JPS5739308A - Automatic measuring device for crack length - Google Patents

Automatic measuring device for crack length

Info

Publication number
JPS5739308A
JPS5739308A JP11551380A JP11551380A JPS5739308A JP S5739308 A JPS5739308 A JP S5739308A JP 11551380 A JP11551380 A JP 11551380A JP 11551380 A JP11551380 A JP 11551380A JP S5739308 A JPS5739308 A JP S5739308A
Authority
JP
Japan
Prior art keywords
image pickup
length
crack
test piece
loads
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
JP11551380A
Other languages
Japanese (ja)
Inventor
Seiichiro Satomura
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.)
Akashi Seisakusho KK
Original Assignee
Akashi Seisakusho KK
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 Akashi Seisakusho KK filed Critical Akashi Seisakusho KK
Priority to JP11551380A priority Critical patent/JPS5739308A/en
Publication of JPS5739308A publication Critical patent/JPS5739308A/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
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

PURPOSE:To make automatic measurement possible while maintaining high accuracy by performing the measurement of the length of cracks produced in a test piece when repetitive loads are applied thereto by an image pickup signal having a synchronizing means, an arithmetic circuit making signal processing thereof, etc. CONSTITUTION:Repetitive loads are applied to a test by using an actuator and the length of the cracks produced on the test piece at that time is measured by using an image pickup tube which is so arranged as to operate synchronously with the loads, a signal processor, etc. For example, the cracked part of a test piece 1 which is being applied with repetitive loads by an actuator A is observed with a monitor 8 via an image pickup tube 7. At this time, a strobe 10 is triggered to emit light synchronously with the load periods or a shutter 16 is opened or closed, or further a synchronizing signal is applied to the image pickup tube or the like by using a circuit 17 so that image pickup is accomplished when the crack opens most, whereby the length of the crack is automatically measured through the use of a crack length read circuit 9 and the like.
JP11551380A 1980-08-22 1980-08-22 Automatic measuring device for crack length Pending JPS5739308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11551380A JPS5739308A (en) 1980-08-22 1980-08-22 Automatic measuring device for crack length

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11551380A JPS5739308A (en) 1980-08-22 1980-08-22 Automatic measuring device for crack length

Publications (1)

Publication Number Publication Date
JPS5739308A true JPS5739308A (en) 1982-03-04

Family

ID=14664375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11551380A Pending JPS5739308A (en) 1980-08-22 1980-08-22 Automatic measuring device for crack length

Country Status (1)

Country Link
JP (1) JPS5739308A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288503A (en) * 1986-06-06 1987-12-15 Sumitomo Metal Ind Ltd Method for measuring crack of coke oven wall
FR2646468A1 (en) * 1989-04-28 1990-11-02 Alsthom Gec Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane
WO2018164212A1 (en) * 2017-03-09 2018-09-13 国立研究開発法人産業技術総合研究所 Crack tip end position detecting method, and adhesive peeling position detecting method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288503A (en) * 1986-06-06 1987-12-15 Sumitomo Metal Ind Ltd Method for measuring crack of coke oven wall
FR2646468A1 (en) * 1989-04-28 1990-11-02 Alsthom Gec Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane
WO2018164212A1 (en) * 2017-03-09 2018-09-13 国立研究開発法人産業技術総合研究所 Crack tip end position detecting method, and adhesive peeling position detecting method

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