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Calibir GXM640 IR Camera User's Manual
Technical Specifications
141
Sensor Handling Instructions
This section reviews proper procedures for handling, cleaning, or storing the Calibir
camera. Specifically the Calibir sensor needs to be kept clean and away from static
discharge to maintain design performance.
WARNING: Teledyne DALSA does not recommend removing the lens;
keeping the lens in place removes the possibilty of exposing the sensor to
contaminants that require cleaning (Calibir GXM640 cameras ship with lenses
attached).
If it is necessary to remove the lens:
Always keep the camera vertical, front plate facing down.
Do not touch the internal mechanical shutter; any physical contact to
the shutter may render it unusable.
Cleaning the Sensor Window
Dust can obscure pixels, producing dark patches on the sensor response. Dust can
normally be removed by blowing the window surface using a compressed air blower,
unless the dust particles are being held by an electrostatic charge, in which case either
an ionized air blower is necessary.
The sensor window is part of the optical path and should be handled like other optical
components, with extreme care. If the sensor window need cleaning:
Always keep the camera vertical, front plate facing down.
Ensure the shutter is in the open position.
Use compressed air (30psi maximum) to blow off loose particles. This step alone is
usually sufficient to clean the sensor window. Avoid moving or shaking the
compressed air container and use short bursts of air while moving the camera in the
air stream. Agitating the container will cause condensation to form in the air stream.
Long air bursts will chill the sensor window causing more condensation. Condensation,
even when left to dry naturally, will deposit more particles on the sensor.
WARNING: If using compressed air to clean sensor do not exceed 30psi or
damage may occur to the internal shutter.
Ensure the lens and interface thread are dust-free before replacing the lens.
Electrostatic Discharge and the Sensor
Cameras sensors containing integrated electronics 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 vacuum in the
sensor package cavity. With charge buildup, problems such as higher image lag or a
highly non-uniform response may occur. The charge normally dissipates within 24 hours
and the sensor returns to normal operation.
