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Aspheric Measuring Station

Photonics Spectra
Mar 2014
Mahr Inc.Request Info
PROVIDENCE, R.I., Dec. 18, 2013 — Mahr Federal Inc. has released the MarSurf LD 130/260, a 2-D/3-D measuring station for checking contour and surface topography of aspheric optical lenses and other components during multistage grinding and polishing operations.

The system offers a measuring range up to 260 mm, vertical resolution of 0.8 nm and form deviations of <100 nm. It can be used for spheric and aspheric lenses as well as many types of cylinder lenses, lens mounts, housing and other mechanical components. Measuring speed is up to 10 mm/s for large lenses and down to 0.02 mm/s for microlenses.

For 2-D measurements, the system generates a linear scan over the zenith of the lens, then compares the data to the nominal aspheric lens contour. For 3-D measurements, it generates several linear profiles across the center of the lens, then rotates the lens to gather circular profiles. Combined, these measuring points create the surface profile, which can be compared with the nominal shape via a sagitta table or 3-D point cloud.

The system also includes a probe system with a biomimetic probe arm that provides increased stiffness and damping, and a lower moment of inertia. An integrated chip provides probe identification and parameters, and verification of correct mounting position, allowing probe arms to be changed without recalibration.


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