Computer Science – Performance
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002wfc..rept....7r&link_type=abstract
Instrument Science Report WFC3-2002-07, 37 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
The goals of the WFC3 ground-based calibration effort are to perform a comprehensive instrument characterization to verify CEI performance, to understand the operational characteristics of the instrument, and to create calibration reference files that will serve as a baseline for on-orbit calibrations and data pipeline processing. The plan is based on the extensive experience and groundwork laid by the WFPC2, NICMOS, STIS and ACS instruments. As with ACS and WFPC2, this Calibration Plan emphasizes a suite of nine test categories. The suite of test categories includes a comprehensive characterization of all essential science performance parameters, and encompasses measurements conducted at component, subassembly and systems levels, and carried out in both ambient and thermal vacuum environments. Detailed test procedures will identify the desired WFC3 instrument configuration, the Optical Stimulus configuration, and the Exposure Time Calculator (ETC) estimates of exposure times for each of the measurements required. Our approach is to implement a "test as you build" approach. Given the schedule and budget constrained WFC3 program, this approach provides the opportunity to perform trouble shooting and noise debugging at the earliest possible opportunity, and to identify potential problems and implement solutions in a timely manner before launch. The overall integration and testing program makes use of facilities and Ground Support Equipment (GSE) at Ball, JPL and GSFC, using hardware and software tools developed for previous HST instruments. Using lessons learned from previous HST instruments, we plan to implement improvements in the data handling process to increase efficiency and assure data quality. This document addresses primarily those tests and calibration measurements that will be done at GSFC to ensure that WFC3 will be able to complete its scientific mission.
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