Optical encoders for position measurements

Details Optical encoders for position measurements Optical encoders for position measurements

2007-11-06

2007-11-06

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231170, C356S139000

Reexamination Certificate

active

11403693

ABSTRACT:
Systems and methods are disclosed for providing position measurement information. For example, in accordance with one embodiment of the present invention, a multiple-pitch grating is disclosed which is adapted to receive one or more laser beams and provide an output laser beam encoded with position information of the grating.

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R.J. Tansey et al., “Interferometer Encoder Techniques”, Jan. 8, 1988, pp. 1-52.
R.M. Tansey, “An Absolute Distance Interferometer Using A Dye Laser Heterodyne Interferometer And Spatial Separation Of Beams”, Proceedings of SPIE—The International Society for Optical Engineering, vol. 429, Precision Surface Metrology, Aug. 23-24, 1983, pp. 43-54.

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