FLOW MEASURING INSTRUMENT OF FLUID - MATSUSHITA ELECTRIC IND CO LTD

Title:

FLOW MEASURING INSTRUMENT OF FLUID

Document Type and Number:

WIPO Patent Application WO/2007/020843

Kind Code:

A1

Abstract:

A measurement control section (4) for controlling operation of measurement, by a time measuring section (11), of the propagation time of ultrasonic wave operates based on a high rate clock supplied from a ceramic oscillation circuit (16) during time measuring operation. Every time when time measuring operation by the time measuring section ends, a clock control section (18) stops the high rate clock supplied from the ceramic oscillation circuit (16), and the clock control section (18) controls a waiting time, by a low rate clock supplied from a quartz oscillation circuit (15), after the end of measurement of propagation time until the start of the next measurement.

Inventors:

TAKEMURA KOICHI
BESSYO DAISUKE
SHIBA FUMIKAZU
NAKABAYASHI YUJI

Application Number:

PCT/JP2006/315707

Publication Date:

February 22, 2007

Filing Date:

August 09, 2006

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)
TAKEMURA KOICHI
BESSYO DAISUKE
SHIBA FUMIKAZU
NAKABAYASHI YUJI

International Classes:

G01F1/66

Foreign References:

JPH09133562A	1997-05-20
JPH09304139A	1997-11-28
JP2003315124A	2003-11-06
JP2002350202A	2002-12-04
JP2001289681A	2001-10-19

Other References: