Optical detector for foreign bodies or coatings on transparent plate - has transceiver intermediate foil with highly transparent regions only in light path input and output areas with adhesive to prevent peeling

摘要

An arrangement for the optical detection of foreign bodies (17) or a coating on the surface of an optically transparent plate (16) contains at least one transmitter (12) and at least one receiver (13) with an intermediate foil (18) between a sensor (10) and the plate. The foil consists of an optically transparent material in the region of the transmitter and receiver. Total reflection occurs at each measurement region and the foil is adhesive on the side facing the sensor and plate in the remaining regions. USE/ADVANTAGE - Highly transparent foil material is only required in light path inlet and outlet regions. Windscreen and other windows of motor vehicle to be kept clean. Headlights and rear cluster lights as well as fog lights.