FLOW RATE MEASURING DEVICE

Title:

FLOW RATE MEASURING DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/074248

Kind Code:

A1

Abstract:

When a flow rate is greater than or equal to a reference flow rate, the reference voltage is changed to a level which can be stably measured, thereby improving the measurement accuracy when the flow rate is high. The reference flow rate and a flow rate value calculated by means of a flow rate calculation means (11) are compared by means of a flow rate determination means (14). By changing the reference voltage value which is set by means of a reference voltage setting means (13) when the calculated flow rate is greater than the reference flow rate, the zero-cross point of a reception waveform can be stably detected in an area in which the influence of the variation in the reception signal amplitude is small. Therefore, it is possible to provide a flow rate measuring device which can stably and precisely measure a flow rate even if the flow rate is high and has disturbances.

Inventors:

GOTOU HIROKAZU
WATANABE AOI
FUJII YUJI
TAKEMURA KOUICHI
NAKABAYASHI YUJI

Application Number:

PCT/JP2010/007260

Publication Date:

June 23, 2011

Filing Date:

December 14, 2010

Export Citation:

Click for automatic bibliography generation Help

Assignee:

PANASONIC CORP (JP)
GOTOU HIROKAZU
WATANABE AOI
FUJII YUJI
TAKEMURA KOUICHI
NAKABAYASHI YUJI

International Classes:

G01F1/66

Foreign References:

JP2003106882A	2003-04-09
JP2004125769A	2004-04-22
JP2003106882A	2003-04-09
JP2009284700A	2009-12-03

Other References: