Parameters Indicated in English for Industrial Lenses in Machine Vision
WD:Work Distance
FOV:Field of View
DOV:Depth of Field
Ho:Height of field of view
Hi:Height of camera effective imaging area(Hi represents the size of the sensor image plane)
PMAG:Magnification of the lens
f:Focal length of the lens
LE:Extension distance of the lens image plane
Camera and Lens Selection Techniques
1.Main camera parameters:
Sensor Size(SS)
Main lens parameters:
Focal Length(FL)
Minimum object distance Dmin
2.Other parameters:
Field of View(FOV)
Pixel
FOVmin=SS×(Dmin/FL)
Example:SS=6.4mm,Dmin=8in,FL=12mm,pixel=640×480
Then:FOVmin=6.4×(8/12)=4.23mm,4.23/640=0.007mm
If accuracy requirement is 0.01mm,pixel resolution=0.007mm<0.01mm
Conclusion:The desired accuracy can be achieved.
VII.Industrial Camera Sensor Sizes:
1/4″:(3.2mm×2.4mm);
1/3″:(4.8mm×3.6mm);
1/2″:(6.4mm×4.8mm);
2/3″:(8.8mm×6.6mm);
1″:(12.8mm×9.6mm);
Optical Magnification
| Optical Magnification | Magnification of image size relative to object: β = y'/y |
|---|---|
| = b/a | |
| = NA/NA' | |
| = CCD sensor element size / actual field of view size | |
| Electronic Magnification | Electronic magnification is the magnification of the image captured by the camera on the CCD when displayed on the monitor |
| Monitor Magnification | Monitor magnification = magnification of the object (through the lens) displayed on the monitor |
| Monitor magnification = (Optical Magnification) × (Electronic Magnification) | |
| Example: Optical Magnification = 0.2X, CCD size = 1/2" (diagonal 8mm), monitor = 14" | |
| Electronic Magnification = 14 × 25.4 / 8 = 44.45 (times) | |
| Monitor magnification = 0.2 × 44.45 = 8.89 (times) (1 inch = 25.4mm) | |
| Field of View | Field of view is the size of the object area visible when the lens is connected to a CCD camera |
| Field of view size = (CCD format size) / (Optical Magnification) | |
| Example: Optical Magnification = 0.2X, CCD 1/2" (4.8mm height, 6.4mm width) | |
| Field of view size: height = 4.8 / 0.2 = 24 (mm) | |
| width = 6.4 / 0.2 = 32 (mm) |
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