Optical: systems and elements – Mirror – Including specified control or retention of the shape of a...
Patent
1996-11-12
1998-08-25
Dzierzynski, Paul M.
Optical: systems and elements
Mirror
Including specified control or retention of the shape of a...
359847, 359848, 359849, G02B 508, G02B 7182, G02B 7188, G02B 7192
Patent
active
057988781
ABSTRACT:
The control of a mirror's shape, such as for use in large reflecting telescopes, is associated with discrete points so as to avoid incurring constraints and exerting undesirable stress on the reflecting mirror through control unrelated to the mechanical characteristics. Thus, a reflecting mirror is approximated by a non-constrained circular plate having a similar mechanical structure, and an eigenfunction value arithmetic unit calculates values of Bessel-Fourier functions which are eigenfunctions of free vibrations of the circular plate. Using these function values, a mode displacement identification unit approximates a required mirror displacement, which is necessary to correct for wavefront distortion, with a linear combination up to a prescribed mode of vibration of the eigenfunction. A support mechanism command unit controls an actuator so that the value of the linear combination function equals the amount of mirror displacement at a position supported by a reflecting mirror support mechanism.
REFERENCES:
patent: 5461514 (1995-10-01), Sasaki et al.
patent: 5552006 (1996-09-01), Soliday et al.
John W. Hardy, "Adaptive Optics", Scientific American, Jun. 1994.
Asari Kouki
Mori Hiromichi
Sakai Eiichi
Dzierzynski Paul M.
Mitsubishi Denki & Kabushiki Kaisha
Sikd-er Mohammad Y.
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