METHOD AND DEVICE FOR INSPECTING UNDER RAILROAD BED

Title:

METHOD AND DEVICE FOR INSPECTING UNDER RAILROAD BED

Document Type and Number:

Japanese Patent JP2003107169

Kind Code:

A

Abstract:

To detect the existence of a cavity under a railroad bed by an underground radar system.

An array antenna 34 in which a sending antenna element array 18 and a receiving antenna element array 28 are arranged along a railroad track is moved on the track. The work of emitting a radio wave under the railroad bed while switching a plurality of sending antenna elements 18i per transfer unit of the array antenna 34 and switching reception between a plurality of receiving antenna elements 20i per transmission from respective sending antenna elements is repeated. A cavity is detected by generating pulse echo data of parameters of time and a traveling direction and send and receive distances of the array antenna 34 and generating a two-dimensional image of a cross section under the railroad bed.

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Inventors:

KIMURA NORIAKI
DOI KYOJI
MORI YASUNARI

Application Number:

JP2001302485A

Publication Date:

April 09, 2003

Filing Date:

September 28, 2001

Export Citation:

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Assignee:

MITSUI SHIPBUILDING ENG

International Classes:

E01B35/00; G01S13/88; G01V3/12; (IPC1-7): G01V3/12; E01B35/00; G01S13/88

Domestic Patent References:

JPH07134174A	1995-05-23
JPH0988351A	1997-03-31
JPH1048347A	1998-02-20
JP2001183469A	2001-07-06
JPH0587918A	1993-04-09

Attorney, Agent or Firm:

Yuichi Murakami (1 outside)

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