Testing requirements

Detecting inner hole diameter metal parts, metal parts outline dimensions.

The difficulty of the Project

Ordinary lens, because of the light angle is large, shooting inner hole when gap due to the hole wall thickness, shadow and the shadow area and size varies due to the hole location.In a normal lens because of the depth of field is small, can't focus inner hole and the outline shape clearly, secondary imaging are required for testing or the use of two sets of optical system is a waste of cost, and detection efficiency.Ordinary lens distortion affects cylindrical contour detection accuracy.

The solution

Use BT series double telecentric lens.

Application advantages

Distortion, distortion, generally less than 0.1%, to 1/20 of normal lens;

High heart, heart is far less than 0.1%, which is the core of the double telecentric lens, can completely avoid shadows caused by incident light.

The depth of field is big, can be one-time perfect focus of different distance of the surface of the parts, average depth of field to ten times the normal lens.

Application development

For backlight detection optical defects, dimension precision requirements.Image distortion have quantitative control mining as demand (0.1%).Using a set of optical system to solve ordinary lens system in the plane of the different height of the gap between a test requirements.

Author：BTOS Editor