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Title:
LEAK INSPECTION DEVICE, LEAK INSPECTION METHOD, AND LEAK INSPECTION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2014/050358
Kind Code:
A1
Abstract:
Each functional configuring unit of this leak inspection device (2000) operates in the manner that follows. A vibration acquisition unit (2020) acquires a signal indicating tubing vibrations or vibrations propagated from tubing. A filtering unit (2040) extracts a signal of a predetermined frequency band from the signal acquired by the vibration acquisition unit (2020). A characteristic value extraction unit (2060) splits the signal extracted by the filtering unit (2040) into predetermined time intervals, calculates for each split signal the absolute value of each extreme value of the magnitude of the signal, performs for each split signal a statistical process with respect to the calculated plurality of absolute values, and considers values calculated by the statistical process to be characteristic values. Also, a leak determination unit (2080) considers inspection results to indicate the presence of a leak when a determination index value stipulated using the characteristic values is greater than a predetermined threshold.

Inventors:
SHINODA SHIGEKI (JP)
SASAKI YASUHIRO (JP)
TAKAHASHI MASATAKE (JP)
MATAGA JUNICHIRO (JP)
TAKATA SOICHIRO (JP)
Application Number:
PCT/JP2013/072100
Publication Date:
April 03, 2014
Filing Date:
August 19, 2013
Export Citation:
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Assignee:
NEC CORP (JP)
International Classes:
G01M3/24
Foreign References:
JP2006349572A2006-12-28
JPS6370138A1988-03-30
JP2009002873A2009-01-08
JPS6255540A1987-03-11
JP2012037492A2012-02-23
JPH1172409A1999-03-16
JP2006317172A2006-11-24
JP2012214811A2012-11-08
Other References:
See also references of EP 2902765A4
Attorney, Agent or Firm:
HAYAMI SHINJI (JP)
Shinji Hayami (JP)
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