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1. WO1996017224 - DIAGNOSTIC SYSTEM FOR FIBER GRATING SENSORS

Publication Number WO/1996/017224
Publication Date 06.06.1996
International Application No. PCT/US1994/013628
International Filing Date 28.11.1994
Chapter 2 Demand Filed 27.06.1996
IPC
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
CPC
G01D 5/35312
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
35306using an interferometer arrangement
35309using multiple waves interferometer
35312using a Fabry Perot
G01D 5/35335
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
35306using an interferometer arrangement
35335Aspects of emitters or receivers used by an interferometer in an optical fibre sensor arrangement
Applicants
  • UNITED TECHNOLOGIES CORPORATION [US]/[US]
Inventors
  • DUNPHY, James, R.
  • FALKOWICH, Kenneth, P.
Agents
  • HIRSCH, Peter
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIAGNOSTIC SYSTEM FOR FIBER GRATING SENSORS
(FR) SYSTEME DE DIAGNOSTIC DESTINE A DES CAPTEURS A RESEAUX DE FIBRES
Abstract
(EN)
An optical sensor diagnostic system includes a tunable narrow wavelength-band source (9) which provides a variable wavelength light (44) into an optical fiber (32, 52). Reflective sensors (54, 58), such as Bragg gratings, are disposed along the fiber (52) in the path of the variable light (44). The sensors (54, 58) transmit light (56, 60) having a minimum transmission wavelength which varies due to a perturbation, such as strain, imposed thereon. A tuner control circuit (42) drives the tunable light source (9) to cause the source light (44) to scan across a predetermined wavelength range to illuminate each sensor at its minimum transmission wavelength. The power of the transmitted light is converted to an electrical signal by a detector (64) and monitored by a signal processor (68) which detects drops in transmitted power level and provides output signals on lines (71) indicative of the perturbation for each sensor. The system may be configured in open loop mode to measure static strains, or closed loop mode to track static strains and measure dynamic strains. Also, the system may be used in a Fabry-Perot configuration to provide a very sensitive strain detection system. Further, the system may be configured in reflection or transmission mode.
(FR)
Système de diagnostic pour capteur optique comprenant une source (9) de bande de longueur d'onde étroite réglable qui envoie de la lumière (44) de longueur d'onde variable dans une fibre optique (32, 52). Des capteurs réfléchissants (54, 58) tels que des réseaux de Bragg sont disposés le long de la fibre (52) sur le chemin de la lumière variable (44). Les capteurs (54, 58) transmettent la lumière (56, 60) dont la longueur d'onde de transmission minimum varie en raison d'une perturbation telle que la contrainte qu'elle subit. Un circuit (42) de commande du syntonisateur excite la source (9) de lumière réglable de sorte que la lumière (44) de la source balaie une plage de longueur d'onde prédéterminée pour éclairer chaque capteur à sa longueur d'onde de transmission minimum. La puissance de la lumière transmise est convertie en un signal électrique par un détecteur (64) et surveillée par un processeur (68) de signal qui détecte les éventuelles baisses du niveau de puissance transmises et envoie des signaux de sortie sur les lignes (71) qui indiquent la perturbation subie par chaque capteur. Ce système peut être configuré suivant un mode à boucle ouverte pour mesurer les contraintes statiques ou suivant un mode à boucle fermée pour rechercher les contraintes statiques et mesurer les contraintes dynamiques. Ce système peut également être utilisé dans une configuration de Fabry-Perot pour constituer alors un système très sensible de détection des contraintes; il peut, en outre, être configuré suivant un mode de réflexion ou de transmission.
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