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The
human eye can see well over a wide range of lighting conditions,
but a machine vision system is not as capable. You must therefore
carefully light the part being inspected so that the machine vision
system can clearly 'see' them.
The
light must be regulated and constant so that the light changes seen
by the machine vision system are due to changes in the parts being
inspected and not changes in the light source.
You
will want to select lighting that 'amplifies' the elements of the
part that you want to inspect and 'attenuates' elements that you
don't want to inspect. In the left picture, poor lighting makes
it difficult to read the letters on this part. In the right picture,
the lighting has been selected to clearly show the lettering.
 
Images courtesy of NER / RVSI, Inc.
Proper
lighting makes inspection faster and more accurate. Poor lighting
is a major cause of failure in machine vision inspection systems.
In
general, the available or ambient light is poor lighting and will
not work. For example, the overhead lights in a factory can burn
out, dim or be blocked, and these changes might be interpreted as
part failures by the machine vision system.
Selecting
the proper lighting requires some knowledge and experience. Our
distributors and lighting vendors will be able to do an analysis
of the parts you want to inspect and recommend proper lighting.
Click
on links above to learn more
Recommended
Lighting
Vendors:
DALSA
IPD works with the following lighting vendors:.
Advanced
Illumination (www.advancedillumination.com)
24 Peavine Drive
Rochester, VT 05767
802.767.3830 x221
CCS
America (www.ccsamerica.com)
CCS America, Inc.
48 Weston St.
Waltham, MA 02453
781.899.2494
Metaphase
Technologies (www.metaphase-tech.com)
3580 Progress Drive
Bensalem, PA 19020
215.639.8699
Northeast
Robotics RVSI (www.nerlite.com)
15 Twin Bridge Rd.
Weare, NH 03281
603.529.2385 x35
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