import esbo_etc as eetc
from esbo_etc.lib.logger import logger
from esbo_etc.lib.cache import cache
import logging as log
import astropy.units as u
[docs]class esbo_etc:
"""
Top level class of the exposure time calculator
"""
[docs] def __init__(self, config: str = "esbo-etc_defaults.xml", logging: int = log.WARNING, spin: bool = False):
"""
Initialize a new exposure time calculator (ETC)
Parameters
----------
config : str
Path to the configuration file
logging : int
Loglevel from package logging
spin : bool
Show a spinner during computations
"""
self.__config = config
self.__logging = logging
self.__spin = spin
self.conf = None
[docs] def run(self) -> u.Quantity:
"""
Returns
-------
res: Quantity
The result of the computation. Depending on the input parameters, this will be either a dimensionless
signal-to-noise ratio (SNR), an exposure time in seconds or a sensitivity in apparent magnitues.
"""
# Set up logging
logger.setLevel(log.WARNING if self.__logging is None else self.__logging)
if self.__spin:
logger.addHandler(eetc.SpinnerHandler())
# Parse Configuration
logger.info("Parsing configuration...", extra={"spinning": True})
self.conf = eetc.Configuration(self.__config).conf
# Set up components
logger.info("Setting up components...", extra={"spinning": True})
target_factory = eetc.TargetFactory(self.conf.common)
oc_factory = eetc.OpticalComponentFactory(self.conf.common)
sensor_factory = eetc.SensorFactory(self.conf.common)
parent = target_factory.create(self.conf.astroscene.target)
parent = oc_factory.fromConfigBatch(self.conf, parent)
detector = sensor_factory.create(self.conf.instrument.sensor, parent)
# Calculate results
res = None
if hasattr(self.conf.common, "exposure_time") and hasattr(self.conf.common, "snr"):
res = detector.getSensitivity(self.conf.common.exposure_time(), self.conf.common.snr(),
self.conf.astroscene.target.mag)
elif hasattr(self.conf.common, "exposure_time"):
res = detector.getSNR(self.conf.common.exposure_time())
elif hasattr(self.conf.common, "snr"):
res = detector.getExpTime(self.conf.common.snr())
cache.close()
return res