JPS57203949A - Electromagnetic ultrasonic flaw detector - Google Patents

Electromagnetic ultrasonic flaw detector

Info

Publication number
JPS57203949A
JPS57203949A JP56088188A JP8818881A JPS57203949A JP S57203949 A JPS57203949 A JP S57203949A JP 56088188 A JP56088188 A JP 56088188A JP 8818881 A JP8818881 A JP 8818881A JP S57203949 A JPS57203949 A JP S57203949A
Authority
JP
Japan
Prior art keywords
inspected
excitation coil
coil
detection signal
transmitting
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
JP56088188A
Other languages
Japanese (ja)
Other versions
JPH0147742B2 (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 JP56088188A priority Critical patent/JPS57203949A/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 JPS57203949A publication Critical patent/JPS57203949A/en
Publication of JPH0147742B2 publication Critical patent/JPH0147742B2/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]

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)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To elevate the sensitivity of detection with a larger detection signal by winding a DC excitation coil around material to be detected, wrapping it so as to leave a space in which a receiving/transmitting coil is provided. CONSTITUTION:A DC excitation coil 12 is wound around material 1 to be inspected in wrapping manner and a transmitting/receiving coil 11 is disposed at the position facing the material 1 at the center thereof 12. A DC magnetic flux generated from the DC excitation coil 12 mostly passes through the material 1 being inspected in the direction parallel to the surface thereof 1. This makes larger the magnetic field component parallel to the surface of the material being inspected necessary for transmission or reception of a vertical electromagnetic sound wave to increase the detection signal level thereby enabling a higher flaw detection sensitivity.
JP56088188A 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector Granted JPS57203949A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56088188A JPS57203949A (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
JP56088188A JPS57203949A (en) 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector

Publications (2)

Publication Number Publication Date
JPS57203949A true JPS57203949A (en) 1982-12-14
JPH0147742B2 JPH0147742B2 (en) 1989-10-16

Family

ID=13935919

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56088188A Granted JPS57203949A (en) 1981-06-10 1981-06-10 Electromagnetic ultrasonic flaw detector

Country Status (1)

Country Link
JP (1) JPS57203949A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPH0147742B2 (en) 1989-10-16

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