vircam_detector_noise
[Recipes]
- Name:
- vircam_detector_noise
- Purpose:
- Work out the read noise and gain of a detector
- Description:
- The input dome flat exposures and dark exposures are used to determine the read noise and gain of a detector. The method uses two exposures of each. The dome flats and the dark frames should be done with the same exposure times. A simple statistical method is used to work out the desired values. See section 2.4 of the VIRCAM Data Reduction Library Design document for further information.
- Language:
- C
- Parameters:
- thr (float): The rejection threshold in numbers of sigmas.
- ext (int): The image extension of the input files to be done on this run. If all of the extensions are to be processed, then this should be set to zero.
- Input File Types:
- The following list gives the file types that can appear in the SOF file. The word in bold is the DO category value.
- DARK_GAIN (required): A list of two raw dark images. If any more are found in the list, they will be ignored.
- FLAT_LAMP_GAIN (required): A list of two raw dome flat images. If any more are found in the list, they will be ignored.
- MASTER_BPM or MASTER_CONF (optional): A master bad pixel mask. If this is omitted then all pixels are assumed to be good.
- Output Products:
- The following list gives the output data products that are generated by this recipe.
- An output readnoise/gain file (READGAIN_TABLE). The exact content of the columns is described in chapter 5 of the DRLD.
- Output QC Parameters:
- READNOISE The readout noise of the detector in electrons
- GAIN The gain of the detector in electrons per ADU.
- Notes
- None.
- Fatal Error Conditions:
- NULL input frameset
- Input frameset headers incorrect meaning that RAW and CALIB frame can't be distinguished
- Insufficient dark or flat exposures
- Unable to save data products
- Non-Fatal Error Conditions:
- Missing bad pixel or confidence map. All pixels considered to be good during the stats phase.
- Conditions Leading To Dummy Products:
- Image extensions wouldn't load.
- The detector for the current image extension is flagged dead
- Unphysical statistical result
- Author:
- Jim Lewis, CASU
- Code Reference:
- vircam_detector_noise.c
Generated on Wed Apr 10 04:01:58 2013 for VIRCAM Pipeline by
1.5.1