Method and device to determine a relative reference position for

Details Method and device to determine a relative reference position for Method and device to determine a relative reference position for

1989-01-05

1990-09-11

Jordan, Charles T.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

73462, 73657, 73660, G01B 1126

Patent

active

049557165

ABSTRACT:
A method and device to determine the relative reference position for an angle measurement of an object within an angle scale covering the round angle of the entire rotation of the object and divided into several angle areas of equal size on an exposed target area on or attached to the object of which an illuminated orbit is scanned. A significant deviation of the beam characteristics at least one point on the orbit forms a reference signal, which is coupled to the angle value of an angle scale to determine the reference angle position on the object.

REFERENCES:
patent: 3644042 (1972-02-01), Kolb, Jr. et al.
patent: 3879988 (1975-04-01), Jacobs
patent: 4086808 (1978-05-01), Camac et al.
patent: 4334777 (1982-06-01), Bien et al.
patent: 4601580 (1986-07-01), Halliwell

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