Development Of An Interferometric Encoder For High Resolution Angular Measurements

R. J. Tansey; S. Holly

doi:10.1117/12.944210

3 May 1988 Development Of An Interferometric Encoder For High Resolution Angular Measurements

R. J. Tansey, S. Holly

Proceedings Volume 0887, Acquisition, Tracking, and Pointing II; (1988) https://doi.org/10.1117/12.944210
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

lhis report demonstrates the use of a grating in a lateral heterodyne interferometer to make high resolution angular measurements at high speed. Depending on choice of grating, various range, resolution, and speed tradeoffs can be made. Details of two systems will be shown which use gratings with a pitch of 25 microns and 2 microns. The system using a 25 micron grating can track a 20 cm. shaft at 25 rad/sec with 284 nanoradian resolution, and the 2 micron system the same shaft at 2 rad/sec and 36 nanoradian resolution.

Citation Download Citation

R. J. Tansey and S. Holly "Development Of An Interferometric Encoder For High Resolution Angular Measurements", Proc. SPIE 0887, Acquisition, Tracking, and Pointing II, (3 May 1988); https://doi.org/10.1117/12.944210

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