JPS5772003A - Method of measuring inner diameter of transparent tube - Google Patents

Method of measuring inner diameter of transparent tube

Info

Publication number
JPS5772003A
JPS5772003A JP14799780A JP14799780A JPS5772003A JP S5772003 A JPS5772003 A JP S5772003A JP 14799780 A JP14799780 A JP 14799780A JP 14799780 A JP14799780 A JP 14799780A JP S5772003 A JPS5772003 A JP S5772003A
Authority
JP
Japan
Prior art keywords
measured
inner diameter
tube
glass tube
bright lines
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.)
Granted
Application number
JP14799780A
Other languages
Japanese (ja)
Other versions
JPS632322B2 (en
Inventor
Yoshiki Sakurai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14799780A priority Critical patent/JPS5772003A/en
Publication of JPS5772003A publication Critical patent/JPS5772003A/en
Publication of JPS632322B2 publication Critical patent/JPS632322B2/ja
Granted 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
    • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters

Landscapes

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

Abstract

PURPOSE:To permit non-contact and high accurate measurement of an inner diameter with simple construction and measuring procedures by a method wherein a transparent tube to be measured is disposed in parallel light flux to focus the transmitted light on an image pickup system and there are measured a refractive index of the measured tube and a distance between two bright lines in dark images which are produced as shadows of the measured tube. CONSTITUTION:A glass tube 21 to be measured is vertically disposed and held by a support 22 in parallel light flux emitted from a parallel light source 23 which comprises a tungsten lamp and a lens system,thereby to focus the transmitted light on a vidicon camera 24 for image pickup. An image on a monitor 27 indicates two bright lines 54, 55 in shadows 51, 52 of the glass tube 21. On the basis of measured values of a distance of those two bright lines and a refractive index of the glass tube 21, an inner diameter of the glass tube 21 is calculated using a predetermined pertient formaula. By so doing, it becomes possible to make non-contact and high accurate measurement of an inner diameter with simple construction and measuring procedures.
JP14799780A 1980-10-22 1980-10-22 Method of measuring inner diameter of transparent tube Granted JPS5772003A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14799780A JPS5772003A (en) 1980-10-22 1980-10-22 Method of measuring inner diameter of transparent tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14799780A JPS5772003A (en) 1980-10-22 1980-10-22 Method of measuring inner diameter of transparent tube

Publications (2)

Publication Number Publication Date
JPS5772003A true JPS5772003A (en) 1982-05-06
JPS632322B2 JPS632322B2 (en) 1988-01-18

Family

ID=15442799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14799780A Granted JPS5772003A (en) 1980-10-22 1980-10-22 Method of measuring inner diameter of transparent tube

Country Status (1)

Country Link
JP (1) JPS5772003A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006519990A (en) * 2003-03-12 2006-08-31 コミツサリア タ レネルジー アトミーク A method to measure three-dimensional objects by back-light shadowgraphy
JP2008512667A (en) * 2004-09-10 2008-04-24 コミッサリア タ レネルジー アトミーク A method for measuring a three-dimensional object using the optical law of light propagation by a shadow graph method using a single viewpoint optical system.
EP3534106A1 (en) * 2018-03-01 2019-09-04 Mitutoyo Corporation Apparatuses for inner diameter measurement of transparent tube
WO2019193247A1 (en) * 2018-04-04 2019-10-10 Teknologian Tutkimuskeskus Vtt Oy Optical measurement of inner diameter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6337511A (en) * 1986-07-30 1988-02-18 昭和電線電纜株式会社 Watertight ow wire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006519990A (en) * 2003-03-12 2006-08-31 コミツサリア タ レネルジー アトミーク A method to measure three-dimensional objects by back-light shadowgraphy
JP2008512667A (en) * 2004-09-10 2008-04-24 コミッサリア タ レネルジー アトミーク A method for measuring a three-dimensional object using the optical law of light propagation by a shadow graph method using a single viewpoint optical system.
EP3534106A1 (en) * 2018-03-01 2019-09-04 Mitutoyo Corporation Apparatuses for inner diameter measurement of transparent tube
EP3537100A1 (en) * 2018-03-01 2019-09-11 Mitutoyo Corporation Method and apparatus for refractive index measurement of transparent tube
US10458779B2 (en) 2018-03-01 2019-10-29 Mitutoyo Corporation Method and apparatus for inner diameter measurement of transparent tube
WO2019193247A1 (en) * 2018-04-04 2019-10-10 Teknologian Tutkimuskeskus Vtt Oy Optical measurement of inner diameter

Also Published As

Publication number Publication date
JPS632322B2 (en) 1988-01-18

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