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Date submitted: 5-Mar-2014
Long-term Variation of Diffuser Images
An opal glass diffuser was installed in the forward filter wheel (FWA) of
the SXT for use in recording CCD flat-field images on a routine basis.
However, the diffuser images were by no means "flat" and recorded visible
light artifacts not present in the x-ray images. Thus the diffuser images
were of limited use for their original purpose. However, they served a
useful purpose in recording the evolution of ionizing-radiation damage to
the CCD.
Mission-long variation of diffuser images (javascript movie).
The diffuser movie incorporates approximately 1 image per week throughout
the mission. Beginning 19-Jun-1999 only a quarter of the CCD image was
read out at full resolution because the half-resolution images became
saturated. Note that the smooth images with an L in the bottom line of
the label are 12 bit images. The images with a C are made from compressed
8 bit images.
LWA 3/5/2014
