| CPC G02B 6/0038 (2013.01) [G01S 7/028 (2021.05); G01S 7/4813 (2013.01); G02B 6/0056 (2013.01)] | 19 Claims |
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1. A sensing system comprising:
a radar sensor including: at least one radar transmit antenna configured transmit a signal; and at least one radar receive antenna configured to detect the signal;
a light guide disposed in the field of view of the radar sensor;
a light source optically coupled to the light guide to illuminate the light guide, wherein an entire length of the light guide extends along a plane and the light source illuminates the light guide from an edge of the plane to illuminate a length of the light guide;
a housing for the sensing system including a surface configured to reflect or diffract light from the light source away from the surface, wherein the light guide is configured to transmit at least a portion of the light from the light source towards the surface; and
a wire-grid polarizer on an interior surface of a cover, the wire-grid polarizer having a plurality of parallel metallic wires arranged in a plane and aligned perpendicular to an electric field of the radar sensor, wherein the parallel metallic wires are separated by a distance corresponding to an operating frequency of the radar sensor, and wherein the wire-grid polarizer is positioned adjacent to and extends into the light guide such that the wire-grid polarizer is configured to reflect or diffract light from the light guide.
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