Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1985-12-24
1988-02-16
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1114
Patent
active
047251468
ABSTRACT:
A system for determining the position of an object in which a moving periodic pattern is projected onto the object. A sensor on the object generates a sensor signal related to the periodic pattern. A reference signal is generated relating to the position of the moving periodic pattern. The sensor signal and the reference signal are compared to determine the position of the object. The pattern may be generated by projecting light through two gratings which are separated and have the same pattern. Errors created by instability or nonisotropy can be corrected employing a third grating having a different pattern and generating a correction value related to the difference between the position of the object determined employing the pattern generated by the two gratings and the pattern generated by the third grating. The moving nature of the pattern may be created by employing a fixed projector and a moving mirror. The reference signal may be generated by a sensor in the field of the moving periodic pattern fixed with respect to the coordinate system in which the position of the object is determined or by monitoring the position of the rotating mirror.
REFERENCES:
patent: 3586665 (1971-06-01), Weyrauch
patent: 3662180 (1972-05-01), Jorgensen et al.
patent: 3704070 (1972-09-01), Johnson et al.
patent: 3799675 (1974-09-01), Johnson et al.
patent: 3867036 (1975-02-01), Detwiler et al.
patent: 4176276 (1979-09-01), Kaul et al.
patent: 4231662 (1980-09-01), Feinland et al.
patent: 4272196 (1981-06-01), Indebetouw
patent: 4373816 (1983-02-01), Laib
Novon, Inc.
Rosenberger R. A.
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