Space Flight Center
1996 Phase II
In-Situ Profiling of Large Aspherics
Developed a non-interferometric,
optical technique for measuring absolute aspheric shape over the full
surface of large mirrors to the nanometer level, without the need for
a known reference surfaces.
Color Contour Surface Map Showing
Mirror Features Only a Few Nanometers
- Conceived of and proved the
theory behind a new concept for optically measuring the aspheric
shape of large mirror surfaces.
- Developed a working prototype
instrument under the SBIR Phase II contract.
- Talks are ongoing with an established maker of large optics to discuss development and integration of an instrument into their fabrication and metrology facilities.
- Achieved nanometer-class agreement between our measurements and another potential customer. Analysis indicates that our measurement error is a small fraction of a nanometer.
- Completed a Phase III contract with the Smithsonian Astrophysical Observatory to use the prototype to measure the surface of NASA's HIREX Pathfinder mirror (a sphere with a 200 mm diameter and a 60 meter radious of curvature.)
- Important subsystem enhancements resulted from a follow-on SBIR Phase II project, enabling measurements of millimeter-class asphericities.
- In a second follow-on SBIR Phase II project we are in the process of integrating other metrology capabilities and a polishing capability into a single machine.
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to NASA SBIR Success Listings
Aerospace, Optics, Test & Measurement
Curator: SBIR Support 04/20/07