| 摘要 |
A sensor ( 1 ) for monitoring the immediate vicinity of a motor vehicle ( 10 ) comprises an infrared emitter ( 3 ) that is arranged behind a lens ( 2 ) and a receiver ( 4 ) for reflected infrared radiation, as well as an evaluation unit ( 5 ) for detecting the presence of an object ( 13 ) in the immediate vicinity of the motor vehicle, wherein a signal can be forwarded from the evaluation unit ( 5 ) to a control device ( 19 ) in the motor vehicle ( 10 ). In order to also ensure the proper function of the sensor ( 1 ) when the lens ( 2 ) is soiled, an infrared emitter ( 6 ) and a receiver ( 7 ) are provided for measuring the transparency of the lens ( 2 ), wherein the evaluation unit ( 5 ) is able to increase the power of the infrared emitter ( 3 ) for monitoring the immediate vicinity of the motor vehicle if it determines that the lens transparency is reduced.
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