Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1990-12-14
1992-11-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356121, G01J 120
Patent
active
051645785
ABSTRACT:
An improved two-dimensional optical centroid processor ("OCP") wavefront sensor is described in which a scanning mirror 146 scans the wavefront of input light 130 to provide a scanned beam 148 (i.e. a portion of the wavefront). The scanned beam 148 is focused on an OCP 168 filter comprising four rows of mask cells. The filtered light emanating from the cells impinges on one-dimensional photodetector devices 192, 198, 202, 206 (i.e. photodetector rows). Thus, the scanning of the wavefront by the scanning mirror provides two-dimensional measurement while employing one-dimensional photodetector devices. Each of the photodetector devices provides an output to a ratio calculator 201 which is used to correct the tilt in the wavefront by driving a deformable mirror (not shown).
REFERENCES:
patent: 4141652 (1979-02-01), Feinleib
patent: 4399356 (1983-08-01), Feinleib et al.
patent: 4712913 (1987-12-01), Bareket
patent: 4725138 (1988-02-01), Wirth et al.
Baran Bruce W.
Bruno Theresa L.
Schmutz Lawrence E.
Wirth Allan
Witthoft Carl G.
Kosakowski Richard H.
Le Que T.
Nelms David C.
United Technologies Corporation
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