Telecentric lenses and optical systems for imaging, sensors, metrology, lighting and lasers.

Telecentric lenses and optical systems for imaging, sensors, metrology, lighting and lasers.

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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 angle of view or misalignment of component 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 featuring extremely high geometrical accuracy thanks to photolithography techniques.
The range of chessboard-style patterns offer an extensive coverage of most OE Telecentric Lenses FOVs, with geometrical features optimized for software calibration.

 

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Part Number Compatible Compatible Dimensions Thickness Active Area Squares Dimensional Datasheet Get a
Quotation
Telecentric Types Pattern Mounts Width x Height Width x Height Width & Spacing Accuracy &
(Matrix, Large and UV P/Ns 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 positioning is accurate too.
In order to ease the integration of Calibration Patterns, Opto Engineering also offers Pattern Holders. Each Calibration Pattern can be easily mounted on its specific holding mechanics.
The pattern is assembled on a plate which is held by three magnets: this floating system allows for the adjustment of the pattern phase and center position.
Patterns and pattern holders assembled with TC clamping mechanics offer a complete opto-mechanical solution for extremely accurate gauging systems using CVTClib calibration software library.

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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