EP 1620697 A2 20060201 - UNIAXIAL THERMAL AND/OR MECHANICAL DEFORMATION-MEASURING DEVICE, SYSTEM AND METHOD EMPLOYING A BRAGG GRATING OPTICAL FIBRE
Title (en)
UNIAXIAL THERMAL AND/OR MECHANICAL DEFORMATION-MEASURING DEVICE, SYSTEM AND METHOD EMPLOYING A BRAGG GRATING OPTICAL FIBRE
Title (de)
VORRICHTUNG,SYSTEM UND VERFAHREN ZUM MESSEN VON UNIAXIALEN MECHANISCHEN UND/ODER THERMISCHEN DEFORMATIONEN MITTELS EINES MIT EINEM BRAGG GITTER VERSEHENEN OPTISCHEN FASERS
Title (fr)
DISPOSITIF, SYSTEME ET PROCEDE DE MESURE DE DEFORMATIONS MECANIQUES ET/OU THERMIQUES UNIAXIALES AU MOYEN D UNE FIBRE OPTIQUE A RESEAU DE BRAGG
Publication
Application
Priority
- FR 2004001130 W 20040507
- FR 0305584 A 20030507
Abstract (en)
[origin: WO2004099713A2] The invention relates to a uniaxial deformation-measuring device consisting of: a section of optical fibre comprising at least one Bragg grating which is aligned with the direction of the measurement axis; and a test body which is subjected to the deformations to be measured and which transmits same to the section of optical fibre. The inventive device is characterised in that: (i) fixing points, which are designed to subject the fibre section to a negative, positive or zero preload and to transmit the elongations experienced in the test body thereto, are separated by a distance (Lfib) presenting a variation (<Lfib) when the test body is stressed by the deformation to be measured; (ii) the effective length (Lce) of the test body presents an elongation (?Lce) when the test body is stressed by the deformation to be measured; and the length (Lfib) of the section of optical fibre and the effective length (Lce) of the measurement body are such that the longitudinal deformation (?Lfib/Lfib) experienced by the section of optical fibre is strictly greater than the originating deformation (?Lce/Lce) of the test body, thereby defining an amplification factor K which is strictly greater than 1 and which is equal to the quotient (?Lfib/Lfib) /(?Lce/Lce) at the first order.
IPC 1-7
IPC 8 full level
G01B 11/16 (2006.01); G01D 5/353 (2006.01); G01L 1/24 (2006.01)
CPC (source: EP KR US)
G01B 11/16 (2013.01 - KR); G01B 11/165 (2013.01 - EP US); G01B 11/18 (2013.01 - EP); G01D 5/26 (2013.01 - KR); G01D 5/35303 (2013.01 - EP US); G01D 5/35316 (2013.01 - EP); G01D 5/35341 (2013.01 - EP); G01K 5/50 (2013.01 - KR); G01L 1/24 (2013.01 - KR); G01L 1/246 (2013.01 - EP US)
Citation (search report)
See references of WO 2004099713A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
FR 2854689 A1 20041112; FR 2854689 B1 20050902; EP 1620697 A2 20060201; JP 2006525501 A 20061109; KR 20060014042 A 20060214; US 2007107529 A1 20070517; US 7406877 B2 20080805; WO 2004099713 A2 20041118; WO 2004099713 A3 20050519
DOCDB simple family (application)
FR 0305584 A 20030507; EP 04742687 A 20040507; FR 2004001130 W 20040507; JP 2006505838 A 20040507; KR 20057021105 A 20051107; US 55563004 A 20040507