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1. WO1987007365 - APPARATUS AND METHOD FOR DETERMINING STRESS AND STRAIN IN PIPES, PRESSURE VESSELS, STRUCTURAL MEMBERS AND OTHER DEFORMABLE BODIES

Publication Number WO/1987/007365
Publication Date 03.12.1987
International Application No. PCT/US1986/001124
International Filing Date 23.05.1986
Chapter 2 Demand Filed 22.01.1988
IPC
G01B 11/16 2006.1
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11Measuring arrangements characterised by the use of optical means
16for measuring the deformation in a solid, e.g. optical strain gauge
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
CPC
G01B 11/164
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11Measuring arrangements characterised by the use of optical means
16for measuring the deformation in a solid, e.g. optical strain gauge
161by interferometric means
164by holographic interferometry
G01L 1/24
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
Applicants
  • VACHON, Reginald, I. [US]/[US]
  • RANSON, William, F. [US]/[US]
Inventors
  • VACHON, Reginald, I.
  • RANSON, William, F.
Agents
  • JACOBSON, Harvey, B. @
Priority Data
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) APPARATUS AND METHOD FOR DETERMINING STRESS AND STRAIN IN PIPES, PRESSURE VESSELS, STRUCTURAL MEMBERS AND OTHER DEFORMABLE BODIES
(FR) APPAREIL ET PROCEDE PERMETTANT DE DETERMINER LA CONTRAINTE ET LA DEFORMATION DANS DES CONDUITES, DES ENCEINTES SOUS PRESSION, DES ELEMENTS DE STRUCTURE ET AUTRES CORPS DEFORMABLES
Abstract
(EN) A method and apparatus for measuring stress and strain associated with a pipe, pressurized vessel (12), structural member or deformable body containing a flaw or stress concentration utilizes a laser beam (18) to illuminate a surface (14) being analyzed and an optical data digitizer (20) to sense a signal provided by a speckle pattern produced by the light beam reflected from the illuminated surface. One signal is received from the surface (14) in a reference condition and subsequent signals are received from the surface (14) after surface deformation. The optical data digitizer (20) provides the received signal to an image processor (98), and the processor stores the signals and correlates the deformed image received with the reference image and then sends this correlated information to a minicomputer (28) which performs mathematical analyses of the signal to determine stress and strain associated with the surface. The apparatus is constructed as one integral unit (34), and further includes a digital and tape display (30), as well as a television monitor (26) and an electro-optic range indicator (23).
(FR) Un procédé et un appareil, permettant de mesurer la contrainte et la déformation associées à une conduite, une enceinte sous pression (12), un élément de structure ou un corps déformable présentant une concentration de défauts ou de contraintes, utilisent un rayon laser (18) destiné à éclairer une surface (14) en cours d'analyse et un numériseur de données optiques (20) servant à détecter un signal produit par une structure en pointillés formée par le rayon lumineux réfléchi depuis la surface éclairée. Un seul signal est capté depuis la surface (14) dans des conditions de référence et des signaux ultérieurs sont captés depuis la surface (14) après déformation de la surface. Le numériseur de données optiques (20) envoie le signal capté à un processeur d'image (98), lequel enregistre les signaux et met en rapport l'image déformée captée avec l'image de référence, puis envoie ces informations mises en rapport à un mini-ordinateur (28) qui effectue des analyses mathématiques du signal, afin de déterminer la contrainte et la déformation associées avec la surface. L'appareil est construit en une seule pièce (34) et comprend en outre un affichage numérique et à bande (30) ainsi qu'un écran de contrôle TV (26) et un indicateur de distances électro-optique (23).
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