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1. WO2011072927 - DEVICE AND METHOD FOR RAPIDLY MEASURING ELONGATION

Publication Number WO/2011/072927
Publication Date 23.06.2011
International Application No. PCT/EP2010/066087
International Filing Date 25.10.2010
IPC
G01L 1/24 2006.01
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
1Measuring force or stress, in general
24by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
G01D 5/353 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
26using optical means, i.e. using infra-red, visible or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
353influencing the transmission properties of an optical fibre
G01M 11/00 2006.01
GPHYSICS
01MEASURING; TESTING
MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
11Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
G01M 11/08 2006.01
GPHYSICS
01MEASURING; TESTING
MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
11Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
08Testing mechanical properties
CPC
G01D 5/35367
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
26characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
353influencing the transmission properties of an optical fibre
35338using other arrangements than interferometer arrangements
35354Sensor working in reflection
35367using reflected light other than backscattered to detect the measured quantity
G01L 1/242
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
1Measuring force or stress, in general
24by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis ; using infra-red, visible light, ultra-violet
242the material being an optical fibre
Applicants
  • BUNDESANSTALT FÜR MATERIALFORSCHUNG UND -PRÜFUNG (BAM) [DE]/[DE] (AllExceptUS)
  • LIEHR, Sascha [DE]/[DE] (UsOnly)
Inventors
  • LIEHR, Sascha
Agents
  • ZIMMERMANN, Gerd
Priority Data
10 2009 058 520.616.12.2009DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VORRICHTUNG UND VERFAHREN ZUR SCHNELLEN DEHNUNGSMESSUNG
(EN) DEVICE AND METHOD FOR RAPIDLY MEASURING ELONGATION
(FR) DISPOSITIF ET PROCÉDÉ DE MESURAGE D'ALLONGEMENT RAPIDE
Abstract
(DE)
Ein Verfahren zur Dehnungsmessung an einer Sensorfaser umfaß die Schritte: (a) Bereitstellen mindestens einer Sensorfaser, die an n vorbestimmten Positionen (zr) jeweils eine Reflektionsstelle aufweist, wobei n ≥ 1 ist; (b) Bereitstellen einer Referenzübertragungsfunktion (H0, Hr) der Sensorfaser, wobei die Referenzübertragungsfunktion (H0, Hr) in einem vorbestimmten Ausgangszustand der Sensorfaser ermittelt wurde; (c) Durchführen von m ≥ n optischen Frequenzbereichsreflektometrie-Messungen bei m voneinander verschiedenen Meßfrequenzen (fk) zur Ermittlung von m Meßübertragungsfunktionen (Mk); (d) Ermitteln einer örtlichen Verschiebung (Δzr) mindestens einer Reflektionsstelle anhand der Referenzübertragungsfunktion (H0, Hr) und der Meßübertragungsfunktionen (Mk); und (e) Ermitteln der Dehnung eines zu der mindestens einen Reflektionsstelle benachbarten Abschnitts der Sensorfaser anhand der ermittelten örtlichen Verschiebung (Δzr) der Reflektionsstelle.
(EN)
The invention relates to a method for measuring elongation on a sensor fiber, comprising the steps: (a) providing at least one sensor fiber having a reflection point each at n predetermined positions (zr), where n ≥ 1; (b) providing a reference transmission function (H0, Hr) of the sensor fiber, wherein the reference transmission function (H0, Hr) was determined in a predetermined initial state of the sensor fiber; (c) performing of m ≥ n optical frequency range reflectometry measurements at m measurement frequencies (fk) which differ from each other to determine m measurement transmission functions (Mk); (d) determining a local shift (Δzr) of at least one reflection point on the basis of the reference transmission function (H0, Hr) and the measurement transmission functions (Mk); and (e) determining the elongation of a section of the sensor fiber adjacent to the at least one reflection point on the basis of the determined local shift (Δzr) of the reflection point.
(FR)
L'invention concerne un procédé de mesurage d'allongement sur une fibre de capteur qui comprend les étapes suivantes : (a) préparation d'au moins une fibre de capteur, qui présente un point de réflexion sur chacune des n positions (zr) prédéterminées, sachant que n est ≥ 1 ; (b) préparation d'une fonction de transmission de référence (H0, Hr) de la fibre de capteur, la fonction de transmission de référence (H0, Hr) ayant été déterminée dans un état initial prédéfini de la fibre de capteur ; (c) mise en œuvre de m ≥ n mesures optiques de réflectométrie de plage de fréquences avec m fréquences de mesure (fk) différentes les unes des autres pour la détermination de m fonctions de transmission de mesure (Mk) ; (d) détermination d'un déplacement local (Δzr) d'au moins un point de réflexion à l'aide de la fonction de transmission de référence (H0, Hr) et des fonctions de transmission de mesure (Mk) ; et (e) détermination de l'allongement d'un tronçon, voisin du au moins un point de réflexion, de la fibre de capteur à l'aide du déplacement local déterminé (Δzr) du point de réflexion.
Also published as
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