SE8200712L - SET AND DEVICE FOR SURFACE DETECTIONS - Google Patents

SET AND DEVICE FOR SURFACE DETECTIONS

Info

Publication number
SE8200712L
SE8200712L SE8200712A SE8200712A SE8200712L SE 8200712 L SE8200712 L SE 8200712L SE 8200712 A SE8200712 A SE 8200712A SE 8200712 A SE8200712 A SE 8200712A SE 8200712 L SE8200712 L SE 8200712L
Authority
SE
Sweden
Prior art keywords
light
photosensitive layer
defects
spatial distribution
image
Prior art date
Application number
SE8200712A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE448030B (en
Inventor
E Milana
Original Assignee
Fiat Ricerche
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 Fiat Ricerche filed Critical Fiat Ricerche
Publication of SE8200712L publication Critical patent/SE8200712L/en
Publication of SE448030B publication Critical patent/SE448030B/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The detection of surface defects in mechanical parts is effected by the analysis of diffracted light coming from these defects. The detection method includes the steps of illuminating the surface (S) of the part to be examined with incoherent light and forming a flat image of the said surface in a transparent photosensitive layer of a spatial light modulator (14). The spatial distribution of the intensity of the incoherent light reflected by the said surface (S) produces a corresponding and proportional spatial distribution of values of refractive index in the photosensitive layer. This layer is illuminated with plane polarized, coherent light by frame scanning in elementary areas. During the scanning operation, the variations in at least one of the polarization components of the coherent light are detected by a matrix of converters (42) after the light has traversed the said transparent photosensitive layer. <IMAGE>
SE8200712A 1981-02-10 1982-02-08 SET AND DEVICE FOR SURFACE DETECTIONS SE448030B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67187/81A IT1143380B (en) 1981-02-10 1981-02-10 PROCEDURE AND DEVICE FOR THE DETECTION OF SURFACE DEFECTS OF MECHANICAL PARTS, IN PARTICULAR OF PARTS WITH CURVED SURFACE

Publications (2)

Publication Number Publication Date
SE8200712L true SE8200712L (en) 1982-08-11
SE448030B SE448030B (en) 1987-01-12

Family

ID=11300313

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8200712A SE448030B (en) 1981-02-10 1982-02-08 SET AND DEVICE FOR SURFACE DETECTIONS

Country Status (6)

Country Link
CA (1) CA1179036A (en)
DE (2) DE8203330U1 (en)
FR (1) FR2499718A1 (en)
GB (1) GB2095398B (en)
IT (1) IT1143380B (en)
SE (1) SE448030B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58219441A (en) * 1982-06-15 1983-12-20 Hajime Sangyo Kk Apparatus for detecting defect on surface of convex object
GB2133871A (en) * 1982-12-23 1984-08-01 Austin Rover Group Apparatus for a method of inspecting automotive components
US4920385A (en) * 1984-02-14 1990-04-24 Diffracto Ltd. Panel surface flaw inspection
US4629319A (en) * 1984-02-14 1986-12-16 Diffracto Ltd. Panel surface flaw inspection
GB2159271B (en) * 1984-04-27 1988-05-18 Nissan Motor Surface flaw detecting method and apparatus
US5206700A (en) * 1985-03-14 1993-04-27 Diffracto, Ltd. Methods and apparatus for retroreflective surface inspection and distortion measurement
JPH0682102B2 (en) * 1987-02-27 1994-10-19 三菱電機株式会社 Pattern defect inspection device and pattern defect inspection method
US5168322A (en) * 1991-08-19 1992-12-01 Diffracto Ltd. Surface inspection using retro-reflective light field
US5225890A (en) * 1991-10-28 1993-07-06 Gencorp Inc. Surface inspection apparatus and method
DE4219691A1 (en) * 1992-06-16 1993-12-23 Siemens Ag Measuring device for determining direction of polarisation planes of linearly polarised light - has stepper motor with hollow axle, drive circuit with motor positioning accuracy correction stage, analyser and electro-optical detector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2311287A1 (en) * 1975-05-12 1976-12-10 Bertin & Cie Wave motion measuring optical instrument - has laser and light transformer to determine energy spectrum by Fourier transform

Also Published As

Publication number Publication date
SE448030B (en) 1987-01-12
CA1179036A (en) 1984-12-04
DE3204295A1 (en) 1982-08-19
DE8203330U1 (en) 1985-05-23
IT8167187A0 (en) 1981-02-10
FR2499718A1 (en) 1982-08-13
IT1143380B (en) 1986-10-22
FR2499718B1 (en) 1985-04-26
GB2095398B (en) 1984-08-08
GB2095398A (en) 1982-09-29

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