Optical alignment by use of arrays of reflective or diffractive

Details Optical alignment by use of arrays of reflective or diffractive Optical alignment by use of arrays of reflective or diffractive

1992-07-29

1994-01-25

Kratz, Peter

Optics: measuring and testing

By alignment in lateral direction

With light detector

2502061, 2502086, 356153, G02B 2762, G01B 1127

Patent

active

052820165

ABSTRACT:
A method and system of alignment of two mechanical members of a mechanical structure, particularly the primary and secondary mirrors (22, 24) of a telescope (20), is provided by a set of auxiliary optical elements (40) disposed on the primary mirror and a corresponding set of detectors (42) disposed on the secondary mirror. The array of detectors corresponds in configuration to the array of auxiliary optical elements so that there is correspondence between positions of auxiliary optical elements with positions of detectors about a common central axis (38) of the two mirrors. A source (44) of light disposed on the axis between the two mirrors illuminates the auxiliary optical elements to develop a set of eight beams, in a preferred embodiment of the invention, which are directed to the optical elements. There are two subsets of the beams, one set comprising four crisscrossing beams (C) which cross the central axis, and the second subset (D) traveling directly between the mirrors without crossing the central axis. The locations of reception of the beams relative to the detectors is sensed to ascertain the presence of any failure of alignment, thereby to permit correction of alignment with respect to tilt, decentering, despace, as well as a bowing of the primary mirror. The optical elements may be fabricated as holographic optical elements.

REFERENCES:
patent: 2352179 (1944-06-01), Bolsey
patent: 2577807 (1951-12-01), Pryer
patent: 4070117 (1978-01-01), Johannemeier et al.
patent: 5020907 (1991-06-01), Ibe
patent: 5080482 (1992-01-01), Berz et al.
patent: 5212392 (1993-05-01), Berkcan et al.

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