ACQUIRING DATA
iKon-L SECTION 5
Page 59
5.4.5 - Cosmic Ray Removal
Cosmic rays are very high energy particles, originating in outer space, that enter the Earth’s atmosphere and
produce a shower of further high energy particles. When one of these particles passes through the CCD it will
produce between 0 and thousands of photoelectrons in a very small area (usually 1 to 4 pixels) and due to the
low read noise of the CCD this will appear as a spike of up to several hundred counts.
If the Cosmic Ray Removal option is selected, each scan will be compared with the previous one, for the
presence of unusual features. An example of a unusual feature is shown here:
If one is found, its pixel value will be replaced with a scaled version of the corresponding scan, e.g.:
NOTE: This option is only available if there are 2 or more scans to compare. It takes twice as long to
acquire one data set.
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