cameras filters / accessories resource guide
illumination liquid lens / specialty telecentric fixed focal length
microscopy /
objectives
Illumination Types (continued)
DIFFUSE AXIAL
Diffuse light in-line with the optics. Lens looks through a beamsplitter that is reflecting light
onto the object. Illumination is coaxial to imaging system.
PROS
• Shadow-Free
• Even Illumination
• Little Glare
Patterns that are projected onto the object. Typically, lasers project lines, spots, grids, or circles.
PROS
• Brings Out
Surface Features
CONS
• Lower Intensity
Through the
Internal
Beamsplitter
CONS
• Extremely Intense
Source
• Absorbed by Some
Colors
PRODUCTS
USED
• LED Axial
Illuminators
• Fiber Optic Diffuse
Axial Adapters
APPLICATION
Highly reflective
objects.
A type of directional illumination that makes use of polarized light to remove specularities
and hot spots.
These types of illumination will work with opaque objects, but what about translucent?
Light enters a transparent or translucent object through the edge perpendicular to the lens.
Object is lit from behind. Used to silhouette opaque objects or for imaging through transparent objects
172 +44 (0) 1904 788600 | Edmund Optics® targets PRODUCTS
USED
• Line Generating
Laser Diodes
• Fiber Optic Line
Light Guides
• LED Projectors
APPLICATION
Inspection of threedimensional
objects
for missing features.
Topography
measurements.
STRUCTURED LIGHT
PROS
• Even Illumination
• Minimal Glare
CONS
• Lower Intensity
Through the
Polarizer
PRODUCTS
USED
• Attachable
Polarization Filters
• Polarizer/Analyzers
APPLICATION
Measurements and
inspection of shiny
objects.
POLARIZED LIGHT
PROS
• High Contrast of
Internal & Surface
Details
• Enhances Scratches,
Cracks and Bubbles
CONS
• Poor Edge Contrast
• Not Useful for
Opaque Objects
PRODUCTS
USED
• Fiber Optic Attachment
• Line Light Guides
• Laser Line Generators
• LED Ring Lights
APPLICATION
Glass and plastic
inspection.
DARKFIELD
PROS
• High Contrast for
Edge Detection
CONS
• Eliminates Surface
Detail
PRODUCTS
USED
• Fiber Optic
Backlights
• LED Backlights
APPLICATION
Targets and test patterns,
edge detection,
measurement of
opaque objects and
sorting of translucent
colored objects.
BACKLIGHT