The key to the QED’s revolutionary metrology capabilities is subaperture stitching. The stitching process essentially reconstructs a full-aperture map of a surface from a collection of smaller (sub-aperture) maps, each covering only a portion of the whole surface. While this would be straightforward for flat (plano) optics, it becomes much more complicated for non-flat surfaces, especially for aspheric shapes.
Advanced software and hardware developments enable, with very high accuracy, an automated, subaperture metrology solution. QED’s stitching algorithms use an advanced optimization method to minimize the discrepancies between overlapping regions of subapertures caused by several sources of systematic and random measurement error. Through its integrated calibration capability, the system can deliver better accuracy than a standard full-aperture test.
QED then combines interferometry, patented stitching algorithms and software to automate the entire package. Integration of the measurement design, motion control, phase data acquisition and data analysis allow complex stitched measurements to be made with a simple push of a button.
Measure smarter. Measure better.
SSI brings more capability and flexibility to precision optics metrology.
QED’s Subaperture Stitching Interferometry (SSI) produces better measurements on a broader range of parts than any other measurement system.
SSI Metrology, exclusively from QED, is one of the most powerful and flexible metrology processes available to optics manufacturers. With SSI , improvements in the accuracy, resolution, reproducibility and reliability of your measurements will result in improved productivity and greater confidence. Intuitive and easy-to-use, SSI Metrology systems fit seamlessly in your shop. They can be used as both in-process metrology tools, and as end of the line, final quality control measurement systems.
The ASI(Q) can measure a wide range of aspheres and freeforms with accuracy and speed. Choose the machine configuration that works best in your shop.Learn More
QIS is a standard offering on the ASI(Q) platform, or you can upgrade your older ASI or SSI-A metrology system with a QIS. QIS is also sold as a standalone interferometer.Learn More