DEVICE TO DETECT DISTANCE TRAVELLED BY GROUND VEHICLE Russian patent published in 2015 - IPC G01C22/02 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of instrument making and may find application in systems to detect travelled path of ground vehicles. A mechanical speed sensor and an optoelectronic speed sensor are interconnected. In process of vehicle motion they measure time of delay in reception of signals by light-sensitive elements of the optoelectronic sensor that are reflected from irregularities of road surface, as they are illuminated with a mini-projector of a moving object. At the same time the optoelectronic speed sensor estimates not the entire combination of pulses arriving from its sensitive elements, but just specific pulses released into predicted intervals of time with the help of the mechanical speed sensor. With this purpose the device includes the following: a trigger, a logical element, a generator, a pulse counter, a calculator and an integrating device.

EFFECT: increased accuracy compared to systems, where for travelled path measurement they use only a mechanical travel sensor.

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