Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1979-06-04
1981-06-16
Corbin, John K.
Optics: measuring and testing
By polarized light examination
With light attenuation
250237G, 336129, G01B 1114, G02B 2760, H01F 2104
Patent
active
042734487
ABSTRACT:
This invention relates to method and apparatus for improving the accuracy of optical or electrical position measuring apparatus wherein movement of one object relative to another is measured. One known system employs primary and secondary windings each comprising a multiplicity of series-connected conductors arranged on adjacent faces of relatively movable members of insulating material. In another system an optical Moire fringe pattern is moved in correspondence as regards extent and sense with the movement with the object and the number of fringes displaced from a fiducial line are counted. The improvement is applicable to either system and includes placing a series of parallel lines or parallel conductors on the scale or movable object at an angle with respect to the path of movement of the object and placing another set of parallel lines or parallel conductors on the slider or reader followed by providing for controlled movement of the scale transversely of the path of movement of the object to vary the "count" of the lines or conductors on the scale and those on the slider or reader in order to compensate for machine or scale error and render the resulting operational "counts" accurate with respect to the actual movement of the object. Adjustable scale engaging clips are employed to permit the controlled lateral adjustment of the scales.
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Corbin John K.
Punter Wm. H.
Taylor Reese
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