Z axis measuring with autofocus works by sensing the contrast level in the image of your part. But many surfaces (such as glass, clear plastic, and mirror-like finishes) create images with extremely low, or worse, nonexistent contrast. How can these be measured? With the Grid Projector accessory from OGP.
The Grid Projector is available for SmartScope ZIP, SmartScope Quest, SmartScope ATS, and SmartScope Apex video measuring systems.
Grid Projector Technology
The Grid Projector works by projecting a grid pattern onto the surface of the part undergoing inspection. The system is designed so that the image of the grid will only appear in focus when the surface of the part is exactly coincident with the focal plane of the optics. The autofocus routine can then use the contrast contained in the grid image just as if it were present in the surface of the part. And since the autofocus algorithm is finely tuned to the characteristics of the grid image, repeatability is significantly improved.
- Allows Z axis measurement of previously "un-measurable" surfaces due to insufficient contrast.
- Improves measurement repeatability.
- Ideal for parts with translucent layers.