Transducer and method for measuring a fluid flowing in a pipe

Details Transducer and method for measuring a fluid flowing in a pipe Transducer and method for measuring a fluid flowing in a pipe

2005-04-19

2005-04-19

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

Reexamination Certificate

active

06880410

ABSTRACT:
The transducer serves to generate a measurement signal corresponding to at least one physical parameter of a fluid flowing in a pipe. It comprises a flow tube of predeterminable lumen for conducting the fluid which communicates with the pipe at the inlet and outlet ends. In operation, an excitation assembly causes reactions, particularly reaction forces, in the fluid within the at least one flow tube in a non-invasive manner, which are sensed and converted into measurement signals representative thereof by means of a sensor arrangement. To obtain as axisymmetric a density distribution in the fluid as possible, means are provided in an inlet area of the transducer or at least in the vicinity thereof which cause a swirl in the entering fluid and, thus, a rotational motion in the fluid within the flow-tube lumen about an axis of rotation lying in the direction of fluid flow. As a result of the axisymmetric density distribution thus produced, the transducer provides accurate and robust measurement signals even in the case of inhomogeneous, particularly multiphase, fluids, and substantially independently of the mounting position of the flow tube.

REFERENCES:
patent: 4420983 (1983-12-01), Langdon
patent: 5458005 (1995-10-01), Perelshteyn
patent: 6318156 (2001-11-01), Dutton et al.
patent: 6487917 (2002-12-01), Van Cleve et al.
Patent Abstracts of Japan, vol. 1997, No. 06, Jun. 30, 1997, JP 09053969, Oscillatory Measuring Apparatus.
Patent Abstracts of Japan, vol. 1999, No. 01, Jan. 29, 1999, JP 10281846, Polyphase Flowmeter by Pattern Recognition Method . . . Flowmeter.

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