Rotatable cylinder dual beam modulator

Details Rotatable cylinder dual beam modulator Rotatable cylinder dual beam modulator

G - Physics

21

K

G21K 1/02 (2006.01) G01N 23/04 (2006.01) G01N 23/201 (2006.01) G21K 1/06 (2006.01)

Patent

CA 2389871

A dual beam modulator (10) includes a rotatable cylinder (12) having annular walls (14, 15) and a set of a plurality of discrete chordal passages (18) extending through the walls between opposing holes in the outer surface of cylinder walls (14, 15). Each of the passages (18) is spaced radially about each of the walls (14, 15) and longitudinally in the direction of the longitudinal axis of the cylinder (12) for producing, in response to an incident fan beam of radiation (30), a series of discrete pencil beams (28) as the cylinder (12) rotates. The cylinder (12) further has reduced radius sections (16, 17) on the outer surface of the walls (14, 15) for periodically passing the incident fan beam (30) alternately with the series of pencil beams (28) as the cylinder (12) rotates.

Cette invention concerne un modulateur à double faisceau (10) comprenant un cylindre rotatif (12) à paroi annulaire (14, 15) et un ensemble de passages (18) séparés tangentiels au travers de la paroi entre des trous opposés sur sa surface extérieure de la paroi (14, 15). Chacun des passages (18), qui sont décalés radialement sur la paroi (14, 15) et longitudinalement dans le sens de l'axe longitudinal du cylindre (12), produisent en réponse à un faisceau éventail incident de radiations (30) une série de faisceaux en pinceau séparés (28) lorsque le cylindre (12) tourne. Comme le cylindre (12) présente une section de rayon réduit sur la surface extérieure de la paroi (14, 15), il laisse passer le rayon éventail (30) en alternance avec des faisceaux en pinceau séparés (28) au fur et à mesure qu'il tourne.

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