BACKLIGHTS and MACHINE VISION LIGHTING
The lighting method producing a sharp, high contrast
silhouette of an object is known as backlighting. The
backlight itself is a sheet of white acrylic or frosted
glass plate evenly illuminated by a ribbon of fiber.
The two components are typically held in a housing,
with the fiber emitting light onto the back of the plate.
The plate diffuses and passes the light output.
During an inspection application, the camera exposure
is adjusted to record the illuminated plate, so any
object placed in front of the backlight appears dark,
and a silhouette is created.
Because light output is very diffused, backlights also
make good area frontlights for highly specular subjects
in some applications.
FTI manufactures
several
standard
products
for machine vision lighting
with the
following
features:
• Intense, uniform output, created by a proprietary
process to insure consistency and
optimal performance from part to part
• A standard bundle length of 36" (914mm)
is suitable for most applications
• Because FTI's bundle is made with glass, the
input can withstand heat
(and light energy) that could melt plastic
fiber products
• FTI Backlights can be used with all strobe lights
manufactured today
• Fixture holes in the all aluminum, black anodized
body assist in
mounting
• SS input adapter is swaged on the SS sheathing
for durability and
long life
• Housing thickness less than 1" (25mm).
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