JPS5746103A - Measurement of optical length - Google Patents

Measurement of optical length

Info

Publication number
JPS5746103A
JPS5746103A JP12254480A JP12254480A JPS5746103A JP S5746103 A JPS5746103 A JP S5746103A JP 12254480 A JP12254480 A JP 12254480A JP 12254480 A JP12254480 A JP 12254480A JP S5746103 A JPS5746103 A JP S5746103A
Authority
JP
Japan
Prior art keywords
frequency
light
multiplexer
measured
output
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.)
Pending
Application number
JP12254480A
Other languages
Japanese (ja)
Inventor
Sakae Tezuka
Kiyoshi Ookubo
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP12254480A priority Critical patent/JPS5746103A/en
Publication of JPS5746103A publication Critical patent/JPS5746103A/en
Pending 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)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

PURPOSE:To enable a highly accurate measurement of length by determining it with the harmonic detection of the output of a photo detector employing a modulated irradiation light when a shield length is detected for an irradiation light to an object to be measured. CONSTITUTION:A light from a linear light source 20 which is flashed synchronizing an oscillation frequency f0 of an oscillator 22 irradiates an object 20 to be measured while the light not shielded is collected to an Si photo diode linear array with a lens 14. A photo detector 12 is driven at a frequency of fs to allow the scanning of a multiplexer 36. The frequency f0 is now 5 to 10 times larger than fs. The output of the multiplexer 36 undergoes a harmonic detection at the frequency f0 with a detector 40. A pulse with a peak value above the set value is selected with a comparator 42 and sent to a counter 46 which counts pulses at each scanning cycle 1/fs receiving from a clock pulse generator 44. The signal is given to an arithmetic device 48 to determine the width of the object 10 at a high accuracy.
JP12254480A 1980-09-04 1980-09-04 Measurement of optical length Pending JPS5746103A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12254480A JPS5746103A (en) 1980-09-04 1980-09-04 Measurement of optical length

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12254480A JPS5746103A (en) 1980-09-04 1980-09-04 Measurement of optical length

Publications (1)

Publication Number Publication Date
JPS5746103A true JPS5746103A (en) 1982-03-16

Family

ID=14838493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12254480A Pending JPS5746103A (en) 1980-09-04 1980-09-04 Measurement of optical length

Country Status (1)

Country Link
JP (1) JPS5746103A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2545925A1 (en) * 1983-05-10 1984-11-16 Erhardt & Leimer Gmbh Photoelectronic lateral edge sensor for path regulator
JPS63281005A (en) * 1987-05-13 1988-11-17 Sumitomo Metal Ind Ltd Measuring instrument for end part position of body
US5752426A (en) * 1909-04-04 1998-05-19 Komatsu Ltd. Pilot pressure operated directional control valve and an operating cylinder control apparatus
US5867274A (en) * 1997-02-14 1999-02-02 Harris Instrument Corporation System for the measurement of the cut length of moving articles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5752426A (en) * 1909-04-04 1998-05-19 Komatsu Ltd. Pilot pressure operated directional control valve and an operating cylinder control apparatus
FR2545925A1 (en) * 1983-05-10 1984-11-16 Erhardt & Leimer Gmbh Photoelectronic lateral edge sensor for path regulator
JPS63281005A (en) * 1987-05-13 1988-11-17 Sumitomo Metal Ind Ltd Measuring instrument for end part position of body
JPH0619247B2 (en) * 1987-05-13 1994-03-16 住友金属工業株式会社 Object edge position measuring device
US5867274A (en) * 1997-02-14 1999-02-02 Harris Instrument Corporation System for the measurement of the cut length of moving articles

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