OPTOELECTRONIC SENSOR DEVICE
First Claim
1. Optoelectronic sensor device (08) arranged for recording of soiling on a cover (09) transparent for electromagnetic waves of a certain wavelength range, with at least one light source (12, 13) that emits at least two light beams (10, 11), a test surface (15) arranged in cover (09), having a concave surface (14) exposed to environmental effects, through which the light beams (10, 11) emerge and reenter, as well as at least one receiver (16, 17) that measures the radiation powers of the light beams (10, 11), on which the light beams (10, 11) are imaged independently of each other after reentry in an unsoiled surface (14), characterized by the factthat the test surface (15) has at least two areas (18, 19) with different microstructurings, in which a first microstructuring is designed, so that a liquid applied to the area (18) provided with the first microstructuring is held together drop-like, and a second microstructuring is designed, so that a liquid applied to the area (19) provided with the second microstructuring is distributed film-like, in which case, in the unsoiled state of surface (14), at least a first light beam (10) emerges and reenters through the first area (18) and at least a second light beam (11) emerges and reenters through the second area (19), so that a conclusion can be drawn concerning the transparency of the cover (09) exposed to soiling by evaluation of the radiation powers.
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Accused Products
Abstract
An optoelectronic sensor device is described for recording of soiling on a transparent cover, with at least one light source that emits at least two light beams, a test surface arranged in the cover, having a concave surface exposed to environmental effects, through which the light beams emerge and reenter, as well as at least one receiver that measure the radiation powers of the light beams, on which the light beams are imaged independently of each other after reentry. The test surface has at least two areas with different microstructurings, in which a first microstructuring is designed, so that a liquid applied to the area provided with the first microstructuring is held together drop-like, and a second microstructuring is designed, so that a liquid applied to the area provided with the second microstructuring is distributed film-like, in which at least a first light beam emerges and reenters through the first area and at least a second light beam emerges and reenters through the second area, so that by comparison of the radiation powers of the two light beams, a conclusion can be drawn concerning the transparency of the cover exposed to soiling. In addition a method is described for determination of the transparency of soiling by a transparent surface exposed to environmental effects.
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Citations
15 Claims
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1. Optoelectronic sensor device (08) arranged for recording of soiling on a cover (09) transparent for electromagnetic waves of a certain wavelength range, with at least one light source (12, 13) that emits at least two light beams (10, 11), a test surface (15) arranged in cover (09), having a concave surface (14) exposed to environmental effects, through which the light beams (10, 11) emerge and reenter, as well as at least one receiver (16, 17) that measures the radiation powers of the light beams (10, 11), on which the light beams (10, 11) are imaged independently of each other after reentry in an unsoiled surface (14), characterized by the fact
that the test surface (15) has at least two areas (18, 19) with different microstructurings, in which a first microstructuring is designed, so that a liquid applied to the area (18) provided with the first microstructuring is held together drop-like, and a second microstructuring is designed, so that a liquid applied to the area (19) provided with the second microstructuring is distributed film-like, in which case, in the unsoiled state of surface (14), at least a first light beam (10) emerges and reenters through the first area (18) and at least a second light beam (11) emerges and reenters through the second area (19), so that a conclusion can be drawn concerning the transparency of the cover (09) exposed to soiling by evaluation of the radiation powers.
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13. Method for determination of transparency of soiling by a surface (14) exposed to environmental effects, transparent for electromagnetic waves of a certain wavelength range, characterized by the process steps:
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Arrangement of at least two areas (18, 19) provided with different microstructurings on surface (14), in which a first microstructuring is designed, so that a liquid applied to the area (18) provided with the first microstructuring is held together drop-like, and a second microstructuring is designed, so that a liquid applied to the area (19) provided with the second microstructuring is distributed to a liquid film, Generation of at least two light beams (10, 11), at least a first one of which emerges and reenters through the first area, and at least a second of which emerges and reenters through the second area in the unsoiled state of surface (14), Measurement of the radiation powers of the light beams (10, 11) independently of each other, as well as Evaluation of the radiation powers of the two light beams (10, 11), in which the result of evaluation is an unsoiled surface (14), if, for both light beams (10, 11) an essentially unchanged radiation power is measured relative to an assigned start value and the result of the evaluation is a surface (14) wetted by a transparent liquid, if, for the first light beam (10), a reduced radiation power is measured relative to the assigned start value and, for the second light beam (11), a higher radiation power relative to the assigned start value is measured. - View Dependent Claims (14, 15)
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Specification