WF/PC2 Cycle 6 Cal: Internal Flats

Details WF/PC2 Cycle 6 Cal: Internal Flats WF/PC2 Cycle 6 Cal: Internal Flats

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6907s&link_type=abstract

HST Proposal ID #6907

Computer Science

Hst Proposal Id #6907

Scientific paper

This proposal consists of two parts: i} an INTFLAT filter sweep and, ii} a series of exposure to test the linearity of the camera. i} The sweep is a complete set of internal flats cycling through both shutter blades and both gains. Signal to noise per pixel is estimated to be similar to the VISFLATs {0.6%} but the spatial and wavelength variations in the illumination pattern are much larger. However, the INTFLATs will provide a baseline comparison of INTFLAT vs VISFLAT, in the event of a cal-channel system failure and temporal variations in the flatfields at the 1% level. In addition, these images will provide a good measurement {better than 1%} of the stability of the gain ratios. ii} The linearity test portion is aimed at obtaining a series of INTFLAT with both gains and both shutters. Since the INTFLATs have significant spatial structure, any non linearity would appear as a non uniform ratio of INTFLATs with different exposure times. A set of exposures is also taken with gain 7, shutter B, and clocks=YES.

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