GB1407409A - Detection of blemishes in a surface - Google Patents

Detection of blemishes in a surface

Info

Publication number
GB1407409A
GB1407409A GB4988571A GB4988571A GB1407409A GB 1407409 A GB1407409 A GB 1407409A GB 4988571 A GB4988571 A GB 4988571A GB 4988571 A GB4988571 A GB 4988571A GB 1407409 A GB1407409 A GB 1407409A
Authority
GB
United Kingdom
Prior art keywords
scanning
travelling
plane
cylindrical lens
negative
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.)
Expired
Application number
GB4988571A
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.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB4988571A priority Critical patent/GB1407409A/en
Priority to NO376672A priority patent/NO131850C/no
Priority to DE19722251915 priority patent/DE2251915A1/en
Priority to US00300568A priority patent/US3804534A/en
Priority to NL7214522A priority patent/NL7214522A/xx
Priority to FR7238172A priority patent/FR2159021A6/fr
Priority to JP10729972A priority patent/JPS4852284A/ja
Publication of GB1407409A publication Critical patent/GB1407409A/en
Expired legal-status Critical Current

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
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • 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
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details

Abstract

1407409 Scanning a surface FERRANTI Ltd 26 Oct 1972 [27 Oct 1971] 49885/71 Addition to 1376135 Heading G1A In a modification of the surface scanning station disclosed in Specification 1376135 the light spot Fig.3a (not shown) scanning the moving surface is elongated to a light bar Fig. 3c (not shown) by utilising an optical arrangement having different focal lengths in two orthogonal planes. The optical system Fig. 4 may comprise two positive spherical lenses 13 and 14 and a negative cylindrical lens 15. The negative cylindrical lens 15 alters (lengthens) the focal length of the system in one plane (parallel to the drawing) so that radiation from the laser 1 travelling in one plane (perpendicular to the drawing) is brought to focus on the surface 6 whilst radiation travelling in an orthogonal plane is brought to focus at 19 behind the surface thereby forming a light bar 20 on the surface, thus enabling the scanning system to operate more effectively with surfaces travelling at high speeds. An alternative optical system Fig. 4c (not shown) employing a positive cylindrical lens instead of the negative lens 15 is disclosed.
GB4988571A 1971-10-27 1971-10-27 Detection of blemishes in a surface Expired GB1407409A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB4988571A GB1407409A (en) 1971-10-27 1971-10-27 Detection of blemishes in a surface
NO376672A NO131850C (en) 1971-10-27 1972-10-19
DE19722251915 DE2251915A1 (en) 1971-10-27 1972-10-23 DEVICE FOR DETECTING SPARKS OR DEFECTS IN A SURFACE
US00300568A US3804534A (en) 1971-10-27 1972-10-25 Detection of blemishes in a surface
NL7214522A NL7214522A (en) 1971-10-27 1972-10-26
FR7238172A FR2159021A6 (en) 1971-10-27 1972-10-27
JP10729972A JPS4852284A (en) 1971-10-27 1972-10-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4988571A GB1407409A (en) 1971-10-27 1971-10-27 Detection of blemishes in a surface

Publications (1)

Publication Number Publication Date
GB1407409A true GB1407409A (en) 1975-09-24

Family

ID=10453892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4988571A Expired GB1407409A (en) 1971-10-27 1971-10-27 Detection of blemishes in a surface

Country Status (6)

Country Link
JP (1) JPS4852284A (en)
DE (1) DE2251915A1 (en)
FR (1) FR2159021A6 (en)
GB (1) GB1407409A (en)
NL (1) NL7214522A (en)
NO (1) NO131850C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2307550A (en) * 1995-11-23 1997-05-28 British Aerospace Illumination of a test sample by scanning a line of coherent radiation
GB2429764A (en) * 2005-08-30 2007-03-07 Imp College Innovations Ltd A scanning device using a first optical system with a first focal length and a second optical system with a second focal length
WO2011005110A1 (en) * 2009-07-08 2011-01-13 Norsk Hydro Asa Method and apparatus for inspection of surfaces

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7502440L (en) * 1974-03-09 1975-09-10 Feldmuehle Anlagen Prod
DE2816986C3 (en) * 1978-04-19 1986-03-27 Agfa-Gevaert Ag, 5090 Leverkusen Arrangement for searching for errors on moving tapes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2307550A (en) * 1995-11-23 1997-05-28 British Aerospace Illumination of a test sample by scanning a line of coherent radiation
GB2429764A (en) * 2005-08-30 2007-03-07 Imp College Innovations Ltd A scanning device using a first optical system with a first focal length and a second optical system with a second focal length
WO2011005110A1 (en) * 2009-07-08 2011-01-13 Norsk Hydro Asa Method and apparatus for inspection of surfaces

Also Published As

Publication number Publication date
NL7214522A (en) 1973-05-02
DE2251915A1 (en) 1973-05-03
JPS4852284A (en) 1973-07-23
FR2159021A6 (en) 1973-06-15
NO131850B (en) 1975-05-05
NO131850C (en) 1975-08-13

Similar Documents

Publication Publication Date Title
JPS5248331A (en) Scanning system with light beam
DE3467447D1 (en) Focussing error detecting apparatus
GB1437346A (en) Optical scanning arrangement
GB1260394A (en) Improvements in or relating to optical lens systems
GB1451885A (en) Image rotating optical system
GB1028353A (en) A zoom lens
GB1407409A (en) Detection of blemishes in a surface
GB1035990A (en) Optical system focussing device
SE321880B (en)
GB1093066A (en) Improvements in or relating to lens assemblies and mounts therefor
JPS5722218A (en) Scanning optical system using plural beams
JPS52119331A (en) Laser recording device
GB1152019A (en) Optical Systems
GB1329726A (en) Optical scanning arrangement
GB1290021A (en)
GB1201781A (en) A zoom lens of high zoom ratio
JPS5317705A (en) Automatic focusing system
GB1334754A (en) Optical scanning apparatus
JPS5397447A (en) Optical scanning system
GB1311921A (en) Directional light transmitting screens
GB1318804A (en) Optical scanning devices
GB1376135A (en) Detection of blemishes in surfaces
GB882650A (en) Improvements in or relating to television cameras that include optical arrangements comprising a zoom lens
GB964177A (en) Improvements relating to optical projection systems
GB1329864A (en) Automatic focussing devic3

Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed