Title:
STRAIN AND AE MEASUREMENT DEVICE USING OPTICAL FIBER SENSOR
Document Type and Number:
WIPO Patent Application WO/2004/113830
Kind Code:
A1
Abstract:
A strain and AE measurement device includes an FBG (Fiber Bragg Grating) sensor, a wide band light source, a coupler for branching reflected light transmitted from the FBG sensor, a strain measurement filter for reflecting or transmitting the reflected light branched by the coupler, and a filter for detecting AE (acoustic emission, elastic wave emission). The strain measurement filter and the AE detection filter have different transmittances corresponding to two types of wavelength. The light passing through or reflected by the strain measurement filter and the AE detection filter changes its intensity according to the change of the Bragg wavelength. The intensity change is converted into an electric signal by a photo-electric converter so as to detect a strain change as well as AE accompanying generation of a fine damage in the material/structure.
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Inventors:
TSUDA HIROSHI (JP)
Application Number:
PCT/JP2004/008315
Publication Date:
December 29, 2004
Filing Date:
June 14, 2004
Export Citation:
Assignee:
NAT INST OF ADVANCED IND SCIEN (JP)
TSUDA HIROSHI (JP)
TSUDA HIROSHI (JP)
International Classes:
G01B11/16; G01B17/04; G01D5/353; G01L1/24; G01N29/14; (IPC1-7): G01B11/16
Foreign References:
| US6256090B1 | 2001-07-03 | |||
| US5319435A | 1994-06-07 | |||
| JP2001508535A | 2001-06-26 |
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