METHOD AND DEVICE FOR DEFORMATION INSPECTION

Title:

METHOD AND DEVICE FOR DEFORMATION INSPECTION

Document Type and Number:

Japanese Patent JP2000039309

Kind Code:

A

Abstract:

To measure mean deformation of a size of about 1 m meshes of a large measured body like a bridge and a tunnel by using an optical fiber grating.

For deformation inspection, a sensor optical fiber 2 of constant length L wherein a grating 3 is built has both its ends 4 fixed to the body 1 to be measured while extended by a constant quantity, variation in the wavelength of a reflection spectrum or transmission and absorption spectrum by the grating 3 is measured, and the extension or shrinkage between both the fixed positions of the measured body 1 is measured as a mean value of lengths L from the variation quantity.

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Inventors:

SASAKI KAZUMASA

Application Number:

JP20536298A

Publication Date:

February 08, 2000

Filing Date:

July 21, 1998

Export Citation:

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Assignee:

SASAKI KAZUMASA
EETEIKKU KK
HOKKAIDO ELECTRIC POWER
SHOWA ELECTRIC WIRE & CABLE CO

International Classes:

G01L1/24; G01B11/16; G02B6/00; (IPC1-7): G01B11/16; G01L1/24; G02B6/00

Attorney, Agent or Firm:

Hiroshi Nirazawa (7 outside)

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