GB1253994A - Apparatus for detecting and/or measuring the width of strip material - Google Patents

Apparatus for detecting and/or measuring the width of strip material

Info

Publication number
GB1253994A
GB1253994A GB3684168A GB3684168A GB1253994A GB 1253994 A GB1253994 A GB 1253994A GB 3684168 A GB3684168 A GB 3684168A GB 3684168 A GB3684168 A GB 3684168A GB 1253994 A GB1253994 A GB 1253994A
Authority
GB
United Kingdom
Prior art keywords
width
strip
photo
edge
cell
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
GB3684168A
Inventor
Charles Burns
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.)
British Iron and Steel Research Association BISRA
Original Assignee
British Iron and Steel Research Association BISRA
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 British Iron and Steel Research Association BISRA filed Critical British Iron and Steel Research Association BISRA
Priority to GB3684168A priority Critical patent/GB1253994A/en
Publication of GB1253994A publication Critical patent/GB1253994A/en
Expired 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
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G01B11/046—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring width

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

1,253,994. Measuring width photoelectrically. BRITISH IRON & STEEL RESEARCH ASSOCIATION. July 30, 1969 [Aug. 1, 1968], No. 36841/68. Heading G1A. Apparatus for detecting and/or measuring the width of a strip of material comprises means to pass a beam of radiation past both edges of the material so as to be partially obstructed thereby and photo-electric means for detecting the resultant flux density, the path traversed by the beam including two objective lenses positioned on opposite sides of a central stop and two auxiliary lenses positioned with the stop at their focal points. As shown light from a lamp 11 passes through a diffuser 10 and a condenser lens 12 to provide a uniform intensity beam at one edge 13 of a moving strip 5 the width of which is being monitored. That portion of the beam that is not obstructed by this edge falls on a mask D1 in the form of an aperture having parallel edges at right angles to the edge of the strip. The attenuated beam passes through a lens 20, is reflected at a mirror 18 passes through a lens 14 and arrives as a collimated beam at a central stop 22. With the exception of a photo-cell 23 in place of the lamp 11 and diffuser 11 the apparatus is symmetrical about the central stop and the beam continues via lenses 15, 21 and 24, a mirror 19 and a mask D 2 to the photo-cell 23 after further obstruction by the other edge 17 of the strip. The width of the image and thus its flux is proportional to the difference between the distance between the axis of the lenses 20 and 21 and the width of the strip i.e. the output of the photo-cell is inversely proportional to the width of the strip. To cope with strips in slightly different width ranges the source unit 1 and components D1, 14, 18 and 20 may be moved in one direction and the detector unit 3 and components 15, 19 and 21 moved in the other direction. An alternative embodiment which can deal with strips in various width ranges is described. In this embodiment the mirrors 18 and 19 are large and intersect each other. By re-positioning all other path element the path length can be maintained constant.
GB3684168A 1968-08-01 1968-08-01 Apparatus for detecting and/or measuring the width of strip material Expired GB1253994A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3684168A GB1253994A (en) 1968-08-01 1968-08-01 Apparatus for detecting and/or measuring the width of strip material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3684168A GB1253994A (en) 1968-08-01 1968-08-01 Apparatus for detecting and/or measuring the width of strip material

Publications (1)

Publication Number Publication Date
GB1253994A true GB1253994A (en) 1971-11-17

Family

ID=10391614

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3684168A Expired GB1253994A (en) 1968-08-01 1968-08-01 Apparatus for detecting and/or measuring the width of strip material

Country Status (1)

Country Link
GB (1) GB1253994A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655596A (en) * 1983-10-28 1987-04-07 Levi Strauss & Co. Workpiece centering apparatus and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655596A (en) * 1983-10-28 1987-04-07 Levi Strauss & Co. Workpiece centering apparatus and method

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