FLOW RATE MEASUREMENT DEVICE

Title:

FLOW RATE MEASUREMENT DEVICE

Document Type and Number:

WIPO Patent Application WO/2010/079568

Kind Code:

A1

Abstract:

Disclosed is a flow rate measurement device, comprising a time differential memory unit (17b), which stores a time differential of a propagation time of an ultrasonic signal in a forward and a reverse direction that is measured in a unit measurement process, while switching a transmission and reception direction in a forward and a reverse direction of two oscillation elements (2, 3) when carrying out each respective K iterations of the unit measurement process that measures the propagation time in the forward and the reverse direction thereof, a flow rate computation unit (15), which derives a pass-through flow rate of a liquid body, based on a sum of the propagation time in the forward and the reverse direction of the unit measurement process that is carried out not less than K iterations thereof, and an estimation unit (18), which estimates an instantaneous change in the flow rate of the liquid body based on the time differential for each of the K iterations of the unit measurement process that is stored upon the time differential memory unit (17b), thereby facilitating a detection of the instantaneous change of the flow rate while deriving an accurate pass-through flow rate.

Inventors:

TAKEMURA KOICHI
SHIBA FUMIKAZU
BESSHO DAISUKE

Application Number:

PCT/JP2009/007231

Publication Date:

July 15, 2010

Filing Date:

December 25, 2009

Export Citation:

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Assignee:

PANASONIC CORP (JP)
TAKEMURA KOICHI
SHIBA FUMIKAZU
BESSHO DAISUKE

International Classes:

G01F1/66; G01F3/22

Foreign References:

JP2004144744A	2004-05-20
JP2004069522A	2004-03-04
JP2004069532A	2004-03-04
JP2000146648A	2000-05-26
JP2002035202A	2002-02-05

Other References: