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Advanced Engraving Of Angle-Encoder DisksPrecision increased over mechanical engravers. Laser pulses timed according to rotational speed of rotor electrostatically suspended in vacuum marks angular-encoder disk mounted on lower end of rotor. Precision of timing circuitry and low rotational damping (damping time about 700 years in high vacuum) results in highly-precise angular intervals. System conceived to meet need for increased precision of angular measurements in advanced scientific instruments.
Document ID
19890000325
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Polstorff, Walter K. (NASA Marshall Space Flight Center, Huntsville, AL.)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 6
ISSN: 0145-319X
Subject Category
Fabrication Technology
Report/Patent Number
Report Number: MFS-28294
ISSN: 0145-319X
MFS-28294
Accession Number
89B10325
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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