CPC G01S 7/4813 (2013.01) [G01D 11/245 (2013.01); G01D 11/26 (2013.01); G01S 17/89 (2013.01)] | 18 Claims |
1. A sensor apparatus comprising:
a cylindrical sensor window defining an axis oriented vertically, the sensor window including an exterior surface facing radially outward relative to the axis; and
a ramp on the exterior surface of the sensor window, the ramp including a leading surface and a trailing surface;
wherein the leading surface and the trailing surface are elongated parallel to the axis.
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