Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1998-10-20
2000-07-11
Font, Frank G.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1114
Patent
active
060881070
ABSTRACT:
The present invention relates to a high resolution positioner that may be used to measure the lateral displacement between one object, such as a beam compactor, relative to another object, such as a rear cone, which are separated over a moderate distance. The positioner includes a relatively small laser mounted on one of the objects, such as the beam compactor, which is dithered in orthogonal directions creating a Lissajous pattern. The Lissajous pattern is detected by a pinhole detector on a separate object, such as a rear cone. With such a system, displacement of one object, such as a rear cone bench, relative to another object, such as a beam compactor bench, can be relatively accurately determined and used to develop an error signal providing closed loop alignment of the two objects relative to each other.
REFERENCES:
patent: 3857636 (1974-12-01), Angelbeck
patent: 5286964 (1994-02-01), Fountain
patent: 5763870 (1998-06-01), Sadler et al.
Font Frank G.
Stafira Michael P.
TRW Inc.
Yatsko Michael S.
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