By moving the lenses in the orientation of the optical axis, the sharpness (contrast) of the image is continuously evaluated for a section of the image. The contrast has its maximum where the object plane coincides with the focal plane. The sensor is then positioned accordingly to this calculated position. The accuracy of the procedure is primarily dependent on the depth of field of the lens.

By combining the non-contact measuring methods of image processing and autofocus sensor, many three-dimensional measuring tasks can be solved

Sensor principle

Optical-axial (focus variation)

Accuracy

Permissible probing error up to 0.25 µm

Functionality

With the hardware of the image processing sensor (a) camera, b) imaging optics, c) measuring object and d) transmitted light illumination), images are taken in different positions on the optical axis. Based on the contrast gradient, the position of the workpiece surface is determined.

The universal measurement software for coordinate measuring machines with optics, probe, computed tomography and multi-sensor systems

The operation of machines with a wide variety of sensors, as well as the evaluation of volume data and point clouds ...

Comprehensive service around the coordinate measuring machine

Services from initial commissioning, training and maintenance to retrofitting ...