TOSHIBA TELI CORPORATION

About Surface Flaw Detection Scope

Do you have any trouble about the inspection of flat surface?
Surface Flaw Detection Scope (SFD Scope) is suitable to detect the flaws on the glossy surface without software processing.
We would like to introduce how SFD Scope inspects the flaws.

Depth of field, hyperfocal distance, and hyperfocal sequence

The depth of field is the distance between the nearest and the farthest objects in an image that appear acceptably sharp.

This white paper describes, in an easy-to-understand way, the depth of field in relation to the hyperfocal distance and the hyperfocal sequence.

Which lens should I use to capture this image

Machine vision requires a photographic lens to project an image of an object onto a camera’s image sensor.
Its selection method is described in our product brochures and on our website as well as in commercially available books and trade journals. However, we receive many questions about the relationship between a field of view (FoV, i.e., the area of the inspection captured on the camera’s image sensor) and a camera’s optical system although it can be calculated very easily.
This white paper gives several examples to plainly describe how to select a camera lens that satisfies your FoV requirement.