CA2185572A1 - Image processing method for determining the structural strength of a test object with a diffuse-scattering surface - Google Patents

Image processing method for determining the structural strength of a test object with a diffuse-scattering surface

Info

Publication number
CA2185572A1
CA2185572A1 CA002185572A CA2185572A CA2185572A1 CA 2185572 A1 CA2185572 A1 CA 2185572A1 CA 002185572 A CA002185572 A CA 002185572A CA 2185572 A CA2185572 A CA 2185572A CA 2185572 A1 CA2185572 A1 CA 2185572A1
Authority
CA
Canada
Prior art keywords
image
test object
grey scale
scale value
diffuse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002185572A
Other languages
French (fr)
Other versions
CA2185572C (en
Inventor
Hans Rottenkolber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NOVA CORD AG
Original Assignee
Hans Rottenkolber
Nova C.O.R.D. Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hans Rottenkolber, Nova C.O.R.D. Ag filed Critical Hans Rottenkolber
Publication of CA2185572A1 publication Critical patent/CA2185572A1/en
Application granted granted Critical
Publication of CA2185572C publication Critical patent/CA2185572C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
    • G01B11/162—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by speckle- or shearing interferometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/02—Tyres
    • G01M17/027—Tyres using light, e.g. infrared, ultraviolet or holographic techniques

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Image Processing (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The proposed image-processing method for determining the structural strength of a test object with a diffuse-scattering surface involves: the creation of an interferogram based on radiation back-scattered by the surface of the test object; conversion of the interferogram into a modulo-2.pi. image; and the stabilisation of the modulo-2.pi. image to form an output grey scale value image. From the latter, an identical duplicate grey scale value image is produced; this is then geometrically shifted and modified by applying an invariable grey scale value in the entire image area, before being finally subtracted from the initial grey scale value image to produce a grey scale image containing easily evaluated information on deformities in the observed test object.
CA002185572A 1995-01-16 1996-01-15 Image processing method for determining the structural strength of a test object with a diffuse-scattering surface Expired - Fee Related CA2185572C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19501073.6 1995-01-16
DE19501073A DE19501073A1 (en) 1995-01-16 1995-01-16 Image processing method for determining the structural strength of a test object with a diffusely scattering surface
PCT/EP1996/000187 WO1996022507A1 (en) 1995-01-16 1996-01-15 Image processing method for determining the structural strength of a test object with a diffuse-scattering surface

Publications (2)

Publication Number Publication Date
CA2185572A1 true CA2185572A1 (en) 1996-07-25
CA2185572C CA2185572C (en) 2002-09-03

Family

ID=7751568

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002185572A Expired - Fee Related CA2185572C (en) 1995-01-16 1996-01-15 Image processing method for determining the structural strength of a test object with a diffuse-scattering surface

Country Status (7)

Country Link
US (1) US5760888A (en)
EP (1) EP0750735B1 (en)
AT (1) ATE182004T1 (en)
AU (1) AU4537296A (en)
CA (1) CA2185572C (en)
DE (2) DE19501073A1 (en)
WO (1) WO1996022507A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11510380A (en) * 1995-07-17 1999-09-14 ボード オブ リージェンツ，ザ ユニバーシティ オブ テキサス システム p16 expression constructs and their application in cancer therapy
DE59609853D1 (en) * 1996-08-06 2002-12-12 Nova C O R D Ag Schaan Procedure for determining tire defects
ATE308027T1 (en) * 1997-06-10 2005-11-15 Beissbarth Gmbh METHOD AND DEVICE FOR TESTING TIRES
DE19731486C2 (en) * 1997-07-22 2001-02-22 Beissbarth Gmbh Tire testing device
EP0955533A3 (en) * 1998-05-07 2000-02-02 Nova C.O.R.D. Ag Procedure for testing the structural strenght of tyres, preferably of lorry tyres
DE19859725C2 (en) * 1998-12-23 2001-02-22 Stefan Dengler Device for determining deformations on an object surface, in particular a diffusely scattering object surface, and use of the device
DE19859801C2 (en) 1998-12-23 2001-08-30 Bernward Maehner Method for real-time determination and display of deformations or displacements of test objects and device for carrying out the method
DE19906681C2 (en) 1999-02-18 2002-01-24 Bernward Maehner Method for determining structural features, in particular structural defects, on test objects with a diffusely scattering surface
DE19922775A1 (en) * 1999-05-18 2000-11-23 Beissbarth Gmbh Tire inspection procedure
US7187437B2 (en) * 2003-09-10 2007-03-06 Shearographics, Llc Plurality of light sources for inspection apparatus and method
US7436504B2 (en) * 2003-09-10 2008-10-14 Shear Graphics, Llc Non-destructive testing and imaging
US6934018B2 (en) * 2003-09-10 2005-08-23 Shearographics, Llc Tire inspection apparatus and method
US9988242B1 (en) 2017-01-11 2018-06-05 Otis Elevator Company Elevator rail healthy monitoring method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5065331A (en) * 1981-05-18 1991-11-12 Vachon Reginald I Apparatus and method for determining the stress and strain in pipes, pressure vessels, structural members and other deformable bodies
US4591996A (en) * 1981-05-18 1986-05-27 Vachon Reginald I Apparatus and method for determining stress and strain in pipes, pressure vessels, structural members and other deformable bodies
US5011280A (en) * 1987-12-07 1991-04-30 Hung Yau Y Method of measuring displacement between points on a test object
US5020904A (en) * 1989-09-06 1991-06-04 Mcmahan Jr Robert K Dynamic laser speckle profilometer and method
US5091776A (en) * 1990-11-08 1992-02-25 Laser Technology, Inc. Apparatus and method for enhancing the quality of a video signal produced by electronic shearography
US5146289A (en) * 1990-12-21 1992-09-08 Laser Technology, Inc. Nondestructive testing using air-coupled acoustic excitation
DE4231578C2 (en) * 1992-09-21 1995-06-29 Nova C O R D Ag Method for determining deformations on a test object with a diffusely scattering surface, in particular on tires, and device for carrying out the method
US5481356A (en) * 1994-04-25 1996-01-02 Northwestern University Apparatus and method for nondestructive testing using additive-subtractive phase-modulated interferometry

Also Published As

Publication number Publication date
AU4537296A (en) 1996-08-07
US5760888A (en) 1998-06-02
EP0750735B1 (en) 1999-07-07
DE59602371D1 (en) 1999-08-12
DE19501073A1 (en) 1996-08-01
ATE182004T1 (en) 1999-07-15
WO1996022507A1 (en) 1996-07-25
CA2185572C (en) 2002-09-03
EP0750735A1 (en) 1997-01-02

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