TERTIARY MODE OSCILLATORY CORIOLIS FLOWMETER

Title:

TERTIARY MODE OSCILLATORY CORIOLIS FLOWMETER

Document Type and Number:

WIPO Patent Application WO/2005/090930

Kind Code:

A1

Abstract:

In order that a flow tube (3) of a Coriolis flowmeter (1) may be oscillated in the tertiary mode using one driver (4), the driver (4) is arranged at the antinode (H2) in the center of tertiary mode oscillation, and oscillation sensors (5, 5) are arranged at two antinodes (H1, H3) other than the antinode (H2) in the center of tertiary mode oscillation. Furthermore, the displacement polarity of the driver (4) is opposite to those of the oscillation sensors (5, 5), so that the oscillation phases of the flow tube (3) are in a relation of mutually opposite phases. Furthermore, in the positive feedback loop of the exciting circuit section (9) for exciting tertiary mode oscillation of the flow tube (3) and the oscillation sensors (5, 5), the exciting circuit section (9) is structured so that the relation between the displacement polarities where the oscillation phases of the flow tube (3) are opposite to one another is changed to the relation where the oscillation phases of the flow tube (3) are in phase.

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Inventors:

NAKAO YUICHI (JP)
KOBAYASHI SEIJI (JP)
SUKEMURA NORIO (JP)

Application Number:

PCT/JP2004/014449

Publication Date:

September 29, 2005

Filing Date:

September 24, 2004

Export Citation:

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Assignee:

OVAL CORP (JP)
NAKAO YUICHI (JP)
KOBAYASHI SEIJI (JP)
SUKEMURA NORIO (JP)

International Classes:

G01F1/84; (IPC1-7): G01F1/84

Foreign References:

JP3058074B2	2000-07-04
JP2000018994A	2000-01-21

Other References: