APPENDIX
iKon-L APPENDIX
Page 156
A1.1.2- Accumulation
Accumulation is the process by which data that have been acquired from a number of similar scans are added
together in computer memory. This results in improved signal to noise ratio.
An Acquisition is taken to be the complete data capture process.
Charge from the CCD is initially read as an analog signal, ranging from zero to the saturation value. A/D
conversion changes the analog signal to a binary number which can then be manipulated by the computer.
Background is a data acquisition made in darkness. It is made up of fixed pattern noise, and any signal due
to dark current.
A1.1.6 - Binning
Binning is a process that allows charge from two or more pixels to be combined on the CCD-chip prior to
readout (please refer to Readout Sequence of an CCD on page 155).
Summing charge on the CCD, and doing a single readout gives better noise performance than reading out
several pixels and then summing them in the computer memory. This is because each act of reading out
contributes to noise.
There are two main variants of the binning process:
• Vertical binning
• Horizontal binning
In addition there are several binning patterns that tailor the main binning variants to typical application usage.
To Next Page
Loading...
Need help?
General
