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Autofocus sensor

Contrast evaluation for measurement of geometrical characteristics

Benefits

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

Technical Data

Optical-axial (focus variation)

Permissible probing error up to 0.25 µm

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.

Compatible Sensor Principles

Sensor

Werth Image Processing BV

Phone	+49 641 7938-0
Telefax	+49 641 7938-719
Email	mail@werth.de

Autofocus sensor

Contrast evaluation for measurement of geometrical characteristics

Distance measurement by focus variation with the hardware of the image processing sensor

Other benefits

Sensor principle

Accuracy

Functionality

Further equipment for Autofocus sensor

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

Comprehensive service around the coordinate measuring machine

Workpiece examples Autofocus sensor