CPC G01S 7/4813 (2013.01) [G05D 1/0088 (2013.01)] | 17 Claims |
1. A sensor apparatus comprising:
a cylindrical sensor window defining an axis oriented vertically; and
a sensor-housing cap mounted on the sensor window;
wherein the sensor-housing cap includes a top surface and a wall;
the axis intersects the top surface;
the wall extends upward from the top surface and is elongated circumferentially partially around the top surface; and
the top surface includes a plurality of ridges elongated from the wall, the ridges being elongated parallel to each other along a horizontal direction.
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