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1. (WO2010073002) DISTRIBUTED OPTICAL FIBRE SENSOR
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2010/073002 International Application No.: PCT/GB2009/002928
Publication Date: 01.07.2010 International Filing Date: 22.12.2009
IPC:
G01D 5/34 (2006.01) ,G01D 5/353 (2006.01)
G PHYSICS
01
MEASURING; TESTING
D
MEASURING 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
5
Mechanical 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
26
using optical means, i.e. using infra-red, visible or ultra-violet light
32
with attenuation or whole or partial obturation of beams of light
34
the beams of light being detected by photocells
G PHYSICS
01
MEASURING; TESTING
D
MEASURING 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
5
Mechanical 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
26
using optical means, i.e. using infra-red, visible or ultra-violet light
32
with attenuation or whole or partial obturation of beams of light
34
the beams of light being detected by photocells
353
influencing the transmission properties of an optical fibre
Applicants:
FOTECH SOLUTIONS LIMITED [GB/GB]; Condor House 10 St Paul's Churchyard London EC4M 8AL, GB (AllExceptUS)
ROGERS, Alan, John [GB/GB]; GB (UsOnly)
Inventors:
ROGERS, Alan, John; GB
Agent:
PALMER, Jonathan, Richard; BOULT WADE TENNANT Verulam Gardens 70 Gray's Inn Road London WC1X 8BT, GB
Priority Data:
0823306.622.12.2008GB
Title (EN) DISTRIBUTED OPTICAL FIBRE SENSOR
(FR) CAPTEUR DE FIBRE OPTIQUE RÉPARTI
Abstract:
(EN) A distributed optical fibre sensor is described. The sensor uses a sensor fibre (10) having a low or zero intrinsic birefringence that is responsive to an environmental parameter (24) such as pressure. Probe light pulses having a diversity of launch polarisation states are used to reduce signal fading and polarisation dependent loss in the retardation beat frequency signals which are sensed (20) and then analysed (22) to determine the environmental parameter as a profile along the sensor fibre.
(FR) L'invention concerne un capteur de fibre optique réparti. Le capteur utilise une fibre de détection (10) comportant une biréfringence intrinsèque nulle ou faible qui est sensible à un paramètre environnemental (24) tel qu'une pression. Les impulsions de lumière sonde dotées d'une diversité d'états de polarisation d'attaque sont utilisées pour réduire l'affaiblissement de signal et la perte dépendant de la polarisation dans les signaux de fréquence de battement de retard qui sont détectés (20) et ensuite analysés (22) pour déterminer le paramètre environnemental en tant que profil le long de la fibre de détection.
front page image
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP2373956US20110255077