Optoelectronic sensor device for the detection of the degree of wetting of the transparent screen of a motor vehicle with precipitation
First Claim
1. An optoelectronic sensor for detecting wetness on a transparent windshield, the sensor comprising:
- a beam guide having first and second parallel boundary surfaces, an entrance coupling surface, and an exit coupling surface, the coupling surfaces positioned at opposite ends of the beam guide and slanted relative to the beam guide, the first boundary surface cooperating by way of an optical coupling medium with the windshield and the second coupling surface cooperating with the entrance and exit coupling surfaces;
an optical transmitter having a narrow band operating range optically coupled to the entrance coupling surface, the transmitter defining a first end of an optical beam path;
an optical receiver having a narrow band operating range optically coupled to the exit coupling surface, the receiver defining a second end of the optical beam path;
a first filter incorporated into the beam path having an associated first pass range; and
a second filter incorporated into the beam path having an associated second pass range, wherein the first and second pass ranges overlap within the narrow band operating range of the transmitter and the receiver.
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Abstract
An optoelectronic sensor device for the detection of the degree of wetting of a transparent vehicle screen with precipitation, includes a beam guide with two opposing parallel surfaces and two surfaces which lie opposite to one another and which are angled in opposing fashion through which beams enter and exit, one of the parallel surfaces being coupled to the vehicle screen in an optical fashion, the beam entry surface cooperating with an optical transmitter and the exit surface cooperating with an optical receiver. The device limits the wavelength of rays which exit from the beam guide to the operating range of the beam transmitter. Two filters (4) are incorporated in the beam path whose pass ranges overlap within a narrow frequency band.
36 Citations
15 Claims
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1. An optoelectronic sensor for detecting wetness on a transparent windshield, the sensor comprising:
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a beam guide having first and second parallel boundary surfaces, an entrance coupling surface, and an exit coupling surface, the coupling surfaces positioned at opposite ends of the beam guide and slanted relative to the beam guide, the first boundary surface cooperating by way of an optical coupling medium with the windshield and the second coupling surface cooperating with the entrance and exit coupling surfaces; an optical transmitter having a narrow band operating range optically coupled to the entrance coupling surface, the transmitter defining a first end of an optical beam path; an optical receiver having a narrow band operating range optically coupled to the exit coupling surface, the receiver defining a second end of the optical beam path; a first filter incorporated into the beam path having an associated first pass range; and a second filter incorporated into the beam path having an associated second pass range, wherein the first and second pass ranges overlap within the narrow band operating range of the transmitter and the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An optoelectronic sensor for detecting wetness on a transparent windshield, the sensor comprising:
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a beam guide having first and second parallel boundary surfaces, an entrance coupling surface, and an exit coupling surface, the coupling surfaces positioned at opposite ends of the beam guide and slanted relative to the beam guide, the first boundary surface cooperating by way of an optical coupling medium with the windshield and the second coupling surface cooperating with the entrance and exit coupling surfaces, the beam guide also having an associated optical first pass range; an optical transmitter having a narrow band operating range optically coupled to the entrance coupling surface, the transmitter defining a first end of an optical beam path; an optical receiver having a narrow band operating range optically coupled to the exit coupling surface, the receiver defining a second end of the optical beam path; a filter incorporated into the optical beam path having an associated second pass range wherein the second pass range overlaps with the first pass range within the narrow band operating range of the transmitter and the receiver.
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Specification