JPS57135354A - Defect detecting method of substance - Google Patents

Defect detecting method of substance

Info

Publication number
JPS57135354A
JPS57135354A JP56020096A JP2009681A JPS57135354A JP S57135354 A JPS57135354 A JP S57135354A JP 56020096 A JP56020096 A JP 56020096A JP 2009681 A JP2009681 A JP 2009681A JP S57135354 A JPS57135354 A JP S57135354A
Authority
JP
Japan
Prior art keywords
substance
wave
inspected
pseudo
defect
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
JP56020096A
Other languages
Japanese (ja)
Inventor
Tsutomu Masumoto
Mamoru Takeuchi
Tasuku Shimizu
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56020096A priority Critical patent/JPS57135354A/en
Publication of JPS57135354A publication Critical patent/JPS57135354A/en
Pending 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
    • G01N29/04—Analysing solids
    • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness

Landscapes

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

Abstract

PURPOSE:To detect whether a defect exists or not, its state and its shape, by providing a pseudo AE wave to a substance to be inspected, from a pseudo AE wave generator, detecting it by a detecting sensor provided on the substance to be inspected, calculating a propagation speed, and comparing it with a data derived in advance. CONSTITUTION:A pseudo AE wave generator (sensor) 1 and AE wave receiving sensors 4 (D1-Dn) are installed to a substance to be inspected 3. The generator 1 receives a pulse of a pulse generator 2, converts it to a mechanical oscillation, and applies a pseudo AE wave signal to the substance 3. An AE wave detected by each channel D1-Dn of the sensor 4 is inputted to a computer 8 through a time difference measuring device 7, and on the other hand, a distance between each channel is set to the computer 8, a propagation speed can be calculated. Depth of the substance to be inspected can be calculated by deriving in advance a data showing the ratio of depth of a defect to plate thickness of a substance to be tested. Also, the direction and dimensions of a defect can be derived by providing the sensors D1, D2 on both the inside and the outside of an area where a plate thickness decrease effect due to the defect exists.
JP56020096A 1981-02-16 1981-02-16 Defect detecting method of substance Pending JPS57135354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56020096A JPS57135354A (en) 1981-02-16 1981-02-16 Defect detecting method of substance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56020096A JPS57135354A (en) 1981-02-16 1981-02-16 Defect detecting method of substance

Publications (1)

Publication Number Publication Date
JPS57135354A true JPS57135354A (en) 1982-08-20

Family

ID=12017579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56020096A Pending JPS57135354A (en) 1981-02-16 1981-02-16 Defect detecting method of substance

Country Status (1)

Country Link
JP (1) JPS57135354A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186122A (en) * 1987-01-28 1988-08-01 Power Reactor & Nuclear Fuel Dev Corp Abnormality diagnosing system for structure
CN108982661A (en) * 2018-04-12 2018-12-11 杭州汽轮铸锻有限公司 A kind of ultrasonic wave calculating assessment method of false defect

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186122A (en) * 1987-01-28 1988-08-01 Power Reactor & Nuclear Fuel Dev Corp Abnormality diagnosing system for structure
JPH0511895B2 (en) * 1987-01-28 1993-02-16 Doryokuro Kakunenryo Kaihatsu Jigyodan
CN108982661A (en) * 2018-04-12 2018-12-11 杭州汽轮铸锻有限公司 A kind of ultrasonic wave calculating assessment method of false defect

Similar Documents

Publication Publication Date Title
ES2019800A6 (en) Acoustic emission leak source location
US3486368A (en) Ultrasonic inspection apparatus
JPS5353386A (en) Time difference detection circuit
JPS5697817A (en) Cracking shape detecting method
JPS57135354A (en) Defect detecting method of substance
JPS56164953A (en) Ultrasonic inspecting device for junction part
JPS6449448A (en) Error detector
JPS57151841A (en) Apparatus for monitoring remaining life of turbine rotor
JPS57144458A (en) Ultrasonic flaw detector
JPS5912304A (en) Method for measuring thickness of floating material on surface of water
JPH0136064B2 (en)
JPS56168129A (en) Self-heat generation detector for deposit
JPS5459191A (en) Method and apparatus for detection of minute leakage
JPS5621059A (en) Method and device for determining position in ae measurement
JPS5312350A (en) Inspection method of signal transmitter in high speed rotary flaw detector
JPS52143881A (en) Ultrasonic flaw detection output evaluating device
JPS561349A (en) Measuring method of propagation time of sound wave and finding position
GB2011618A (en) Method and apparatus for acoustic signal detection
JPS6454348A (en) Measuring method for water in incubation land
JPS6436392A (en) Sheet paper discriminator
JPS55164353A (en) Hardening characteristic measuring unit by acoustic measurement
JPS57108752A (en) Ultrasonic flaw detector
JPS55132949A (en) Defect detector
JPS5370473A (en) Partial discharge measuring apparatus
JPS5510501A (en) Measuring method of signal detection time