Optical phase noise filter using randomly placed spots

Details Optical phase noise filter using randomly placed spots Optical phase noise filter using randomly placed spots

1998-08-10

2000-02-29

Shafer, Ricky D.

Optical: systems and elements

Diffraction

348342, G02B 530

Patent

active

060316667

ABSTRACT:
An optical phase noise filter for use with an optical imaging system such as a solid-state imager or the like, including a transparent substrate; and a plurality of transparent spots randomly placed on the transparent substrate for producing a phase difference between a wavefront transmitted through the transparent spots and that portion of the transparent substrate other than the transparent spots to define an optical phase noise filter having a spatial sampling cut-off frequency and wherein the variance of the transparent spot to transparent spot distance between adjacent spots is minimized while maintaining the randomness of transparent spot placement.

REFERENCES:
patent: 2959105 (1960-11-01), Sayanagi
patent: 4480896 (1984-11-01), Kubo et al.
patent: 5585885 (1996-12-01), Muramatsu
patent: 5714284 (1998-02-01), Hirsh et al.
Kazuo Sayanagi, "Optical Noise Filter", Japan J. Appl. Physics, vol. 27, No. 10, pp. 623-632, translated by M. Ikeda, Jan. 1958.
Yukio Okano, "Optical Phase-Noise Filter for Color Portrait Photography", Proc. International Commission for Optics, (ICO-13), Conf. Digest, Sapporo, Japan, Jan. 1984.

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