FLAW DETECTION SYSTEM - NIPPON SIGNAL CO LTD

Title:

FLAW DETECTION SYSTEM

Document Type and Number:

WIPO Patent Application WO/2002/021120

Kind Code:

A1

Abstract:

A flaw detection system that uses a simple network configuration to find such a break as in a railway rail. A detector unit (20, 50), relay units (30A, 30B, 60A-60C) and a terminal unit (40, 70) are arranged along a rail (11, 11A, 11B). An ultrasonic signal transmitted from the detector unit (20, 50) through the rail (11, 11A, 11B) is relayed by the relay units (30A, 30B, 60A-60C) and passed to the terminal unit (40, 70). The ultrasonic signal received by the terminal unit (40, 70) is returned to the detector unit (20, 50) through the relay units (30A, 30B, 60A-60C), and it is determined whether any break exists in the rail (11, 11A, 11B) based on the state of reception of the ultrasonic signal at the detector unit (20, 50).

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Inventors:

SAKAI MASAYOSHI (JP)
SHIRAI TOSHIHITO (JP)
MORISADA AKIRA (JP)

Application Number:

PCT/JP2000/008549

Publication Date:

March 14, 2002

Filing Date:

December 01, 2000

Export Citation:

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Assignee:

NIPPON SIGNAL CO LTD (JP)
SAKAI MASAYOSHI (JP)
SHIRAI TOSHIHITO (JP)
MORISADA AKIRA (JP)

International Classes:

B61K9/10; B61L23/04; G01N29/04; G01N29/07; G01N29/32; G01N29/36; G01N29/38; G10K11/24; (IPC1-7): G01N29/10

Domestic Patent References:

WO1998007610A1	1998-02-26
WO1999066320A2	1999-12-23

Foreign References:

US5743495A	1998-04-28
JPS56128542U	1981-09-30

Other References: