Method and apparatus for measuring flow

Details Method and apparatus for measuring flow Method and apparatus for measuring flow

1983-04-21

1985-04-02

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

128713, 364510, G01F 170, G01F 168

Patent

active

045079749

ABSTRACT:
Flow, and in particular nonuniform flow, as in a vascular system, is measured by applying a stochastic excitation signal to a system inlet which results in a measurable output signal at a downstream system outlet. Flow rate may be extracted by cross-correlating the excitation signal and the output signal. Calibration may be effected by conservation of mass principles whereby quantity type parameters are related to concentration type parameters. The stochastic signal has the characteristics of white noise, such that simplified spread spectral detection and signal extraction techniques may be employed to recover the desired intelligence.

REFERENCES:
patent: 3214973 (1965-11-01), Lester
patent: 3842670 (1974-10-01), Brain
patent: 4035622 (1977-07-01), Obermajer
patent: 4244026 (1981-01-01), Dickey, Jr.
UK Patent Application, M. Heard, Measuring flow or movement, 9/4/1980, Application No. 8028649.

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