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1. WO1999002953 - FIBER OPTIC PRESSURE TRANSDUCERS AND PRESSURE SENSING SYSTEM INCORPORATING SAME

Publication Number WO/1999/002953
Publication Date 21.01.1999
International Application No. PCT/US1998/013912
International Filing Date 02.07.1998
Chapter 2 Demand Filed 04.02.1999
IPC
G01L 1/24 2006.1
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
G01L 11/02 2006.1
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
11Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/ or G01L9/175
02by optical means
CPC
G01D 3/036
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
3Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
028mitigating undesired influences, e.g. temperature, pressure
036on measuring arrangements themselves
G01D 5/344
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
344using polarisation
G01D 5/35316
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
35316using a Bragg gratings
G01L 1/246
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
246using integrated gratings, e.g. Bragg gratings
G01L 11/025
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
11Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
02by optical means
025using a pressure-sensitive optical fibre
Applicants
  • SCHLUMBERGER LIMITED [NL]/[US] (GB, TR)
  • SCHLUMBERGER CANADA LIMITED [CA]/[CA] (CA)
  • SCHLUMBERGER TECHNOLOGY B.V. [NL]/[NL] (AL, AM, AT, AU, AZ, BA, BB, BG, BY, CH, CU, CY, CZ, DE, DK, EE, ES, FI, GE, GM, GR, HR, HU, ID, IE, IL, IS, IT, KG, KP, KZ, LS, LU, MC, MD, MG, MK, MN, MW, NL, NO, NZ, PL, PT, RO, RU, SE, SI, SK, SL, SZ, TJ, TM, TT, UA, UG, UZ, VN, YU, ZW)
  • SERVICES PETROLIERS SCHLUMBERGER [FR]/[FR] (FR)
  • SCHLUMBERGER HOLDINGS LIMITED [--]/[--] (BE, GH, JP, KE, SD, SG)
  • SCHLUMBERGER OVERSEAS S.A. [PA]/[PA] (CN)
  • PETROLEUM RESEARCH AND DEVELOPMENT N.V. [NL]/[NL] (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
  • SCHLUMBERGER SURENCO, S.A. [PA]/[VE] (BR, MX)
Inventors
  • SCHROEDER, Robert, J.
  • UDD, Eric
Agents
  • SMITH, Keith
  • HAGEL, Francis
Priority Data
08/888,56607.07.1997US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) FIBER OPTIC PRESSURE TRANSDUCERS AND PRESSURE SENSING SYSTEM INCORPORATING SAME
(FR) TRANSDUCTEURS DE PRESSION A FIBRE OPTIQUE ET SYSTEME DE CAPTAGE DE PRESSION DANS LEQUEL ILS SONT INCORPORES
Abstract
(EN) A fiber optic pressure transducer having enhanced resolution and dynamic range includes a fiber optic core having one or more gratings written onto it, a birefringence structure for enhancing the birefringence of the core, and a structure for converting isotropic pressure forces to anisotropic forces on the fiber core. Several different embodiments of prestressing structure are disclosed (both extrinsic and intrinsic). Several different embodiments of structure (both extrinsic and intrinsic) for converting isotropi c pressure to anisotropic pressure are also disclosed. The fiber optic pressure transducer according to the invention is advantageously used in conjunction with a light source and a spectral demodulation system in order to detect pressure ambient to the fiber optic pressure transducer based on the wavelength and shift of spectral peaks.
(FR) La présente invention concerne un transducteur de pression à fibre optique présentant une résolution et une plage dynamique améliorées et comprenant: une âme de fibre optique sur laquelle sont formés un ou plusieurs réseaux de diffraction; une structure biréfringente permettant d'accentuer la biréfringence de l'âme; et une structure permettant de convertir en forces anisotropes les forces de pression isotropes s'exerçant sur l'âme de la fibre. L'invention se rapporte à plusieurs modes de réalisation différents d'une structure de précontrainte (à la fois extrinsèque et intrinsèque), ainsi qu'à plusieurs modes de réalisation différents d'une structure (à la fois extrinsèque et intrinsèque) permettant de convertir la pression isotrope en pression anisotrope. Le transducteur de pression à fibre optique de la présente invention peut avantageusement être utilisé en combinaison avec une source de lumière et un système de démodulation spectrale afin de détecter la pression ambiante du transducteur de pression à fibre optique sur la base de la longueur d'onde et du décalage des crêtes spectrales.
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