Detector array for use in interferometric metrology systems

Optics: measuring and testing – By particle light scattering – With photocell detection

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356356, 250237G, G01B 902

Patent

active

055305431

ABSTRACT:
A detector is described, intended for use in metrology systems of the type which produce interference fringe patterns which contain a phase which is characteristic of the parameter under measurement, particularly displacement or position. The detector is in the form of an array of elements whose outputs are electrically interconnected so as to form three or more signals displaced from one another in phase by a fixed amount. The detector is provided on a single monolithic, silicon substrate using microelectronics techniques.

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patent: 4828392 (1989-05-01), Nomura et al.
patent: 5098190 (1992-03-01), Wijntjes et al.
patent: 5317385 (1994-05-01), Silva et al.
patent: 5333048 (1994-07-01), Michel et al.
patent: 5357337 (1994-10-01), Michon et al.

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