The invention relates to a method for the determination of physical properties of flows or currents using at least one sensor head, wherein fluctuations of a parameter are detected by at least three sensor heads, said detected fluctuations of a parameter are converted into measuring signals. A time of flight between a first pair of sensor heads of said at least three sensor heads is determined from correlating said measuring signals created by the two measuring signals of said first pair of sensor heads. Then, a quotient of a distance between said pair of sensor heads and said time of flight is evaluated, a time of flight, a distance and a quotient are evaluated for a second pair of sensor heads of said at least three sensor heads, and from the quotients evaluated for the two pairs of sensor heads, a two dimensional velocity is calculated.