Description of Application:
Inspection of plastic quart-sized motor oil bottles for streak defects. The goal of this application is to image the bottles clearly to determine if there are any streak defects.
Product Images
Top view of setup plastic bottle surface inspection
Inspection Setup:
Illumination: L300-850-W [300mm Linear Light 850nm IR – “Connect-A-Light”
Light @ same angle as bottle
Filter: BP850
(A) Lens Working Distance: 12″
(B) Light Working Distance: 7″
(C) Horizontal Field of View: 8″
Evaluation
Infrared lighting lends itself to be very useful when looking at different plastic applications. By lighting the bottle with an intense IR light the streaks show up. A good bottle appears very white almost washed out as a streaked bottle is much darker. The trick is to illuminate the bottle without creating too much hot spotting. In this application a linear light was used with good results. Increased results could be obtained by utilizing a high powered back light to create more even lighting.
Application Images
Clear Cup with chocolate. Raw image of a good bottle. 
Raw image of a streaked bottle 
Filtered image of the bottles above 
Filtered image of the bottles above 