Patent ID: 11946873
Assignee: ROBERT BOSCH GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A detection device for a sensor, the detection device comprising:
a first light guide;
a second light guide laterally offset from the first light guide; and
a detector;
wherein:
(a) the first light guide is arranged relative to a light source of the sensor and relative to a cover of the sensor through which a first portion of light generated by the light source of the sensor passes to outside of the sensor, and (b) the second light guide is arranged relative to the cover of the sensor and relative to the detector such that a second portion of the light generated by the light source of the sensor is guided by the first light guide to be internally reflected, within the cover, between opposing surfaces of the cover until reaching the second light guide, which then deflects the second portion of the light that has reached the second light guide to the detector in an interior of the sensor;
the detector is configured to monitor whether the cover is contaminated by identifying an extent of attenuation of the second portion of the light that has been guided to the detector within the interior of the sensor; and
at least one of the first and second light guides is a hologram.