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Title: Laser Rotary Encoders In Smallest Computer Disk Drive And Largest Telescope
Author: Charles P. Wang
Source: 1994 Measurement Science Conference
Year Published: 1994
Abstract: Based on the Laser Doppler DisplacementMeter( LDDM)Technologyand using two laser beams to measure two displacements separated by a fixed distance, the rotational angle which is equal to the difference in displacements divided by the laser beam separation, can be measured. This technique is insensitive to translation, runout or other non-rotational motions. The resolution is 0.01 arcsec and the accuracy is 0.1 arcsec. The application of this encoder in servo track writing of computer disk drives and in pointing and tracking of the Very Large Telescope will be described.

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