Quality Control and
Data Processing

HC PLOTS
bias level IMG readout mode
readout noise IMG readout mode
QC1 database (advanced users): browse | plot
bias level POL readout mode
readout noise POL readout mode
QC1 database (advanced users): browse | plot

The ZIMPOL optical CCDs are operated synchroneously in a special shift-and-add mode (see the User Manual and the pipeline user manual for details). ZIMPOL has two detectors (DET.CHIP.NAME= Callas and Bartoli), each one with 1156 x 2014 pixel. Raw frames come with two extensions, for each detector one fits cube. ZIMPOL detectors can be operated in one of the three modes (DET.READ.CURNAME) StandardImaging, SlowPolarimetry and FastPolarimetry. For technical reasons the minimum exposure time DIT=1.1sec for StandardImaging and FastPolarimetry and it is 10sec for SlowPolarimetry.

	ZIMPOL raw bias frames (one plane of the cube) in StandardImaging readmode. detector = Callas
	ZIMPOL raw bias frames (one plane of the cube) in StandardImaging readmode. detector = Bartoli

	ZIMPOL raw bias frames (one plane of the cube) in SlowPolarimetry readmode. detector = Callas
	ZIMPOL raw bias frames (one plane of the cube) in SlowPolarimetry readmode. detector = Bartoli

	ZIMPOL raw bias frames (one plane of the cube) in FastPolarimetry readmode. detector = Callas
	ZIMPOL raw bias frames (one plane of the cube) in FastPolarimetry readmode. detector = Bartoli

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
[derived from QC procedure]	sphere_zimpol_bias_img..qc_bias	bias level raw frame	HC		[docuSys coming]
[derived from QC procedure]	sphere_zimpol_bias_pol..qc_bias	bias level raw frame	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The bias level is trended for both chips (CAM1, CAM2 = Callas, Bartoli) and for all three read modes.

Scoring&thresholds ZIMPL Bias Level

The QC parameter is scored with thresholds of +- 2%.

History

2018-11: Since begin of operations BIAS fits headers reported DIT=0, although for technical reasons the real minimum possible DIT should is 10 or 1.1. The templates for DARK and FLAT have been fixed in 2018-11, the templates for BIAS have been fixed in 2019-01.

Algorithm ZIMPL Bias Level

The median of the first plane of the raw frame cube is used.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
[derived from QC procedure]	sphere_zimpol_bias_img..qc_ron	RON raw frame	HC		[docuSys coming]
[derived from QC procedure]	sphere_zimpol_bias_pol..qc_ron	RON raw frame	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The readout noise is trended for both chips (CAM1, CAM2 = Callas, Bartoli) and for all three read modes.

Scoring&thresholds ZIMPOL RON

The QC parameter is scored with an upper threshold of 4 ADU.

History

No remarks.

Algorithm ZIMPOL RON

The first five planes of the data cube are considered. For each pixel the standard deviation out of the five planes is calculated. The median of all stdev values between x=[300,850] and y=[100,900] is taken.