Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2006-01-30
2008-07-22
Luu, Thanh X (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C356S512000, C356S515000
Reexamination Certificate
active
07402785
ABSTRACT:
An incoming laser beam is relayed to a steering mirror and a phase correction device. The beam is relayed from the phase correction device to a focal plane array and to a wavefront sensor (WFS). Low order steering mirror tilt corrections can be based on data from the focal plane array. The WFS outputs data on multiple channels to a field programmable gate array (FPGA), with each of the WFS channels corresponding to a subaperture of the beam wavefront. The FPGA calculates phase corrections for each of the subapertures and forwards those corrections to the phase correction device. The FPGA also calculates tilts for the steering mirror based on the WFS output data, which tilts can be used instead of tilts based on focal plane array data. The phase corrections may be based on modulo 2π phase error calculations and/or modal phase error calculations.
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Banner & Witcoff , Ltd.
Livedalen Brian J
Science Applications International Corporation
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