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ASPHERE METROLOGY

Photonics Spectra
Apr 2007
QED Technologies Inc.Request Info
 
QED-Technologies_SSIA.jpgQED Technologies Inc. has released the SSI-A, a metrology tool for aspheres. It makes full-aperture interferometric measurements without the need for dedicated null lenses by taking several subapertures over the entire work surface and stitching the results together into a lattice to synthesize a full-aperture map. It automatically selects an appropriate transmission sphere; defines the lattice; measures wedge, centration and radius; moves the workpiece and nulls the interference fringes; and automatically sets the pixel scale setting, without lateral calibration. It measures almost any plano, convex or concave surface up to 200 mm in diameter, calculates and compensates for reference wave errors, and provides radius of curvature and surface figure measurements automatically.


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