NASA NTRS · 19890000325
Advanced Engraving Of Angle-Encoder Disks
Abstract
Precision 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.
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Polstorff, Walter K.. 1989-06-01. Advanced Engraving Of Angle-Encoder Disks. https://ntrs.nasa.gov/citations/19890000325
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