User`s manual

Preliminary
Genie Monochrome Series-GigE Vision Camera Technical Specifications • 97
Example: An acquisition system has a 512 x 512 element, 10μm pixel pitch area scan camera, a lens
with an effective focal length of 45mm, and requires that 100μm in the object space correspond to
each pixel in the image sensor. Using the preceding equation, the object distance must be 450mm
(0.450m).
OD
mm
m
m
45
100
10
=
μ
μ
)450.0(450 mmmOD =
Sensor Handling Instructions
This section reviews proper procedures for handling, cleaning, or storing the Genie camera.
Specifically the Genie CCD sensor needs to be kept clean and away from static discharge to maintain
design performance.
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 or a highly non-uniform response, 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.
Important: 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.
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.