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New High-Precision 2D/3D Measuring Station Evaluates Topography During Multi-Step Grinding/Polishing Operations

Mahr Federal has introduced a new high-precision 2D/3D measuring station for checking contour and surface topography of aspheric optical lenses and other components during multi-stage grinding and polishing operations. The MarSurf LD 130 and 260 Aspheric units feature high measuring speed, measuring range of up to 260 mm, vertical resolution of 0.8 nm, and form deviations of less than 100 nm.

"The market for high precision optics is growing very rapidly," said Pat Nugent, Vice President for Metrology Systems at Mahr Federal, headquarters of the Mahr group's US operations. "We see tremendous opportunities both to support existing applications and to apply Mahr's extensive metrology expertise in developing new systems to meet future needs."

The MarSurf LD 130 and 260 Aspheric facilitate the multi-set grinding and polishing manufacturing process for high precision optics by providing fast accurate 2D and 3D measurements for the evaluation of contour and surface topography. The system can be used for spherical and aspherical lenses, as well as many types of cylinder lenses, lens mounts, housings, and other mechanical components. Measuring speed is up to 10 mm/s for large lenses, and down to 0.02 mm/s for micro lenses.

For 2D measurement the system generates a linear scan over the zenith of the lens. Collected data is compared to the nominal aspheric lens contour and presents results as PV or RMS values and slope error. For 3D measurements, the system generates several linear profiles across the center of the lens. The lens is then rotated and several circular profiles gathered. Combined, these measuring points create the surface profile, which can be compared to the nominal shape via a sagitta table or 3D-point cloud. The differential profile can be output as a color-coded height picture, and both 2D scans and 3D topography can be exported in machine-readable format for closed loop process control.

The MarSurf LD 130/260 Aspheric includes a new probe system with a biomimetic probe arm design that provides increased stiffness, damping, and lower moment of inertia. A chip integrated in the probe arm provides probe identification and parameters, and verification of correct mounting position, allowing probe arms to be changed without recalibration. Automatic probe positioning allows even discontinuous surfaces to be measured.

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