Dark current calibration procedures studies for the ... - Arnaud Chapon
Aug 30, 2012 - 1/18. Title: Dark current calibration procedures studies for the NISP instru- .... where the 1.8 factor is obtained by scaling the noise spectrum of a detector. ... fowler−N ideal behaviour real behaviour. For each simulated exposure, the set ..... 16x2. 4x8. 1x32. 8x4. 2x16. (UTR) number of exposures read mode.
Dark current calibration procedures studies for the NISP instrument
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Dark current calibration procedures studies for the NISP instrument
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A. Chapon J.C. Clemens A. Ealet F. Marmol G. Smadja
The presented document is Proprietary information of the Euclid Consortium. This document shall be used and disclosed by the receiving Party and its related entities (e.g. contractors and subcontractors) only for the purposes of fulfilling the receiving Party’s responsibilities under the Euclid Project and that the identified and marked technical data shall not be disclosed or retransferred to any other entity without prior written permission of the document preparer.
Dark current calibration procedures studies for the NISP instrument
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Contents 1 Introduction and goal
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2 Overview of readout mode definitions 2.1 Multiaccum, Up The Ramp and Fowler modes . . . . . . . . . . . . . . . . . . . . . .
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3 Noise simulation in an UTR mode 3.1 Simulation method . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Simulation results for simple UTR . . . . . . . . . . . . . . . . . . . 3.3 UTR Noise simulation results for typical detector noise . . . . . . . . 3.4 Number of 300s exposures for different dark currents and CDS noises
The presented document is Proprietary information of the Euclid Consortium. This document shall be used and disclosed by the receiving Party and its related entities (e.g. contractors and subcontractors) only for the purposes of fulfilling the receiving Party’s responsibilities under the Euclid Project and that the identified and marked technical data shall not be disclosed or retransferred to any other entity without prior written permission of the document preparer.
Dark current calibration procedures studies for the NISP instrument
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1.0 30/08/2012 3/18
This document explores different sets of on-board calibration procedures for the NISP dark current map measurement, based on possible implementations in the mission and identifies the corresponding calibration modes and the impact on the mission time. We derive advantages and drawbacks of the different solutions. This comparison will help for the preparation of the calibration and characterization plans of the detectors.
1
Introduction and goal
In this paper, we study what is the best strategy to correct and calibrate the dark current noise in the NISP science images. The required dark current correction must be performed to an accuracy of 0.4% for photometry and 7% for spectroscopy which is equivalent to a 0.5 e− and 1 e− calibration error for typical low flux in science images. Traditionally, long dark images are taken during the mission monthly using the same readout and exposure scheme than science images. The dark should be also long enough to not be dominated by the readout mode and required to have a closed shutter. A possibility to save calibration time is to take shorter dark images using slews of the satellite. Typically, slew will take 150 to 300s, a time significantly shorter than the spectroscopic exposure time, currently set to 560s. Then, as it is not a typical implementation, we have explored the impact of using short dark images for the spectroscopic mode on both readout mode and needed mission time.
2
Overview of readout mode definitions
The readout strategy for the NISP detector is based on particular readout modes: the photometry channel uses a Fowler-16 mode with typical exposure time below 100s and the spectroscopic mode use a multi-4×37 mode in 560s. In this section, we recall basic detector readout mode definitions. Table 1 recalls the definition of the terms that will be used throughout this document.
2.1
Multiaccum, Up The Ramp and Fowler modes
The NISP baseline readout mode is the so-called multiaccum scheme in which m frames are averaged in each of the n groups of an exposure. Figure 1 displays typical sampling modes. Each group is the result of averaging frames. The multi-m×n notation is used to designate a readout mode made with n groups, each containing m averaged frames. The time difference between frames is called dtf rame while the time difference between groups is set to dtgroup . The integration time is m × dtf rame higher than the exposition time and depends on the size of the group. In an UTR mode, integration time and the exposure time are quite identical. It will not be the case in a Fowler one or in a multiaccum where the number of frames per group m is large (m¿10). For this case, we use the integration time of 565s as a limitation. Then, the multiaccum parameters are set to satisfy the condition n×m
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