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1. (WO2001030615) SENSOR FOR DETECTING HUMIDITY DROPS AND/OR DIRT PARTICLES ON A GLASS SURFACE AND A METHOD FOR OPERATING SUCH A SENSOR

Pub. No.:    WO/2001/030615    International Application No.:    PCT/EP2000/008230
Publication Date: Fri May 04 01:59:59 CEST 2001 International Filing Date: Thu Aug 24 01:59:59 CEST 2000
IPC: B60S 1/08
Applicants: VALEO AUTO-ELECTRIC WISCHER UND MOTOREN GMBH
BAYHA, Heiner
OSTERFELD, Martin
Inventors: BAYHA, Heiner
OSTERFELD, Martin
Title: SENSOR FOR DETECTING HUMIDITY DROPS AND/OR DIRT PARTICLES ON A GLASS SURFACE AND A METHOD FOR OPERATING SUCH A SENSOR
Abstract:
The invention relates to a sensor (1) for detecting humidity drops (7) and/or dirt particles (8) on a glass surface (2), especially a windscreen of a motor vehicle. The sensor (1) is provided with at least one emitting element (3) for emitting optical beams (4) onto the glass surface. The sensor is also provided with at least one receiving element (10) for receiving at least a portion of the beams (9) which are reflected by the humidity drops (7) and/or the dirt particles (8) and for generating a receiving signal (11) which depends upon the received beams (9). The sensor is further provided with evaluation means for evaluating the receiving signal (11). The invention also relates to a method for operating such a sensor (1). The aim of the invention is to reduce fabrication costs for such a sensor (1) and to enable digitalisation of the receiving signal (11) of the sensor (1) with a sufficiently high resolution and dynamic. The or each emitting element (3) emits optical beams (4) in a temporally successive manner, whereby said beams have different intensities. The evaluation means allocate the intensities of the emitted optical beams to the receiving signal (11). The intensities are considered during evaluation of the receiving signal (11).