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1. (WO1997015805) STRAIN GAUGE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015805 International Application No.: PCT/GB1996/002606
Publication Date: 01.05.1997 International Filing Date: 24.10.1996
Chapter 2 Demand Filed: 25.04.1997
IPC:
G01B 11/16 (2006.01) ,G01L 1/24 (2006.01)
G PHYSICS
01
MEASURING; TESTING
B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11
Measuring arrangements characterised by the use of optical means
16
for measuring the deformation in a solid, e.g. optical strain gauge
G PHYSICS
01
MEASURING; TESTING
L
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
1
Measuring force or stress, in general
24
by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
Applicants:
BICC PUBLIC LIMITED COMPANY [GB/GB]; Devonshire House Mayfair Place London W1X 5FH, GB (AllExceptUS)
HAIGH, Neil, Richard [GB/GB]; GB (UsOnly)
ROWLAND, Simon, Mark [GB/GB]; GB (UsOnly)
LINTON, Richard, Stephen [GB/GB]; GB (UsOnly)
Inventors:
HAIGH, Neil, Richard; GB
ROWLAND, Simon, Mark; GB
LINTON, Richard, Stephen; GB
Agent:
DLUGOSZ, Anthony, Charles; BICC Public Limited Company Patents & Licensing Dept. Quantum House, Maylands Avenue Hemel Hempstead Hertfordshire HP2 4SJ, GB
Priority Data:
9521957.226.10.1995GB
Title (EN) STRAIN GAUGE
(FR) JAUGE DE CONTRAINTE
Abstract:
(EN) An optical fibre strain gauge (1) for an engineering structure e.g. a bridge, building, pipe, plant or the like, comprises: (a) a plurality of supports (8, 10) for the optical fibre that can be located on a surface of the structure and are spaced apart from one another over a part of the surface; and (b) at least one optical fibre (12) that is looped around the supports so that it extends between the supports, the optical fibre being fixed to the supports so that the length of the part of the fibre extending between the supports will vary in accordance with strain of the surface of the structure. The optical fibre(s) (12) can be looped around the supports (8, 10) a number of times, which enables the fibre(s) to be held more easily, and enables the strain gauge to incorporate a length of fibre significantly greater than the dimension of the area of the structure that is being monitored. The fibre(s) will normally contain reflectors such as Bragg gratings to enable signals to be monitored.
(FR) Une jauge de contrainte (1) à fibres optiques destinée à un ouvrage d'art tel qu'un pont, un immeuble, une canalisation, une installation ou similaire, comporte: (a) une pluralité de supports (8, 10) destinés à la fibre optique, lesquels peuvent être situés sur une surface de la structure et sont espacés les uns des autres sur une partie de cette surface; et (b) au moins une fibre optique enroulée autour des supports de manière à s'étendre entre ces derniers, la fibre optique étant fixe par rapport aux supports de sorte que la longueur de la partie de la fibre s'étendant entre lesdits supports va varier en fonction de la contrainte de la surface de la structure. La ou les fibres optiques (12) peuvent être enroulées autour des supports (8, 10) un certain nombre de fois, ce qui permet un maintien plus aisé des fibres, et permet à la jauge d'intégrer une longueur de fibre notablement supérieure à la dimension de la surface de la structure contrôlée. La ou les fibres comportent normalement des réflecteurs tels que des réseaux de Bragg permettant le contrôle des signaux.
Designated States: AL, AM, AT, AU, AZ, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0857291JPH11513806 CA2235482AU1996073175