Method and circuit arrangement for the measurement of flow speed

Details Method and circuit arrangement for the measurement of flow speed Method and circuit arrangement for the measurement of flow speed

1996-06-10

1998-09-08

Williams, Hezron E.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386127, G01F 120

Patent

active

058047395

ABSTRACT:
A method of determining the time point (t.sub.0) of the start of a high frequency oscillation packet triggered as a result of a corresponding external excitation which is extremely tolerant relative to systematic disturbances from various sources consists of determining the times at at least two points of the envelope curve of the oscillation packet with respect to an arbitrary zero time point. Of these two points one is a characteristic point of the envelope curve and the other has an amplitude equal to a predetermined fraction of the amplitude at the characteristic envelope curve point.

REFERENCES:
patent: 3914998 (1975-10-01), McShane
patent: 4052896 (1977-10-01), Lee et al.
patent: 4384491 (1983-05-01), Brown et al.
patent: 4417481 (1983-11-01), Krause
patent: 4480485 (1984-11-01), Bradshaw et al.
patent: 4603589 (1986-08-01), Machida
patent: 5035147 (1991-07-01), Woodward
patent: 5052230 (1991-10-01), Lang et al.
patent: 5123286 (1992-06-01), Baumgartner
patent: 5178018 (1993-01-01), Gill
Patent Abstracts of Japan, vol. 007, No. 231 (P-229), Oct. 13, 1983 & JP-A-58 120119 (Kansai Denriyoku KK: Others: 01), Jul. 16, 1983, Abstract.

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