JPS5784353A - Damage detecting method for object - Google Patents

Damage detecting method for object

Info

Publication number
JPS5784353A
JPS5784353A JP55159586A JP15958680A JPS5784353A JP S5784353 A JPS5784353 A JP S5784353A JP 55159586 A JP55159586 A JP 55159586A JP 15958680 A JP15958680 A JP 15958680A JP S5784353 A JPS5784353 A JP S5784353A
Authority
JP
Japan
Prior art keywords
circuits
measured
damage
circuit
accurately detect
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
JP55159586A
Other languages
Japanese (ja)
Other versions
JPS6343708B2 (en
Inventor
Ken Tsukada
Takashi Suzuki
Jun Oka
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.)
Nippon Steel Corp
Original Assignee
Nippon 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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP55159586A priority Critical patent/JPS5784353A/en
Publication of JPS5784353A publication Critical patent/JPS5784353A/en
Publication of JPS6343708B2 publication Critical patent/JPS6343708B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4454—Signal recognition, e.g. specific values or portions, signal events, signatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques

Landscapes

  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To accurately detect presence of a damage on an object being measured and its degree, by dividing an AE signal into circuits of two system of different attenuation effects, and also by classifying and accumulating signals by attenuation ratios. CONSTITUTION:A signal, which is obtained from an AE sensor 6 attached onto an object being measured, is divided through a preamplifier 7 into high-pass filters 8a and 8b having different cut-off frequencies, and after passing through envelope detectors 9a and 9b, and peak-holding circuits 10a and 10b, ratios of respective peak values are measured in a ratio measuring circuit 11. The measuring output is put into a measuring circuit 18 through a modulation circuit 12, an FM transmitter 13, transmitting and receiving antennas 14 and 15, an FM receiver 16 and a demodulation circuit 17, classification is done by set widths, and counted by counting-and-memory circuits 19a-19n. Then, contents of the circuits 19a-19n are read out at a constant cycle and indicated on an indicating device 21. It is possible, by so doing, to accurately detect whether or not a damage is present on a member moving or even turning at a high speed.
JP55159586A 1980-11-14 1980-11-14 Damage detecting method for object Granted JPS5784353A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55159586A JPS5784353A (en) 1980-11-14 1980-11-14 Damage detecting method for object

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55159586A JPS5784353A (en) 1980-11-14 1980-11-14 Damage detecting method for object

Publications (2)

Publication Number Publication Date
JPS5784353A true JPS5784353A (en) 1982-05-26
JPS6343708B2 JPS6343708B2 (en) 1988-09-01

Family

ID=15696941

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55159586A Granted JPS5784353A (en) 1980-11-14 1980-11-14 Damage detecting method for object

Country Status (1)

Country Link
JP (1) JPS5784353A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009204565A (en) * 2008-02-29 2009-09-10 Jfe Steel Corp Abnormality diagnosis apparatus for rotary shaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH029610A (en) * 1988-06-29 1990-01-12 Inoue Mtp Co Ltd Manufacture of head-rest for automobile

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542007A (en) * 1978-09-20 1980-03-25 Hitachi Ltd Acoustic emission detecting device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542007A (en) * 1978-09-20 1980-03-25 Hitachi Ltd Acoustic emission detecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009204565A (en) * 2008-02-29 2009-09-10 Jfe Steel Corp Abnormality diagnosis apparatus for rotary shaft

Also Published As

Publication number Publication date
JPS6343708B2 (en) 1988-09-01

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