GB1399256A - Method and apparatus for detecting the passing of a straight contrast boundary - Google Patents

Method and apparatus for detecting the passing of a straight contrast boundary

Info

Publication number
GB1399256A
GB1399256A GB4736572A GB4736572A GB1399256A GB 1399256 A GB1399256 A GB 1399256A GB 4736572 A GB4736572 A GB 4736572A GB 4736572 A GB4736572 A GB 4736572A GB 1399256 A GB1399256 A GB 1399256A
Authority
GB
United Kingdom
Prior art keywords
transition
outputs
photo
amplifier
detector
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
GB4736572A
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19712152732 external-priority patent/DE2152732C3/en
Application filed by Individual filed Critical Individual
Publication of GB1399256A publication Critical patent/GB1399256A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • 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
    • G01B11/028—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring lateral position of a boundary of the object

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Recording Measured Values (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Electronic Switches (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1399256 Photo-electric edge detector E SICK 13 Oct 1972 [22 Oct 1971] 47365/72 Heading GIA The exact detection of the passage of an edge, between two contrasting areas 11, 12, as it passes across the field of view of photo-electric apparatus. is provided by summing the outputs of two detectors viewing zones 15', 16', respectively wholly within the contrasting areas, and subtracting therefrom twice the value of the output from a detector viewing central zone 14', the resultant signal being compared in a threshold device with a reference level 4 to provide a switching signal. In the arrangement of Fig. 2 besides the abovementioned calculation carried out on the detector outputs by computing amplifier 17, the difference between the outputs of detectors 15, 14 is determined by amplifier 19, to obtain information as to whether the transition is from light to dark or dark to light. The threshold levels (k 2 , k 3 ), which must be above k 1 , may be set individually. One type of transition may be detected at any one time by suitable positioning of switch 28 coupling to AND gate 22. If the type of transition is irrelevant, instead of switch 28 an OR gate is used. In Fig. 7, AND gates 23, 24 and flip-flop 25 are used to give indications at 26, 27 of when transitions in the respective directions occur. The threshold value k 1 of comparator 18 may be varied in accordance with variations in lamp intensity as sensed by a further photo-cell. Alternatively, the amplifier 17 may be adjusted.
GB4736572A 1971-10-22 1972-10-13 Method and apparatus for detecting the passing of a straight contrast boundary Expired GB1399256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712152732 DE2152732C3 (en) 1971-10-22 Device for detecting the passage of a contrast step which separates two surfaces of unequal brightness and is movable essentially perpendicular to its extent relative to the device

Publications (1)

Publication Number Publication Date
GB1399256A true GB1399256A (en) 1975-07-02

Family

ID=5823138

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4736572A Expired GB1399256A (en) 1971-10-22 1972-10-13 Method and apparatus for detecting the passing of a straight contrast boundary

Country Status (5)

Country Link
JP (1) JPS5517984B2 (en)
FR (1) FR2157594A5 (en)
GB (1) GB1399256A (en)
IT (1) IT969699B (en)
SE (1) SE380345B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2216255A (en) * 1988-02-22 1989-10-04 Brother Ind Ltd A sewing machine with a cloth edge detector
US6391481B1 (en) 1998-09-12 2002-05-21 Bayer Aktiengesellschaft Auxiliary layers for electroluminescent assemblies

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1054717A (en) * 1974-11-20 1979-05-15 E-Systems Optical reader correlation circuit
JPS5780995A (en) * 1980-11-07 1982-05-20 Sanshin Ind Co Ltd Muffler for outboard engine
DE3323214C1 (en) * 1983-06-28 1984-10-11 Dürkoppwerke GmbH, 4800 Bielefeld Optoelectronic scanning device on a sewing machine
FR2582683B1 (en) * 1985-06-03 1988-05-27 Prouvost Sa DEVICE FOR DETECTING THE VARIATION IN THICKNESS OF A FABRIC AND ITS CALIBRATION METHOD

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2216255A (en) * 1988-02-22 1989-10-04 Brother Ind Ltd A sewing machine with a cloth edge detector
US4924790A (en) * 1988-02-22 1990-05-15 Brother Kogyo Kabushiki Kaisha Sewing machine with a cloth-edge detector
GB2216255B (en) * 1988-02-22 1992-02-12 Brother Ind Ltd Sewing machine with a cloth-edge detector
US6391481B1 (en) 1998-09-12 2002-05-21 Bayer Aktiengesellschaft Auxiliary layers for electroluminescent assemblies

Also Published As

Publication number Publication date
DE2152732B2 (en) 1977-03-10
FR2157594A5 (en) 1973-06-01
SE380345B (en) 1975-11-03
JPS5517984B2 (en) 1980-05-15
JPS4851545A (en) 1973-07-19
DE2152732A1 (en) 1973-04-26
IT969699B (en) 1974-04-10

Similar Documents

Publication Publication Date Title
GB1432787A (en) Method for sensing the presence of fire and apparatus employing said method
HK1016254A1 (en) Thermal emitted radiation detecting device
ATE135480T1 (en) DIRECTIONAL SENSITIVE COUNTING AND SWITCHING DEVICE
GB1223453A (en) Apparatus for sensing the turbidity of a fluid
GB1453283A (en) Apparatus for identifying coins
GB1421004A (en) Light target and sensor
GB1399256A (en) Method and apparatus for detecting the passing of a straight contrast boundary
GB1452497A (en) Method and apparatus for analysis of leukocyts
ES402249A1 (en) Element position detector system
US3845319A (en) Method and apparatus for the accurate detection of the passage of the edge of a straight contrast jump
GB1521268A (en) Distance detecting apparatus
JPS5760566A (en) Magnetic head device
KR910006890A (en) Coin Identification Device
FR2425179A1 (en) EDDY CURRENT CONTROL DEVICE
SE8802197D0 (en) DEVICE WITH A RADIO DETECTION SYSTEM
US3584224A (en) Frame detection system
JPS55135480A (en) Pattern detecting device
GB1400225A (en) Apparatus for automatically determining and indicating competition results eypressable as a length
JPS56158977A (en) Presence detector
JPS5572825A (en) Detecting method for liquid level position in container
JPS52125388A (en) Defect inspection apparatus
JPS57132054A (en) Flaw detector
JPS52121384A (en) Defect inspecting apparatus
JPS5462798A (en) Centralized alarm and monitor device
JPS5377544A (en) Optical detector

Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee