Source code for panoptes.pocs.scheduler.observation.bias

"""Bias frame observation helper.

Constructs a zero-exposure (bias) observation block with configuration-driven
counts and set size, storing results under an images/bias subdirectory.
"""

import os

from astropy import units as u

from panoptes.utils.config.client import get_config

from panoptes.pocs.scheduler.field import Field
from panoptes.pocs.scheduler.observation.base import Observation




class BiasObservation(Observation):
    """Observation subclass for taking a set of bias frames."""

    def __init__(self, position, min_nexp=None, exp_set_size=None):
        # Use get_config to get config before initialising the class
        if min_nexp is None:
            min_nexp = get_config("calibs.bias.min_nexp", default=10)
        if exp_set_size is None:
            exp_set_size = get_config("calibs.bias.exp_set_size", default=min_nexp)

        # Create a bias field
        field = Field("Bias", position=position)
        super().__init__(
            field=field,
            exptime=0 * u.second,
            min_nexp=min_nexp,
            exp_set_size=exp_set_size,
            dark=True,
        )

        # Specify directory root for file storage
        self._directory = os.path.join(self._image_dir, "bias")

    def __str__(self):
        return "BiasObservation"