Abstract: A sensor system is described for detecting wetting of a window includes a photodetector having multiple light-sensitive elements and a light source for emitting light to a detection region of the window in such a way that a portion of the light is reflected at the window, and another portion of the light passes through the window. The light source and the light-sensitive element are situated in such a way that a portion of the light from the light source which passes through the window is reflected at the wetting and strikes a portion of the light-sensitive elements. The light source includes a lighting element which is set up to irradiate into a transparent body. The transparent body has a surface which has defined unevennesses for the diffuse radiation of the irradiated light.

Abstract: A camera system for use in a vehicle for simultaneously recognizing rain on its windshield and for monitoring the surroundings, includes: a camera having a camera lens and an image sensor, a mirror system having at least one first mirror and at least one second mirror which are situated in such a way that they define a beam path from a monitored area of the windshield to the first mirror, from there to the second mirror, and from there through the camera lens to a first subarea of the image sensor, the distance along the beam path between the at least one second mirror and the camera lens being smaller than the distance along the beam path between the at least one second mirror and the monitored area.

Abstract: A sensor system is described for detecting wetting of a window includes a photodetector having multiple light-sensitive elements and a light source for emitting light to a detection region of the window in such a way that a portion of the light is reflected at the window, and another portion of the light passes through the window. The light source and the light-sensitive element are situated in such a way that a portion of the light from the light source which passes through the window is reflected at the wetting and strikes a portion of the light-sensitive elements. The light source includes a lighting element which is set up to irradiate into a transparent body. The transparent body has a surface which has defined unevennesses for the diffuse radiation of the irradiated light.

Abstract: A testing device is provided for testing an optical rain sensor which is designed to determine a measure of moisture by determining a reflected portion of a light beam, which testing device has a mounting device for holding the rain sensor and test equipment which is positioned in the light beam, movably, for example, the test equipment having an area which is designed to reflect a predefined portion of the light beam.

Abstract: In an optical sensor for detecting moisture on a windshield of a motor vehicle, in which the light radiation is deflectable to a detection area on the windshield situated in the light path between transmitter and receiver, the transmitter and/or the receiver have a transparent design and are integrated into the windshield. The transparent optical elements may thus be situated in the area of a wiped field of the windshield cleaned by the windshield wiper.

Abstract: The invention relates to a rain sensor, especially for a motor vehicle, said sensor comprising an optical waveguide (22) which can be arranged in a windscreen. According to the invention, the planar holographic coupling elements for coupling and decoupling radiation (4) are formed from layered photo-polymer parts (3) into which volume holograms are integrated. The photo-polymer parts (3) are arranged between the core (1) of the waveguide and the envelope of the waveguide (2), resulting in a simple production method and an increased flexibility in terms of the arrangement of the waveguide (22) in the windscreen.