DRS-ROP Pipeline¶

The DRS_ROP Pipeline works on detector level readouts. The current steps implemented in the pipeline are - Non-linearity Correction - Detector Readout Sampling

Non-linearity Correction¶

Non-linearity correction step corrects for the non-linear response of the detector to incoming flux. This step is executed before sampling algorithms.

Detector Readout Sampling¶

The H4RG detecors are readout in non-destructive reads and sampling algorithms are used to estimate the accumulated electrons in the detector for an integration time. The sampling algorithms currently implemented in the pipeline are - Correlated Double Sampling - Multi Correlated Double Sampling - Up-the-Ramp Sampling

Requirements¶

The sampling algorithms use the drsrop_clib module. https://github.com/oirlab/iris_readout

Running the Examples¶

There is a example run in the liger_iris_pipeline/readout/tests directory. The sample ramp is given in the sample_ramp.fits. sampling.cfg gives the configurations for the pipeline

sampling.cfg:

name = "rop"
class = "liger_iris_pipeline.pipeline.ROPPipeline"
save_results = True
    [steps]
      [[nonlincorr]]
      [[readoutsamp]]
       mode='mcds'

The sampling mode is set by the mode keyword which can be mcds or utr. MCDS algorithm also requires the group number, the number of reads to be co-added. This is currently hardcoded in this version.

Execute the pipeline from the command line¶

We can use strun from a terminal to execute the pipeline:

tmtrun sampling.cfg sample_ramp.fits

here is the output log:

2019-04-26 10:09:21,309 - stpipe.rop - INFO - ROPPipeline instance created.
2019-04-26 10:09:21,310 - stpipe.rop.nonlincorr - INFO - NonlincorrStep instance created.
2019-04-26 10:09:21,311 - stpipe.rop.readoutsamp - INFO - ReadoutsampStep instance created.
2019-04-26 10:09:21,311 - stpipe - INFO - Hostname: arun-ThinkPad-X1-Carbon-6th
2019-04-26 10:09:21,311 - stpipe - INFO - OS: Linux
2019-04-26 10:09:21,335 - stpipe.rop - INFO - Step rop running with args ('sample_ramp.fits',).
2019-04-26 10:09:21,335 - stpipe.rop - INFO - Starting ROP Pipeline ...
2019-04-26 10:09:21,499 - stpipe.rop.nonlincorr - INFO - Step nonlincorr running with args (<RampModel(1, 4, 10, 10) from sample_ramp.fits>,).
2019-04-26 10:09:21,577 - stpipe.rop.nonlincorr - INFO - Step nonlincorr done
2019-04-26 10:09:21,603 - stpipe.rop.readoutsamp - INFO - Step readoutsamp running with args (<RampModel(1, 4, 10, 10) from sample_ramp.fits>,).
2019-04-26 10:09:21,618 - stpipe.rop.readoutsamp - INFO - MCDS Sampling Selected
(10, 10)
2019-04-26 10:09:21,640 - stpipe.rop.readoutsamp - INFO - Step readoutsamp done
2019-04-26 10:09:21,665 - stpipe.rop - INFO - Saved model in sample_rop.fits
2019-04-26 10:09:21,665 - stpipe.rop - INFO - Step rop done

This creates a sample_rop.fits file in the working directory that is the processed

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