Light Sources; Lens Modeling; Magnification And Resolution - Dalsa P-2 Series User Manual

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important than the rate at which it arrives. For example, 5µJ/cm
exposing 5mW/cm

Light Sources

Keep these guidelines in mind when setting up your light source.
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Filters
CCD cameras are extremely responsive to infrared (IR) wavelengths of light. To prevent
infrared from distorting the images you scan, use a "hot mirror" or IR cutoff filter that
transmits visible wavelengths but does not transmit wavelengths over 750nm. Examples
are the Schneider Optics™ B+W 489, which includes a mounting ring, the CORION™ LS-
750, which does not include a mounting ring, and the CORION™ HR-750 series hot
mirror.

Lens Modeling

Any lens surrounded by air can be modeled for camera purposes using three primary
points: the first and second principal points and the second focal point. The primary
points for a lens should be available from the lens data sheet or from the lens
manufacturer. Primed quantities denote characteristics of the image side of the lens. That
is, h is the object height and h
The focal point is the point at which the image of an infinitely distant object is brought to
focus. The effective focal length (f
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 11. 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:
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for 1ms just the same as exposing an intensity of 5W/cm
2
LED light sources are relatively inexpensive, provide a uniform field, and longer life
span compared to other light sources. However, they also require a camera with
excellent sensitivity, such as DALSA's Piranha2 camera.
Halogen light sources generally provide very little blue relative to IR.
Fiber-optic light distribution systems generally transmit very little blue relative to IR.
Some light sources age; over their life span they produce less light. This aging may
not be uniform—a light source may produce progressively less light in some areas of
the spectrum but not others.
'
is the image height.
'
) is the distance from the second principal point to the
Piranha2 User's Manual
can be achieved by
2
for 1µs.
2
DALSA