The Werth 3D-Patch is a focus variation sensor that captures a surface area and automatically adapts sensor parameters to the surface characteristics of the workpiece. It also includes HDR functionality.The sensor makes it possible to perform 3D surface deviation analyses as well as purely dimensional evaluations.

The Werth 3D-Patch can be used to capture the topography of small, detailed areas with high lateral resolution. It uses objectives with a large aperture and low depth of field to achieve high accuracy. The sensor is very easy to use with WinWerth® measuring software.

For measurements using the 3D-Patch, the image processing sensor is moved perpendicular to the workpiece surface. When the surface is in the focal plane, the image is sharp and the contrast is at a maximum. The 3D measurement points are determined from the sensor positions that have the maximum local contrast.

Using the patented 3D-Patch/HA, an HDR function allows stacks of images to be recorded with different exposure times and surfaces with nonuniform reflection to be measured. An intelligent software function for optimally setting the exposure time is included. A variety of filter options ensures reproducible and reliable results. All it takes is a simple click on the CAD model to calculate the standard geometric elements (patented).If there is no nominal data available, these can be generated via automatic segmentation.

The Werth 3D-Patch can be used, for example, to perform coplanarity measurements on the leads of integrated circuits (IC).Coplanarity is a critical dimension for soldering results, because when the IC is placed on the circuit board, none of the leads should have too great a distance from the board. Other application examples include measurements of edge rounding or fine structures on embossing punches.