Sensor de suciedad y procedimiento para detectar la cantidad de suciedad de una superficie

摘要

The invention relates to a sensor (20) for detecting the amount of dirt on a surface, said sensor comprising: a transparent surface (21) exposed to dirt; a light emitter (22) for emitting a beam towards the transparent surface; a first light receiver (23) and a second light receiver (25); means (24) disposed between the light emitter (22) and the transparent surface (21) and configured to allow part of the light from the emitter to pass towards the transparent surface (21) and to re-direct the rest of the light towards the second receiver (25); acquisition and processing means (26). The first light receiver (23) is configured to receive light diffused upon impact with dirt on the external face (21e) of the transparent surface (21). The acquisition and processing means (26) are configured to calculate a percentage measurement of the degree of dirt on said transparent surface (21).