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DS-24-0<strong>2M30</strong> and DS-25-0<strong>2M30</strong> <strong>User</strong>’s <strong>Manual</strong> 33<br />
Thermal Management & Dark Current<br />
For any CCD camera optimal performance is achieved by transferring heat away from the<br />
sensor. Keeping a sensor “cool” reduces the amount of dark current generated. Dark<br />
current is the leading contributor to FPN, PRNU, dark offset, random noise and other<br />
performance specifications, especially when a camera is significantly gained (i.e. +10db).<br />
Generally, dark current doubles for every 7°C increase in temperature at the sensor and<br />
increases linearly with integration time.<br />
The Pantera SA <strong>2M30</strong> has been optimized to transfer heat from the sensor to the front and<br />
base plates. Therefore, to reduce dark current, the front and base plates are the ideal<br />
places to mount heat sinks.<br />
Some suggestions for optimizing camera cooling are:<br />
• To minimize power dissipation, keep input voltage as low as possible in the<br />
permitted 11 to 25V range.<br />
• Always operate the camera with a lens adapter or lens. The lens transfers a significant<br />
amount of heat from the interior of the camera, effectively acting as a heat sink.<br />
• Clamping a metal plate to the base of the camera. Keep in mind that the thicker and<br />
wider the metal plate, the more effective the cooling.<br />
• Convection is an ideal method to minimize camera warm-up times and reduce dark<br />
current generation. Mount fans away from the camera to avoid vibration, and direct<br />
the airflow across the housing to decrease the temperature delta between ambient<br />
and bottom plate temperatures.<br />
DALSA also offers a custom Pantera SA <strong>2M30</strong> heat sink, which can be purchased as a<br />
non-standard accessory (contact DALSA for more information).<br />
4.2 Optical Interface<br />
Depending upon resolution the cameras can be ordered with different lens mounts. The<br />
following table provides this information.<br />
Lens Mounts<br />
All C-mount and F-mount adapters have the appropriate back focal distance for the lens<br />
type being used. Ensure that the image circle diameter of the lens to be used is as great as<br />
the length of the imaging region. The following table provides information regarding the<br />
lens mount used and the back focal distance. The M42 lens adapter originated from the<br />
high-end photography standard. Distances to its inner flat surface and the outer flat<br />
surface are provided.<br />
Table 12: Lens Mounts<br />
Mount Back Focal Distance (sensor die to adapter)<br />
C-Mount<br />
F-Mount<br />
M42<br />
17.52 ±0.30mm<br />
46.5 ±0.30mm<br />
6.56mm ±0.30mm—outer flat surface<br />
DALSA 03-32-10157-02
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