Examples of images taken with Hole Inspection Optics

Perfect focusing is maintained throughout	the entire depth of a hole, writings inside a cavity, as well as scratches and tiny defects are easily imaged
Conical cavity inspection is possible from both sides	Square, polygonal or irregular cross section objects can be inspected.

Hole Inspection optics can image cavities whose diameters and thicknesses span over a wide range of values.
For a given hole diameter, the table below lists the maximum cavity height allowed for both high resolution imaging (small pixel sizes) and normal resolution imaging (> 5 micron pixels) applications; the r ratio indicates how much of the detector area gets covered by the image of the hole inner walls.
The listed working distance values ensure that the object image is exactly inscribed into the short side of the detector, thus maximizing r ratio and image resolution.

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