Method for simultaneously determining coarse and fine petal pist

Details Method for simultaneously determining coarse and fine petal pist Method for simultaneously determining coarse and fine petal pist

1991-02-28

1992-06-09

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

G01M 1100

Patent

active

051209489

ABSTRACT:
A method for simultaneously determining coarse and fine petal piston in a segmented imaging assembly. The assembly preferably comprises a source of radiation that outputs a radiation beam; and, a segmented imaging system comprising a reference component and a test component, which components can be used to form an imaged radiation beam. The method comprises a first step of intercepting preselected portions of the imaged radiation beam with a novel composite mask. The composite mask comprises apertures which are dedicated to coarse petal alignment, and four phase retardation regions dedicated to fine petal alignment. The first step creates a real time masked image. A step of comparing the real time masked image against a family of off-line images generated for a sequence of known petal position errors, can provide the magnitude of the fine piston, while a step of interrogating an envelope and a fine structure spacing of the real time masked image, can provide the magnitude of the coarse piston.

REFERENCES:
patent: 4719343 (1988-01-01), Tressler, III
patent: 4725138 (1988-02-01), Wirth et al.
patent: 4750818 (1988-06-01), Cochran
patent: 4950878 (1990-08-01), Ulich et al.
patent: 5049734 (1991-09-01), Marino

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