JPS57141548A - Ultrasonic flaw detecting method - Google Patents

Ultrasonic flaw detecting method

Info

Publication number
JPS57141548A
JPS57141548A JP56026426A JP2642681A JPS57141548A JP S57141548 A JPS57141548 A JP S57141548A JP 56026426 A JP56026426 A JP 56026426A JP 2642681 A JP2642681 A JP 2642681A JP S57141548 A JPS57141548 A JP S57141548A
Authority
JP
Japan
Prior art keywords
parts
probes
echo signals
signals
echo
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
JP56026426A
Other languages
Japanese (ja)
Inventor
Takeshi Kanegae
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.)
Tokyo Keiki Inc
Original Assignee
Tokyo Keiki 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 Tokyo Keiki Co Ltd filed Critical Tokyo Keiki Co Ltd
Priority to JP56026426A priority Critical patent/JPS57141548A/en
Publication of JPS57141548A publication Critical patent/JPS57141548A/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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
    • 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
    • G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
    • G01N29/0609—Display arrangements, e.g. colour displays
    • G01N29/0618—Display arrangements, e.g. colour displays synchronised with scanning, e.g. in real-time
    • G01N29/0627—Cathode-ray tube displays
    • 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
    • G01N29/4445—Classification of defects
    • 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
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
    • 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
    • G01N2291/10—Number of transducers
    • G01N2291/105—Number of transducers two or more emitters, two or more receivers

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 eliminate an effect of the multiplex reflection although the transmission repeating frequency is increased, by carrying out a subtraction with a subtractor for the received echo signals obtained from two probes and a receiving part and then extracting only the defective echo signal. CONSTITUTION:A transmitting part 2 is driven to give the vibration to two probes 4 and 3, and thus the ultrasonic waves are radiated to a material 15 to be inspected and put into the water 13 in a container 12 as well as to a healthy component 14 which has the same material and the same form as the material 15. The ultrasonic waves reflected from each part of both materials 15 and 14 are made incident to the probes 3 and 4, and the echo signals are transmitted to receiving parts 6 and 5 respectively. Both parts 5 and 6 are controlled to have the equivalent sensitivity. The output signals of the parts 5 and 6 are supplied to a subtractor 7 at one time to perform a subtraction. As a result, the echo signals given from the healthy parts of both components 14 and 15, the echo signals caused by the multiplex reflection and the noise signals are all erased. Thus only the defective echo signal of the material 15 emerges to be displayed at a CRT display part 11.
JP56026426A 1981-02-25 1981-02-25 Ultrasonic flaw detecting method Pending JPS57141548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56026426A JPS57141548A (en) 1981-02-25 1981-02-25 Ultrasonic flaw detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56026426A JPS57141548A (en) 1981-02-25 1981-02-25 Ultrasonic flaw detecting method

Publications (1)

Publication Number Publication Date
JPS57141548A true JPS57141548A (en) 1982-09-01

Family

ID=12193188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56026426A Pending JPS57141548A (en) 1981-02-25 1981-02-25 Ultrasonic flaw detecting method

Country Status (1)

Country Link
JP (1) JPS57141548A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62261955A (en) * 1986-05-09 1987-11-14 Toshiba Corp Ultrasonic flaw detecting device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114981A (en) * 1975-04-01 1976-10-09 Nippon Steel Corp Steel surface scar detecting method and equipment
JPS5242790A (en) * 1975-10-01 1977-04-02 Hitachi Ltd Method of inspecting appearance of objects

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114981A (en) * 1975-04-01 1976-10-09 Nippon Steel Corp Steel surface scar detecting method and equipment
JPS5242790A (en) * 1975-10-01 1977-04-02 Hitachi Ltd Method of inspecting appearance of objects

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62261955A (en) * 1986-05-09 1987-11-14 Toshiba Corp Ultrasonic flaw detecting device
JPH0584463B2 (en) * 1986-05-09 1993-12-02 Tokyo Shibaura Electric Co

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