| 摘要 |
<p>The device (1) has an optical control unit (20) with a control receiver (21), where the optical control unit is arranged in direct proximity to a measuring unit (6). The optical control unit is aligned with the measuring unit in such a manner that the control unit partially covers cross section of a control light beam and cross section of a measuring light beam in a background plane, which lies behind the measuring range. The control beam does not overlap with a light beam, which is emitted from a light emitter (4). An independent claim is also included for a method for determining particle concentration within a measuring range according to reverse scattered light principle.</p> |
