A6 Clearing Dark Current - Dalsa Spyder 3 GigE SG-10-01k80-00-R User Manual

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A6 Clearing Dark Current

Gate Dark Current Clear
Image sensors accumulate dark current while they wait for a trigger signal. If the readout
is not triggered in a reasonable amount of time, then this dark current accumulation may
increase to an excessive amount. The result of this happening will be that the first row,
and possibly additional rows (frames), of the image will be corrupt.
The sensor used in the Spyder 3 GigE camera contains two sources of dark current that
will accumulate with time: 1) in the photo sensitive area, and 2) in the gates used to clock-
out the charge.
The gate dark current can account for approximately 20% of the total dark current
present. While the exposure control has direct control over the amount of dark current in
the photo sensitive area, it has no control over the charge accumulated in the gates. Even
with exposure control on, at low line rates, this gate charge can cause the camera to
saturate.
Using the
camera's behavior in order to minimize the dark current artifact.
The modes of operation selected by the
Note: This command is only available in low sensitivity and tall pixel modes. High
sensitivity mode operates only in the immediate read out position.
Dark Current
Figure 26: Gate Dark Current Clear
Table 16.
Model
SG-10-01K40-00-R
SG-10-01K80-00-R
SG-10-02K40-00-R
03-032-10158-09
Set Readout Mode (srm)
Clear
Dark
Mode
Current
Clear to
Immediate
Readout
Transition
Immediate
Frequency
Readout
Watchdog
0Hz
Frequency
Transition Frequencies
Dark Current Clear to
Immediate Readout
Transition
13.6KHz
25.1KHz
7.05KHz
command, the camera user can control the
command are: Auto, On, or Off.
srm
Immediate
Readout to
Dark
Current
Clear
Transition
Frequency
Increasing Line Rate
Frequency
Immediate Readout to
Dark Current Clear
Transition
16.4KHz
30.4KHz
8.52KHz
Spyder 3 GigE User Manual
Max. Line Rate in Max. Line Rate in
Dark Current Clear Immediate
Mode Readout Mode
DALSA