JPS5745443A - Electromagnetic ultrasonic flaw detector - Google Patents

Electromagnetic ultrasonic flaw detector

Info

Publication number
JPS5745443A
JPS5745443A JP55119812A JP11981280A JPS5745443A JP S5745443 A JPS5745443 A JP S5745443A JP 55119812 A JP55119812 A JP 55119812A JP 11981280 A JP11981280 A JP 11981280A JP S5745443 A JPS5745443 A JP S5745443A
Authority
JP
Japan
Prior art keywords
coil
flaw detection
tube
excitation
period
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
JP55119812A
Other languages
Japanese (ja)
Inventor
Takashi Kadowaki
Akihiro Tanaka
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 JP55119812A priority Critical patent/JPS5745443A/en
Publication of JPS5745443A publication Critical patent/JPS5745443A/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
    • G01N29/24—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)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To reduce the inspector's fatigue and perform accurate flaw detection by holding the flaw detection waveform of the excitation period just before de-exciting in the non-excitation period of an electromagnet and displaying the same. CONSTITUTION:A DC electric power source 6 is controlled by an intermittent control circuit 7 to intermittently energize a DC coil 2. When a pulse generating circuit 8 supplies pulse current to a radio transmitting and receiving coil 4 while a control signal (c) is 1, ultrasonic waves propagates in a material 1 to be inspected, and the reflected ultrasonic waves from a flaw 1F and a bottom surface 1B are supplied via the coil 4 and an amplifier 12 to a cathode ray tube 13. On the other hand, when the control signals (c) goes to 0, a sweep signal generating circuit 11 stops sweeping on de-exciting of the coil 2, but the tube 13 has after-glow characteristic and the flaw detection waveform in the excitation period just before this is displayed in the tube 13. Thereby, the change in display image plane at every period of the intermittent excitation of the DC coil is obviated and the operator's fatigue is reduced.
JP55119812A 1980-09-01 1980-09-01 Electromagnetic ultrasonic flaw detector Pending JPS5745443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55119812A JPS5745443A (en) 1980-09-01 1980-09-01 Electromagnetic ultrasonic flaw detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55119812A JPS5745443A (en) 1980-09-01 1980-09-01 Electromagnetic ultrasonic flaw detector

Publications (1)

Publication Number Publication Date
JPS5745443A true JPS5745443A (en) 1982-03-15

Family

ID=14770838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55119812A Pending JPS5745443A (en) 1980-09-01 1980-09-01 Electromagnetic ultrasonic flaw detector

Country Status (1)

Country Link
JP (1) JPS5745443A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61139604A (en) * 1984-12-11 1986-06-26 Sumitomo Metal Ind Ltd Manufacture of medium or high carbon metallic powder
US6010725A (en) * 1996-07-09 2000-01-04 Nestec S.A. Spray-drying process

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548585A (en) * 1977-06-21 1979-01-22 Nippon Steel Corp Magnetic field generator for measuring instruments applying electromagnetic ultrasonic waves

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548585A (en) * 1977-06-21 1979-01-22 Nippon Steel Corp Magnetic field generator for measuring instruments applying electromagnetic ultrasonic waves

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61139604A (en) * 1984-12-11 1986-06-26 Sumitomo Metal Ind Ltd Manufacture of medium or high carbon metallic powder
JPH0346524B2 (en) * 1984-12-11 1991-07-16 Sumitomo Metal Ind
US6010725A (en) * 1996-07-09 2000-01-04 Nestec S.A. Spray-drying process

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