Spyder 3 Camera User's Manual GigE Dual Line - Frame Grabbers
Spyder 3 Camera User's Manual GigE Dual Line - Frame Grabbers Spyder 3 Camera User's Manual GigE Dual Line - Frame Grabbers
44 Spyder 3 GigE User Manual 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 IL-P4 and the IT- P4 used in the Spyder 3 GigE 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. 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 or wet cleaning is necessary. Oil is usually introduced during handling. Touching the surface of the window barehanded will leave oily residues. Using rubber fingercots and rubber gloves can prevent oil contamination. However, the friction between the rubber and the window may produce electrostatic charge that may damage the sensor. To avoid ESD damage and to avoid introducing oily residues, only hold the sensor from the edges of the ceramic package and avoid touching the sensor pins and the window. Scratches can be caused by improper handling, cleaning or storage of the sensor. Vacuum picking tools should not come in contact with the window surface. CCDs should not be stored in containers where they are not properly secured and can slide against the container. Scratches diffract incident illumination. When exposed to uniform illumination, a sensor with a scratched window will normally have brighter pixels adjacent to darker pixels. The location of these pixels changes with the angle of illumination. 03-032-10158-06 DALSA
Spyder 3 GigE User’s Manual 45 5.3 Cleaning the Sensor Window 1. Use compressed air to blow off loose particles. This step alone is usually sufficient to clean the sensor window. 2. If further cleaning is required, use a lens wiper moistened with alcohol or acetone. 3. We recommend using lint-free ESD-safe cloth wipers that do not contain particles that can scratch the window. The Anticon Gold 9”x 9” wiper made by Milliken is both ESD safe and suitable for class 100 environments. Another ESD acceptable wiper is the TX4025 from Texwipe. 4. An alternative to ESD-safe cloth wipers is Transplex swabs that have desirable ESD properties. There are several varieties available from Texwipe. Do not use regular cotton swabs, since these can introduce charge to the window surface. 5. Wipe the window carefully and slowly. 6. When cleaning long linear sensors, it may be easier to wipe along the width (i.e. as opposed to the length) of the sensor. DALSA 03-032-10158-06
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<strong>Spyder</strong> 3 <strong>GigE</strong> User’s <strong>Manual</strong><br />
45<br />
5.3 Cleaning the Sensor Window<br />
1. Use compressed air to blow off loose particles. This step alone is usually sufficient to<br />
clean the sensor window.<br />
2. If further cleaning is required, use a lens wiper moistened with alcohol or acetone.<br />
3. We recommend using lint-free ESD-safe cloth wipers that do not contain particles that<br />
can scratch the window. The Anticon Gold 9”x 9” wiper made by Milliken is both ESD<br />
safe and suitable for class 100 environments. Another ESD acceptable wiper is the<br />
TX4025 from Texwipe.<br />
4. An alternative to ESD-safe cloth wipers is Transplex swabs that have desirable ESD<br />
properties. There are several varieties available from Texwipe. Do not use regular<br />
cotton swabs, since these can introduce charge to the window surface.<br />
5. Wipe the window carefully and slowly.<br />
6. When cleaning long linear sensors, it may be easier to wipe along the width (i.e. as<br />
opposed to the length) of the sensor.<br />
DALSA 03-032-10158-06
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