Velocity detecting apparatus

Details Velocity detecting apparatus Velocity detecting apparatus

1979-09-04

1981-03-24

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

324160, 364510, G01F 170, G01P 518

Patent

active

042572754

ABSTRACT:
Noise signals from a relatively moving object, such as those caused by eddies in a fluid or by protrusions and recesses or gradation on the surface of paper or an iron plate, are sensed at two or more points spaced in the direction of the motion. A difference signal is then obtained from the resulting two noise signals. The relative velocity of the object is detected from the difference signal by utilizing the autocorrelation function or the frequency spectrum of the difference signal.

REFERENCES:
patent: 3762221 (1973-10-01), Coulthard
patent: 3813939 (1974-06-01), Head
patent: 3844170 (1974-10-01), Critten
patent: 4019038 (1977-04-01), Critten et al.
Fisher et al., "The Crossed Beam Correlation Technique", U. Fluid Mech., 1967, vol. 28, part 4, pp. 705-717.

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