Patent ID: 11936845
Assignee: WAYMO LLC
Field: Measurement (Instruments)
Classification: CPC B  H  G | IPC B  G  H

Claim 19:
20. A method comprising:
causing a plurality of light-emitter devices to emit emission light toward a first optical coupler affixed to a first surface of an optical element, wherein the first optical coupler is optically coupled to the optical element;
detecting, by a plurality of detector devices, detector signals that correspond to at least a portion of the emission light by way of the optical element and a second optical coupler affixed to the first surface of the optical element, wherein the first optical coupler, the second optical coupler, and the optical element are configured to guide the emission light by total internal reflection, wherein the first optical coupler and second optical coupler comprise:
a plurality of lensed portions, wherein each lensed portion is configured to be optically coupled to a corresponding region of the optical element, and at least one of: a light-emitter device of the plurality of light-emitter devices, or a detector device of the plurality of detector devices; and
determining, based on the detector signals, a contaminated region of the optical element.