Industrial Lenses for Machine Vision
Lens selection controls resolution, distortion, depth of field, field of view, and measurement repeatability. The correct lens depends on sensor size, working distance, feature size, aperture, lighting geometry, and the tolerance of the inspection task.
Lens families
- Telecentric lenses for dimensional measurement
- Fixed focal length lenses for general area-scan inspection
- Macro lenses for small features and close working distances
- Line-scan lenses for wide moving targets
Selection inputs
- Sensor size and pixel size
- Field of view and working distance
- Required measurement tolerance
- Depth of field and aperture constraints
- Wavelength, SWIR transmission, and filter requirements
Failure modes
- Insufficient resolution at the defect size
- Perspective error in measurement tasks
- Poor edge contrast from mismatched lighting
- Depth of field loss after aperture changes