JPS57203950A - Electromagnetic ultrasonic flaw detector - Google Patents

Electromagnetic ultrasonic flaw detector

Info

Publication number
JPS57203950A
JPS57203950A JP56088189A JP8818981A JPS57203950A JP S57203950 A JPS57203950 A JP S57203950A JP 56088189 A JP56088189 A JP 56088189A JP 8818981 A JP8818981 A JP 8818981A JP S57203950 A JPS57203950 A JP S57203950A
Authority
JP
Japan
Prior art keywords
detected
exciting coils
electromagnetic ultrasonic
coils
ultrasonic flaw
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
JP56088189A
Other languages
Japanese (ja)
Other versions
JPH0145577B2 (en
Inventor
Hisao Yamaguchi
Kazuo Fujisawa
Takashi Kadowaki
Susumu Ito
Soji Sasaki
Kazuya Sato
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
Nippon Steel Corp
Original Assignee
Hitachi Ltd
Sumitomo Metal Industries 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, Sumitomo Metal Industries Ltd filed Critical Hitachi Ltd
Priority to JP56088189A priority Critical patent/JPS57203950A/en
Priority to DE8282302944T priority patent/DE3275315D1/en
Priority to EP82302944A priority patent/EP0067065B1/en
Priority to US06/386,445 priority patent/US4450725A/en
Publication of JPS57203950A publication Critical patent/JPS57203950A/en
Publication of JPH0145577B2 publication Critical patent/JPH0145577B2/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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
    • 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
    • G01N2291/042—Wave modes
    • G01N2291/0421—Longitudinal waves

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (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 raise a detection signal level and thereby to improve the detection sensitivity by winding two DC exciting coils around a material to be detected in a surrounding manner and by arranging a transmission-reception coil in a space between the two DC exciting coils. CONSTITUTION:Two DC exciting coils 11 and 12 are wound independently around a material 1 to be detected in a surrounding manner. Then, excitation is made so that magnetic fluxes generated from the two DC exciting coils are joined, while a transmission-reception coil 13 is arranged opposite to the material 1 to be detected in a space between the coils 11 and 12. Most of the magnetic fluxes generated from the DC exciting coils 11 and 12 pass through the inside of the material 1 and the directions thereof are in parallel to the surface of the material 1 to be detected. Accordingly, the component of magnetic flux required for transmitting and receiving a longitudinal electromagnetic ultrasonic wave and being parallel to the surface of the material to be detected is made large and thus a detection signal level can be raised.
JP56088189A 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector Granted JPS57203950A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56088189A JPS57203950A (en) 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector
DE8282302944T DE3275315D1 (en) 1981-06-10 1982-06-08 Electromagnetic-acoustic measuring apparatus
EP82302944A EP0067065B1 (en) 1981-06-10 1982-06-08 Electromagnetic-acoustic measuring apparatus
US06/386,445 US4450725A (en) 1981-06-10 1982-06-09 Electromagnetic-acoustic measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56088189A JPS57203950A (en) 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector

Publications (2)

Publication Number Publication Date
JPS57203950A true JPS57203950A (en) 1982-12-14
JPH0145577B2 JPH0145577B2 (en) 1989-10-04

Family

ID=13935948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56088189A Granted JPS57203950A (en) 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector

Country Status (1)

Country Link
JP (1) JPS57203950A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61228345A (en) * 1985-04-02 1986-10-11 Hitachi Constr Mach Co Ltd Method for measuring depth of surface aperture flaw of solid by ultrasonic wave
US5218868A (en) * 1990-02-27 1993-06-15 Nkk Corporation Signal processing method for magnetic-ultrasonic wall thickness measuring apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53105282A (en) * 1977-02-25 1978-09-13 Nippon Steel Corp Electromagnetic type ultrasonic transmitter-receiver
JPS5655851A (en) * 1979-10-12 1981-05-16 Sumitomo Metal Ind Ltd Flaw-detecting method by surface wave

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53105282A (en) * 1977-02-25 1978-09-13 Nippon Steel Corp Electromagnetic type ultrasonic transmitter-receiver
JPS5655851A (en) * 1979-10-12 1981-05-16 Sumitomo Metal Ind Ltd Flaw-detecting method by surface wave

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61228345A (en) * 1985-04-02 1986-10-11 Hitachi Constr Mach Co Ltd Method for measuring depth of surface aperture flaw of solid by ultrasonic wave
JPH0513263B2 (en) * 1985-04-02 1993-02-22 Hitachi Construction Machinery
US5218868A (en) * 1990-02-27 1993-06-15 Nkk Corporation Signal processing method for magnetic-ultrasonic wall thickness measuring apparatus

Also Published As

Publication number Publication date
JPH0145577B2 (en) 1989-10-04

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