| 摘要 |
<p>The inventive sensor illuminates the powder layer ( 40 ) by means of sensing segments ( 30, 31, 32 ), said powder layer scattering the measuring beams. Flaws in the powder layer lead to increased reflection such that a reflected measuring beam is reflected into the segments ( 30, 31, 31 ). The reflected beams are guided to a control unit ( 21 ) by the fiber lines. Said control unit recognizes flaws according to fluctuations in the intensity of reflected beams and generates a corresponding control signal.</p> |
