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1. WO1990013004 - OPTICAL FIBRE SENSOR SYSTEM

Publication Number WO/1990/013004
Publication Date 01.11.1990
International Application No. PCT/GB1990/000656
International Filing Date 24.04.1990
Chapter 2 Demand Filed 26.11.1990
IPC
G01D 5/26 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
CPC
G01D 5/268
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
268using optical fibres
Applicants
  • UNICON HOLDINGS LIMITED [GB]/[GB] (AllExceptUS)
  • SENIOR, John, Michael [GB]/[GB] (UsOnly)
  • MURTAZA, Ghulam [GB]/[GB] (UsOnly)
Inventors
  • SENIOR, John, Michael
  • MURTAZA, Ghulam
Agents
  • ALLMAN, Peter, John
Priority Data
8909593.926.04.1989GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL FIBRE SENSOR SYSTEM
(FR) SYSTEME DE DETECTION A FIBRES OPTIQUES
Abstract
(EN)
An optical fibre sensor system comprising a transmitter, a receiver and a sensor interconnected by an optical link. An optical source at the transmitter transmits to the sensor via the optical link two optical signals at different wavelengths. The sensor transmits to the receiver via the optical link measurement and reference signals, the measurement signal being derived by modulating the intensity of one of the two optical signals in dependence upon a parameter monitored by the sensor and the reference signal having an intensity which has a predetermined relationship with the intensity of the other optical signal. The receiver compares the intensities of the measurement and reference signals to derive a measure of the monitored parameter. The two wavelengths are selected such that changes in the intensities of the optical signals resulting from variations in the temperature of the optical source are minimised or are of substantially equal magnitude for both the optical signals.
(FR)
Système de détection à fibres optiques comprenant un émetteur, un récepteur, et un détecteur interconnectés par une liaison optique. Une source optique de l'émetteur envoie au détecteur, par l'intermédiaire de la liaison optique, deux signaux optiques sur des longueurs d'ondes différentes. Le détecteur transmet au récepteur, au moyen des signaux de mesure et de référence envoyés par liaison optique, le signal de mesure provenant de la modulation de l'intensité d'un des deux signaux optiques en fonction d'un paramètre contrôlé par le détecteur, ainsi que le signal de référence possédant une intensité en rapport prédéterminé avec l'intensité de l'autre signal optique. Le récepteur compare les intensités desdits signaux de mesure et de référence afin de déterminer la valeur du paramètre contrôlé. Les deux longueurs d'onde sont sélectionnées de sorte que les modifications d'intensité des signaux optiques résultant de variations de température de la source optique soient minmalisées ou d'une grandeur essentiellement égale dans le cas des deux signaux optiques.
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