METHOD FOR SCANNING OPTICAL MEASUREMENT OF THE SPEED OF AN OBJECT

摘要

Method for scanning optical measurement of the speed of an object. The invention relates to the field of measurement technology, in particular to optical measurement devices for measuring the speed of, for example, a car equipped with a measurement device relative to a road. The invention is based on the generation of spatial amplitude modulation of the light reflected from the object with the aid of a raster positioned between an optical system and photodetectors and the detection of the modulated light with the aid of at least four photodetectors and at least three differential amplifiers, with the frequency of the resultant output electrical signal from said differential amplifiers being used as a basis for a judgement on the speed of the object. The characterizing feature of the invention consists in the high degree of measurement accuracy and reliability even in the case of zero-contrast and poorly reflective surfaces.