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1. (WO2001033184) METHOD OF MEASURING THE TWIST IMPARTED TO AN OPTICAL FIBRE AND PROCEDURE FOR PROCESSING AN OPTICAL FIBRE USING THIS METHOD
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2001/033184 International Application No.: PCT/EP2000/010248
Publication Date: 10.05.2001 International Filing Date: 18.10.2000
Chapter 2 Demand Filed: 14.05.2001
IPC:
C03B 37/025 (2006.01) ,C03B 37/027 (2006.01) ,G01B 5/10 (2006.01) ,G01B 7/12 (2006.01) ,G01B 21/12 (2006.01) ,G01M 11/00 (2006.01) ,G02B 6/10 (2006.01)
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
B
MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
37
Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
01
Manufacture of glass fibres or filaments
02
by drawing or extruding
025
from reheated softened tubes, rods, fibres or filaments
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
B
MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
37
Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
01
Manufacture of glass fibres or filaments
02
by drawing or extruding
025
from reheated softened tubes, rods, fibres or filaments
027
Fibres composed of different sorts of glass, e.g. fibre optics
G PHYSICS
01
MEASURING; TESTING
B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
5
Measuring arrangements characterised by the use of mechanical means
08
for measuring diameters
10
of objects while moving
G PHYSICS
01
MEASURING; TESTING
B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
7
Measuring arrangements characterised by the use of electric or magnetic means
12
for measuring diameters
G PHYSICS
01
MEASURING; TESTING
B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
21
Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the other groups of this subclass
10
for measuring diameters
12
of objects while moving
G PHYSICS
01
MEASURING; TESTING
M
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
11
Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6
Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
10
of the optical waveguide type
Applicants:
COCCHINI, Franco [IT/IT]; IT (UsOnly)
RICCO, Arturo [IT/IT]; IT (UsOnly)
PIRELLI CAVI E SISTEMI S.P.A. [IT/IT]; Viale Sarca, 222 I-20126 Milano, IT (AllExceptUS)
Inventors:
COCCHINI, Franco; IT
RICCO, Arturo; IT
Agent:
PIRELLI CAVI E SISTEMI S.P.A.; Viale Sarca, 222 I-20126 Milan, IT
BATTIPEDE, Francesco; Pirelli S.p.A. Industrial Property Dept. Viale Sarca, 222 I-20126 Milano, IT
Common
Representative:
PIRELLI CAVI E SISTEMI S.P.A.; Viale Sarca, 222 I-20126 Milan, IT
Priority Data:
60/163,57005.11.1999US
99121543.529.10.1999EP
Title (EN) METHOD OF MEASURING THE TWIST IMPARTED TO AN OPTICAL FIBRE AND PROCEDURE FOR PROCESSING AN OPTICAL FIBRE USING THIS METHOD
(FR) PROCEDE DE MESURE DE LA TORSION TRANSMISE A UNE FIBRE OPTIQUE ET PROCEDURE DE TRAITEMENT D'UNE FIBRE OPTIQUE UTILISANT CE PROCEDE
Abstract:
(EN) A method of measuring the twist imparted to an optical fibre comprises the steps of advancing the optical fibre in a predetermined direction and at a predetermined velocity, imparting to the optical fibre, during the step of advancing, a twist about its axis, measuring the diameter of the optical fibre (210) during the step of advancing, to generate a time-based signal indicating the diameter, and processing this signal to find a value indicating the imparted twist. The step of processing comprises the principal steps of transforming in the frequency domain (240) the signal relating to the measurement of the diameter, calculating the power spectrum (250) of the signal thus obtained, distinguishing in this power spectrum the signal peaks correlated with the imparted twist (270), determining the maximum frequency (280) associated with these signal peaks, and dividing the value of this maximum frequency by the value of the velocity of advance of the fibre to find the value indicating the imparted twist (290).
(FR) L'invention concerne un procédé de mesure de la torsion transmise à une fibre optique consistant à avancer ladite fibre dans une direction déterminée à une vitesse déterminée, à transmettre à la fibre optique, lors de l'avancée, une torsion autour de son axe, à mesurer le diamètre de la fibre optique (210) lors de l'avancée, à générer un signal temporel indiquant ce diamètre, et à traiter ce signal afin de trouver une valeur indicative de la torsion transmise. L'étape de traitement comprend les étapes principales consistant à transformer dans le domaine fréquentiel (240) le signal relatif à la mesure du diamètre, à calculer le spectre de puissance (250) du signal ainsi obtenu, à distinguer dans ce spectre les crêtes du signal en corrélation avec la torsion appliquée (270), à déterminer la fréquence maximale (280) associée auxdites crêtes et à diviser la valeur de la fréquence maximale par la valeur de la vitesse d'avancement de la fibre, et ce afin de déterminer la valeur indiquant la torsion appliquée (290).
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (EPO) (AT, BE, CH, CY, 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, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)