Device for operating an optoelectronic rain sensor

摘要

The device has a transmitter (10) to transmits light (12) on to a window. A receiver (16) picks up the reflected beam (20). When the transmitter is switched off, the reflected ambient light (18) is detected to provide a stray light signal. When the transmitter is switched on, the reflected ambient light is again measured and the component of the signal which indicates the presence of rain is obtained by compensating for the stray light signal. An Independent claim is also included for a method for operating the rain sensor.