Coherent wave imaging and/or recording technique for reducing th

Details Coherent wave imaging and/or recording technique for reducing th Coherent wave imaging and/or recording technique for reducing th

1975-07-30

1977-07-12

Stern, Ronald J.

350162SF, G03H 116, G02B 2738

Patent

active

040350550

ABSTRACT:
A mask is used to sequentially illuminate successive elemental areas of an object (by changing the position of the mask) to obtain from each relatively small elemental area a diverging object-information component of coherent wave energy which is passed through a relatively large cross-sectional aperture of imaging and/or recording means. The fact that this cross-sectional aperture is so much larger in area than the area covered by any dust or optical defects of the imaging and/or recording means markedly reduces spurious coherent-wave patterns normally produced by such dust or optical defects. Further, since the illumination is not diffuse, no speckle pattern problem exists.

REFERENCES:
patent: 3620598 (1971-11-01), Brandt
patent: 3689129 (1972-09-01), Lurie
patent: 3749469 (1973-07-01), Gayeski
patent: 3837725 (1974-09-01), Bricot et al.
Stroke et al, Physics Letters, vol. 15, No. 3, Apr. 1965, pp. 238-240.

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