
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At standard conditions only
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At standard conditions only.
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Following Filippenko (1982), eqs. 2 & 3 we also include
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the modification proposed by Barrell in 1951.
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Parameters
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----------
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l : float
|
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Wavelength in microns
|
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T : float
|
||||
Temperature in Kelvin
|
||||
p : float
|
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Atmospheric pressure in Pascal
|
||||
f : float
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||||
Water vapor pressure in Pascal
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Returns
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-------
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@@ -83,7 +96,20 @@ def Edlen1953(l):
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'''
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s = 1 / l
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R = 6432.8 + 2949810 / (146 - s**2) + 25540/(41-s**2)
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n = R/1e8 + 1
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n_standard = R/1e8 + 1
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pHg = hPA2mmHg(p/100)
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Tc = K2C(T)
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if f is None:
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f = RH * svp(T)
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f_mmHg = hPA2mmHg(f/100)
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||||
|
||||
# Changes in temperature and pressure, from Barrell (1951)
|
||||
n_tp = R/1e8 * (pHg * (1 + (1.049 - 0.0157*Tc) * 1e-6 * pHg ) ) / ( 720.883 * (1 + 0.003661 * Tc)) + 1
|
||||
|
||||
# Correction for water vapour pressure
|
||||
n_svp = (n_tp - 1) * 1e6 - ( 0.0624 - 0.000680 * s**2 ) / (1 + 0.003661 * Tc) * f_mmHg
|
||||
n = n_svp/1e6 + 1
|
||||
return n
|
||||
|
||||
|
||||
@@ -481,6 +507,7 @@ def Mathar(l, T=288.15, p=101325, RH=0):
|
||||
return n
|
||||
|
||||
|
||||
# Other necessary conversion or calculations
|
||||
def K2C(K):
|
||||
'''
|
||||
Kelvin to Celsius conversion
|
||||
@@ -514,3 +541,23 @@ def hPA2mmHg(hPa):
|
||||
'''
|
||||
return 0.7500616827 * hPa
|
||||
|
||||
|
||||
def svp(T):
|
||||
'''
|
||||
Saturation vapour pressure in Pa.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
T : float
|
||||
Atmospheric temperature in Kelvin
|
||||
|
||||
Returns
|
||||
-------
|
||||
svp : float
|
||||
Saturation vapour pressure in Pa
|
||||
'''
|
||||
_A = 1.2378847e-5 # K^-2
|
||||
_B = -1.9121316e-2 # K^-2
|
||||
_C = 33.93711047
|
||||
_D = -6.3431645e3 # K^-2
|
||||
return np.exp(_A*T**2 + _B*T + _C + _D/T)
|
||||
Reference in new issue
Block a user