| 摘要 |
An apparatus for filtering a beam of electromagnetic radiation, particularly an x-ray beam with different filer stages or levels has two rotation elements that are rotationally attached to a base part, each having at least one filter, the respective filters being different from one another. The two rotation elements are arranged at the base part 50 that a serial arrangement of a filter of the first rotation element and a filter of the second rotation element can be introduced into the beam, so that different filter stages can be set by different rotary motions of the first rotation element via an overriding clutch. Only a single drive is used to generate a rotary motion of the first rotation element. The apparatus enables a large number of filter stages to be selected with a compact structure. |
