Process and device for the contact free determination of the...

G - Physics – 01 – P

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340/148.2

G01P 13/00 (2006.01) G01P 3/36 (2006.01) G01P 13/04 (2006.01)

Patent

CA 1246184

ABSTRACT OF THE DISCLOSURE An image of a moving object with an optically dif- ferentiatable structure is projected onto a grid of opto-electric transducers through a lens. The output signals of at least one square group of four transducers A - D are processed to produce from output signals of the respective transducers a pair of signals I = A + B - C - D and II = B + C - A - D. The nature of the object is such as to cause periodically varying signals in the transducers, and there are thus concerned two signals shifted by a quarter period, from which the direction of movement can be determined by means of a logic circuit. From the frequency of the signals the velocity can be ascertained. By means of direction dependent counters the path of the object can be deter- mined from the signals. With a two dimensional matrix of transducers measurements can be effected of movement of the object in different directions. The measurement is simple and offers versatile possibilities of exploita- tion.

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