Hadamard filter design

Details Hadamard filter design Hadamard filter design

1975-09-29

1977-02-15

McGraw, Vincent P.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250237G, G01J 342

Patent

active

040079899

ABSTRACT:
An improved Hadamard filter is disposed between the dispersive element and detector of a Hadamard transform spectrometer. The detector has a series of linear photo-active diode elements arranged in the focal plane of an array of optical lenses. The lenses may be a series of Fly's-Eye lenses with each series arranged to overlay the corresponding linear element of the detector, or may be a cylindrical lens overlying a corresponding detector element. Individual lenses of the Fly's-Eye lens or individual elements of the cylindrical lens are selectively masked according to the desired matrix so as to perform the Hadamard transform spectrometry.

REFERENCES:
patent: 3348264 (1967-10-01), Rice et al.
patent: 3533682 (1970-10-01), Fleisher et al.
patent: 3640625 (1972-02-01), Ibbett et al.
patent: 3929398 (1975-12-01), Bates

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