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CALIBRATION PATTERNS: GRID PATTERNS FOR TC LENSES CALIBRATION

Any machine vision lens (either telecentric or not) shows some amount of distortion.
In addition to "barrel" or "pincushion" distortion, changes in the view angle or misaligned components will affect the image symmetry and generate the so called "thin prism" or "keystone" effect.
Imaging and metrology applications very often require to minimize distortion, which can be software corrected by analyzing the image of a precision pattern whose geometrical features are well known.
For this reason Opto Engineering offers chrome-on-glass patterns optimized for software calibration, featuring extremely high geometrical accuracy thanks to photolithography techniques.
The range of available chessboard patterns is compatible with most OE telecentric lenses.

 

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Part Number Compatible Compatible Dimensions Thickness Active Area Squares Dimensional Datasheet Get a
Quotation
Telecentric Lenses Pattern Mounts Width x Height Width x Height Width & Spacing Accuracy &
(Part Numbers ending in) (CMPH) (mm x mm) (mm) (mm x mm) (mm) (micron) Drawing
PT004-009 04, 07 and 09 CMPH004-024 33 x 26 3 15 x 13 0,2 1,29 PT004-009
PT016-024 16, 24 CMPH004-024 33 x 26 3 24 x 31 0,6 1,52 PT016-024
PT036-056 36, 48 and 56 CMPH036-056 66 x 52 3 51 x 64 1,35 1,9 PT036-056
PT064-096 64, 72, 80, 85 and 96 CMPH064-096 107 x 83 3 105 x 79 2,2 2,4 PT064-096
PT120-240 110, 120, 130, 144, 172, 192, 200, 240 n.a. 229 x 229 3 208 x 208 4 3,7 PT120-240

 

Software calibration is accurate if pattern placement is accurate too.
To do so, Opto Engineering offers specific pattern holders to easily and precisely mount each calibration pattern on its specific holding mechanics.
The pattern is assembled on a frame held by three magnets: this floating system allows for the adjustment of the pattern phase and for proper centering.

Part Number Compatible Width Height Thickness Weigh Datasheet Get a
Quotation
  Patterns       (g) &
    (mm) (mm) (mm) (mm) Drawing
 
CMPH004-024 PT004-009, PT016-024 45 68,5 18,0 78,0 CMPH004-024
CMPH036-056 PT036-056 81 123,1 22,5 257,0 CMPH036-056
CMPH064-096 PT064-096 129 145,5 25,0 611,0 CMPH064-096

 

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