| 摘要 |
An optoelectronic sensor device is described for recording of soiling on a transparent cover, with at least one light source that emits at least two light beams, a test surface arranged in the cover, having a concave surface exposed to environmental effects, through which the light beams emerge and reenter, as well as at least one receiver that measure the radiation powers of the light beams, on which the light beams are imaged independently of each other after reentry. The test surface has at least two areas with different microstructurings, in which a first microstructuring is designed, so that a liquid applied to the area provided with the first microstructuring is held together drop-like, and a second microstructuring is designed, so that a liquid applied to the area provided with the second microstructuring is distributed film-like, in which at least a first light beam emerges and reenters through the first area and at least a second light beam emerges and reenters through the second area, so that by comparison of the radiation powers of the two light beams, a conclusion can be drawn concerning the transparency of the cover exposed to soiling. In addition a method is described for determination of the transparency of soiling by a transparent surface exposed to environmental effects.
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