Method for determining petal piston in a segmented imaging syste

Details Method for determining petal piston in a segmented imaging syste Method for determining petal piston in a segmented imaging syste

1990-08-23

1991-09-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359849, 359850, G01J 120

Patent

active

050497340

ABSTRACT:
A method for determining petal piston in a segmented optical imaging system. The system preferably comprises a center mirror and a set of P petals adjacent to the center mirror. The novel method is suitable for determining petal piston for each of the P petals, with respect to the center mirror, or with respect to each other. To this end, the novel method employs a three-part masking scheme, to simulate zero, positive and negative piston error, in order to develop a referrent as a measure of actual piston error.

REFERENCES:
patent: 4518854 (1985-05-01), Hutchin
patent: 4959532 (1990-09-01), Owechko

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