Clamp-on type ultrasonic flow meter and a temperature and pressu

Details Clamp-on type ultrasonic flow meter and a temperature and pressu Clamp-on type ultrasonic flow meter and a temperature and pressu

1996-03-19

1999-01-05

Biegel, Ronald L.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

364510, G01F 100

Patent

active

058566228

ABSTRACT:
A ratio C of sonic speed in a fluid to a sinusoidal value at an incident angle of sonic waves from the pipe to the fluid is designated as a basic unknown quantity. A distance D between the opposite inner wall surfaces of the pipe, a thickness t.sub.p of the pipe wall, a projection length t.sub.w of sound rays in the oblique wedge projected onto a plane orthogonal to the center axis of the pipe, and sonic speed C.sub.w, C.sub.p in the oblique wedge and the pipe wall are used as given values. A propagation time .tau. of ultrasonic waves through the oblique wedge and the pipe wall is treated as a variable. The value C is determined in course of calculating a projection length L of sound rays between the ultrasonic transducers projected onto the center axis of the pipe by a gradual approximation, which is determined as a given value. Then, a refraction angle .theta..sub.f of sonic waves from the pipe wall to the fluid and a propagation time .tau. of ultrasonic waves through the oblique wedge of the ultrasonic transducer are determined based on the value C. These values and a propagation time of ultrasonic waves between the ultrasonic transducers obtained by a measurement are applied to a basic equation to derive a flow velocity of the fluid in the pipe at temperature and pressure under a service condition.

REFERENCES:
patent: 5152174 (1992-10-01), LaBuddle
patent: 5280728 (1994-01-01), Sato et al.
patent: 5442592 (1995-08-01), Toda et al.
patent: 5546813 (1996-08-01), Hastings et al.

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