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
40 Spyder 3 GigE User Manual The focal point is the point at which the image of an infinitely distant object is brought to focus. The effective focal length (f′) is the distance from the second principal point to the second focal point. The back focal length (BFL) is the distance from the image side of the lens surface to the second focal point. The object distance (OD) is the distance from the first principal point to the object. Figure 19: Primary Points in a Lens System Magnification and Resolution The magnification of a lens is the ratio of the image size to the object size: m h ′ where m is the magnification, h’ is the image height = h (pixel size) and h is the object height (desired object resolution size). By similar triangles, the magnification is alternatively given by: f′ m = OD These equations can be combined to give their most useful form: h′ f′ = h OD This is the governing equation for many object and image plane parameters. Example: An acquisition system has a 512 x 512 element, 10m 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). 10μm 45mm = OD = 450mm( 0. 450m) 100μm OD 4.3 Electrical Interface The Spyder 3 GigE cameras have been designed for EMC compliance. The test setup has been verified to the following EMC standards: • CISPR-11:2004 • EN 55011:2003 • EN 61326:2002 To achieve EMC compliance, follow these specific guidelines: 03-032-10158-06 DALSA
Spyder 3 GigE User’s Manual 41 • Ensure that all cable shields have 360° electrical connection to the connector. • Fasten and secure all connectors. The EMC compliance is achieved with the use of shielded CAT5e or CAT6 Ethernet cables Shielded cable suppliers The following is a partial list of cable suppliers carrying cables that meet the compliance requirements: • http://www.systemax.com/divisions.htm • http://www.cablestogo.com • http://www.globalsources.com DALSA 03-032-10158-06
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<strong>Spyder</strong> 3 <strong>GigE</strong> User’s <strong>Manual</strong><br />
41<br />
• Ensure that all cable shields have 360° electrical connection to the connector.<br />
• Fasten and secure all connectors.<br />
The EMC compliance is achieved with the use of shielded CAT5e or CAT6 Ethernet<br />
cables<br />
Shielded cable suppliers<br />
The following is a partial list of cable suppliers carrying cables that meet the compliance<br />
requirements:<br />
• http://www.systemax.com/divisions.htm<br />
• http://www.cablestogo.com<br />
• http://www.globalsources.com<br />
DALSA 03-032-10158-06
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