Patent
1986-06-02
1990-02-20
Arnold, Bruce Y.
350 37, 350417, 350432, 350443, G02B 2756, G02B, G02B, G02B 532
Patent
active
049021001
ABSTRACT:
A method and apparatus are disclosed for correcting complex phase aberrations in a thick window in an airborne vehicle using the technique of phase conjunction. A conjugate element of the window is fabricated by machining. The conjugate element and an imaging lens are positioned behind the window such that the window is imaged onto the conjugate element. Phase aberrations produced when broadband radiation is passed through the window are removed when the wavefront passes through the imaging lens and conjugate element. In another embodiment, halogram is prepared of the wavefront passing through the window. The spatial phase information encoded in the hologram is read out by a phase measurement system and then fed into a computer where the conjugate wavefront is calculated. The conjugate wavefront is then written into a thin corrector plate of refractive material. The corrector plate with the conjugate wavefront imprinted thereon is then placed at the location where the hologram was initially formed. Phase aberrations produced when broadband radiation is passed through the window are removed when the wavefront passes through the plate. In another embodiment, the hologram is made of the conjugate element and imaging lens as positioned behind the window for phase aberration correction purposes instead of the window itself.
REFERENCES:
patent: 3619021 (1971-11-01), Biedermann et al.
patent: 3646335 (1972-02-01), Cindrich
patent: 3708217 (1973-01-01), McMahon
patent: 3760344 (1973-09-01), Hildebrand
patent: 4421380 (1983-12-01), McGrew
Reynolds, G. et al., "Phase Conjugation with Incoherent Radiation," Journal of the Optical Society of America, vol. 72, No. 12, Dec. 1982, p. 1746.
Kogelnik, H., "Holographic Image Projection Through Inhomogeneous Media," Bell System Technical Journal, vol. 44, No. 10, Dec., 1965, pp. 2451-2455.
Reynolds, G. et al., "Holographic Phase Compensation Techniques Applied to Human Cataracts," Optical Engineering, vol. 12, No. 1, Jan./Feb., 1973, pp. 23-35.
Shen, M. et al., "Lensless Matched Spatial Filter Correlator Experiments," Optics Communications, vol. 34, No. 3, Sep. 1980, pp. 311-315.
Angus, J. et al., "Infrared Image Construction with Computer-Generated Reflection Holograms," Applied Optics, vol. 16, No. 11, Nov., 1977, pp. 2798-2799.
Reynolds George O.
Servaes Donald A.
Arnold Bruce Y.
Callaghan Terry S.
Honeywell Inc.
LandOfFree
Method and apparatus for removing phase aberrations in windows u does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for removing phase aberrations in windows u, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for removing phase aberrations in windows u will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1612067