CCD Linearity and Shutter Stability

Details CCD Linearity and Shutter Stability CCD Linearity and Shutter Stability

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7666g&link_type=abstract

HST Proposal ID #7666

Computer Science

Hst Proposal Id #7666

Scientific paper

CCDs can suffer from non-linearities at low, high {or both} intensity. Such effects can be subtle, but important contributor to error budgets for routine science observations and are sometimes recognized only after limitations are detected in carefull analyses of science data. This proposal obtains data that directly explores for possible non-linearities at both low and high signal levels. Internal flats will be obtained with staggered exposure times and resulting count levels to provide a calibration of deferred chanrge, and these provide a sensitive means of detecting low-level traps. Imaging and spectral observations will be taken at both low and high count levels and with a range of exposure times and gain settings to explore for a full range of possible non-linearities, including a search for long versus short offsets as claimed for WFPC2. As a by product of the linearity tests this program will provide a precise meansurement of shutter-shading, the spatial dependence of exposure time due to finite travel time of the shutter, and a characterization of the random component in repeatability of exposure times.

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