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
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40<br />
<strong>Spyder</strong> 3 <strong>GigE</strong> User <strong>Manual</strong><br />
The focal point is the point at which the image of an infinitely distant object is brought to<br />
focus. The effective focal length (f′) is the distance from the second principal point to the<br />
second focal point. The back focal length (BFL) is the distance from the image side of the<br />
lens surface to the second focal point. The object distance (OD) is the distance from the first<br />
principal point to the object.<br />
Figure 19: Primary Points in a Lens System<br />
Magnification and Resolution<br />
The magnification of a lens is the ratio of the image size to the object size:<br />
m<br />
h ′ where m is the magnification, h’ is the image height<br />
=<br />
h (pixel size) and h is the object height (desired object<br />
resolution size).<br />
By similar triangles, the magnification is alternatively given by:<br />
f′<br />
m =<br />
OD<br />
These equations can be combined to give their most useful form:<br />
h′ f′<br />
=<br />
h OD<br />
This is the governing equation for many object and<br />
image plane parameters.<br />
Example: An acquisition system has a 512 x 512 element, 10m pixel pitch area scan<br />
camera, a lens with an effective focal length of 45mm, and requires that 100μm in the<br />
object space correspond to each pixel in the image sensor. Using the preceding equation,<br />
the object distance must be 450mm (0.450m).<br />
10μm<br />
45mm<br />
= OD = 450mm( 0. 450m)<br />
100μm<br />
OD<br />
4.3 Electrical Interface<br />
The <strong>Spyder</strong> 3 <strong>GigE</strong> cameras have been designed for EMC compliance. The test setup has<br />
been verified to the following EMC standards:<br />
• CISPR-11:2004<br />
• EN 55011:2003<br />
• EN 61326:2002<br />
To achieve EMC compliance, follow these specific guidelines:<br />
03-032-10158-06 DALSA