atmosphere_utils.py File Reference

Utilities for preparing atmosphere screens that can be called by users. Also contains a function for generating atmospheric transmission curves. More...

Functions
Tuple[float, float]	gateau.atmosphere_utils.prep_atm_ARIS_pool (Tuple[np.ndarray, int] args, str path_to_aris, float radius_tel, float sigma)
	Function that does the work of 'prep_atm_ARIS'. More...
None	gateau.atmosphere_utils.prep_atm_ARIS (str path_to_aris, float radius_tel, float edge_taper=-10, int num_threads=NCPU)
	Prepare ARIS atmospheric screens for usage in gateau. More...
np.ndarray	gateau.atmosphere_utils.get_eta_atm (np.ndarray f_src, float pwv0, float el0)
	Get atmospheric transmission curve for a range of frequencies. More...

Variables
	gateau.atmosphere_utils.NCPU = multiprocessing.cpu_count()

Detailed Description

Utilities for preparing atmosphere screens that can be called by users. Also contains a function for generating atmospheric transmission curves.

Function Documentation

get_eta_atm()

np.ndarray gateau.atmosphere_utils.get_eta_atm	(	np.ndarray	f_src,
		float	pwv0,
		float	el0
	)

Get atmospheric transmission curve for a range of frequencies.

Parameters

f_src	Array of frequencies at which to evaluate atmospheric transmission, in Hz.
pwv0	PWV at which to evaluate transmission, in mm.
el0	Elevation at which to evaluate transmission in degrees.

Returns

Array of atmospheric transmission values.

prep_atm_ARIS_pool()

Tuple[float, float] gateau.atmosphere_utils.prep_atm_ARIS_pool	(	Tuple[np.ndarray, int]	args,
		str	path_to_aris,
		float	radius_tel,
		float	sigma
	)

Function that does the work of 'prep_atm_ARIS'.

It is not supposed to be used as-is, but rather to be passed to 'multiprocessing.Pool'.

Parameters

args	Arguments over which parallelisation occurs. In this case, these are a list of ARIS screen names, and the thread index.
path_to_aris	Path to folder containing ARIS screens.
radius_tel	Radius of primary aperture of telescope, in meters.
sigma	Standard deviation of Gaussian power pattern of primary aperture.

Returns

Number of cells along x-direction, per screen.

Number of cells along y-direction, per screen.

Minimum PWV fluctuation for all screens.

Maximum PWV fluctuation for all screens.