Application of Zeeko's Novel Random Tool Path for Improvement of Surface PSD

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX09CF41P
Agency Tracking Number: 084999
Amount: $84,321.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: S2.05
Solicitation Number: N/A
Small Business Information
3495 Kent Ave. K100, West Lafayette, IN, 47906-5391
DUNS: 186676446
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 John Kelchner
 Principal Investigator
 (765) 775-1010
Business Contact
 John Kelchner
Title: Business Official
Phone: (765) 775-1010
Research Institution
A well known problem in the fabrication of aspheric optical surfaces lies in surface irregularities inherent in the figuring process. Low-spatial frequency errors (figure errors) cause distortion in the system wavefront, resulting in degradation of the point spread function. Mid-spatial frequency errors cause small-angle scattering of light (flare), which reduces image contrast. High-spatial frequency errors scatter light out of the optical beam over larger angles, reducing the energy throughput in an optical system. The Zeeko Precessions polishing is a sub-aperture process that has been developed for the control of form and texture in the production of aspheric and other optical surfaces. The Precessions process is deterministic and provides dramatic reductions in production time due to its high removal rate and repeatability. Similar to other sub-aperture finishing processes, the Precessions process is prone to leave mid-spatial frequency defects on the surface. Zeeko has developed a unicursal random tool path that does not follow a regular pattern and is non-crossing. The goal of this Phase I project is to expand on promising initial results obtained by using the random tool path. The results generated by the research project will be used to demonstrate and improve the performance of the Zeeko polisher for this critical application. We propose a study that employs the polishing methodology used by Zeeko Technologies to determine whether trial procedures using the Zeeko approach can effectively correctively finish an optic without inducing unwanted frequencies onto the surface of the part.

* Information listed above is at the time of submission. *

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