Dalsa Spyder2 S2-2x-04K40, User Manual

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45 Spyder2 4k User’s Manual
03-032-10195-04 DALSA
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5
CCD Handling
Instructions
5.1 Electrostatic Discharge and the CCD Sensor
Cameras contain charge-coupled device (CCD) image sensors, which are metal oxide
semiconductor (MOS) devices and are susceptible to damage from electrostatic discharge
(ESD).
Electrostatic charge introduced to the sensor window surface can induce charge buildup
on the underside of the window that cannot be readily dissipated by the dry nitrogen gas
in the sensor package cavity. When charge buildup occurs, surface-gated photodiodes
(SGPDs) may exhibit higher image lag. Some SGPD sensors, such as the sensor used in
the Spyder2 cameras, may also exhibit a highly non-uniform response when affected by
charge buildup, with some pixels displaying a much higher response when the sensor is
exposed to uniform illumination. The charge normally dissipates within 24 hours and the
sensor returns to normal operation.
WARNING:
Charge buildup will affect the camera’s flat-field correction calibration. To avoid an
erroneous calibration, ensure that you perform flat-field correction only after a charge buildup
has dissipated over 24 hours.
5.2 Protecting Against Dust, Oil and Scratches
The CCD window is part of the optical path and should be handled like other optical
components, with extreme care.
Dust can obscure pixels, producing dark patches on the sensor response. Dust is most
visible when the illumination is collimated. The dark patches shift position as the angle of
illumination changes. Dust is normally not visible when the sensor is positioned at the
exit port of an integrating sphere, where the illumination is diffuse.