Method and Sensor Unit for Detecting a Degree of Wetting of a Glass Pane

摘要

A method for detecting a degree of wetting of a glass pane, in particular a windscreen of a motor vehicle, is provided. A transmitter is arranged on the inside relative to a glass pane and emits electromagnetic waves, which are reflected according to the total reflection principle on the outer, from the transmitter's point of view the opposite surface of the glass pane, and which are received by a receiver arranged on the inside relative to the glass pane. Electromagnetic waves are emitted further from a transmitter. Waves pass through the glass pane and are scattered on particles or droplets in front of the glass pane and are received by a receiver arranged on the inside relative to the glass pane.

主权项

1. A method for detecting a degree of wetting of a glass pane, in particular a windscreen of a motor vehicle, with a transmitter which is arranged on the inside relative to the glass pane and which emits electromagnetic waves which are reflected at the outer, from the transmitter's point of view the opposite surface of the glass pane according to the total reflection principle, and received by the receiver which is arranged on the inside relative to the glass pane, wherein:
electromagnetic waves are further emitted from a transmitter, which pass through the glass pane and are scattered on particles or droplets in front of the glass pane and are received by a receiver which is arranged on the inside relative to the glass pane, the receiver is arranged between the transmitter working according to the total reflection principle and the transmitter for scattered light measuring, and there receives the electromagnetic waves, and receipt of the electromagnetic waves by the receiver is effected close to the transmitter for scattered light measuring and at more than twice the distance to the transmitter which operates according to the total reflection principle.