| 摘要 |
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 onto the segments (30, 31, 32). The reflected beams are guided to a control unit (21) by fibre lines. Said control unit recognises flaws according to fluctuations in the intensity of reflected beams and generates a corresponding control signal. |
