Computer Science – Performance
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996wfpc.rept....1s&link_type=abstract
Instrument Science Report WFPC2 96-01
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2
Scientific paper
The study of internal WFPC2 flat fields and their temporal behaviour allows for the monitoring of a number of instrumental features, including ADC performance, stability of gain ratios, and flat fielding stability.
The aim of this report is to give an overview of the monitoring of these various aspects. Most of the results presented are derived from two cycle 5 calibration proposals (ID 6189 and 6190), although we have also made use of frames from cycle 4 proposals (ID 5561, 5655, 5764).
The visible cal-channel calibration system (VISFLAT mode) is based upon two Carley bulbs operating at about 2060 K and one Welch Allyn bulb operating at 2550 K. The Carley bulbs were used previously in WF/PC and have been reliable. Since less was known about the reliability of the Welch Allyn (hereafter WA) bulbs, a back up bulb was provided. The backup bulb is not currently in use but it is activated in the event the primary bulb fails. In order to obtain the desired flat and smooth spectrum, the light from these lamps was filtered through a combination of BG 38 and BG 24 glass windows. A different set of bulbs of the Carley type are also used for illuminating the shutter blades and obtaininig INTFLAT's.
We will address the results obtained from VISFLAT's and INTFLAT's separately.
Baggett Sylvia
Stiavelli Massimo
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