| 摘要 |
A fog sensing system is disclosed having a sensor enclosure (226'') having a light source (52) and a light detector (56) therein. The sensor enclosure (226'') has an opening with a filter (308) thereover. The sensor enclosure (226'') is particularly suited for applications on an automotive vehicle. As the automotive vehicle travels, air rushing by an opening in the enclosure creates a low pressure within the enclosure (226'') so that air is drawn through the filter (308) and over the light source (52) and the detector (56). The moving clean air continuously washes over the light source (52) and detector (56) so that dirt or other contaminants are not built up on the detector (56) and light source (52). |
