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JPS5631639A - Electromagnetic ultrasonic wave flaw detector - Google Patents

Electromagnetic ultrasonic wave flaw detector

Info

Publication number
JPS5631639A
JPS5631639A JP10719279A JP10719279A JPS5631639A JP S5631639 A JPS5631639 A JP S5631639A JP 10719279 A JP10719279 A JP 10719279A JP 10719279 A JP10719279 A JP 10719279A JP S5631639 A JPS5631639 A JP S5631639A
Authority
JP
Japan
Prior art keywords
air gap
magnetic pole
electromagnet
floating
inspected
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
JP10719279A
Other languages
Japanese (ja)
Other versions
JPS6250780B2 (en
Inventor
Takashi Kadowaki
Yukito Sasaki
Koji Kawamura
Shuichi Sato
Akira Matsunami
Susumu Ito
Minoru Fujimoto
Jun Kubota
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
Nippon Steel Corp
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, Nippon Steel Corp filed Critical Hitachi Ltd
Priority to JP10719279A priority Critical patent/JPS5631639A/en
Publication of JPS5631639A publication Critical patent/JPS5631639A/en
Publication of JPS6250780B2 publication Critical patent/JPS6250780B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE: To increase the accuracy of flow detection, by constitution that the air gap between inspected material and the transmission and reception coils and DC electromagnet iron core can uniformly be held irrespectively of the change in unevenness of the surface of inspected material.
CONSTITUTION: The drive controlling circuit for up and down movement of the magnetic pole 12 is composed of the reference air gap setter 18, the 1st and 2nd differential amplifiers 19, 20 differentially operating with the output of air gap setter and the output signal of the air gap instruments 13, 17, and the automatic pulse phase shifter 21 operated with the differential amplifier output signal. First, if the surface of the inspected object 1 is flat, the attracting force of the floating electromagnet to the floating frame 16 is balanced with the self weight of the magnetic pole 12 and the floating electromagnet, and the air gaps G1, G2 hold the reference air gap. Next, if the surface of the inspected object 1 curves downward, since the exciting current of floating electromagnet is reduced corresponding to the amount of curve, the transmission and reception coil 7 moves downward with the magnetic pole 12 and the air gap G1 is kept constant. Further, the gap is uniformly held if the inspected object 1 curves upward, and the accuracy of flow detection can be increased.
COPYRIGHT: (C)1981,JPO&Japio
JP10719279A 1979-08-24 1979-08-24 Electromagnetic ultrasonic wave flaw detector Granted JPS5631639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10719279A JPS5631639A (en) 1979-08-24 1979-08-24 Electromagnetic ultrasonic wave flaw detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10719279A JPS5631639A (en) 1979-08-24 1979-08-24 Electromagnetic ultrasonic wave flaw detector

Publications (2)

Publication Number Publication Date
JPS5631639A true JPS5631639A (en) 1981-03-31
JPS6250780B2 JPS6250780B2 (en) 1987-10-27

Family

ID=14452797

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10719279A Granted JPS5631639A (en) 1979-08-24 1979-08-24 Electromagnetic ultrasonic wave flaw detector

Country Status (1)

Country Link
JP (1) JPS5631639A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57211062A (en) * 1981-06-22 1982-12-24 Hitachi Ltd Electromagnetic ultrasonic flaw detecting probe
WO1998010278A1 (en) * 1996-09-09 1998-03-12 Sonicforce, L.L.C Improved acoustic strain gauge and assembly and method for measuring strain
US5750900A (en) * 1996-09-09 1998-05-12 Sonicforce, L.L.C. Acoustic strain gauge and assembly and method for measuring strain
US5808201A (en) * 1996-09-09 1998-09-15 Sonicforce, L.L.C. Acoustic strain gauge
JP2020509388A (en) * 2017-03-02 2020-03-26 クエスト インテグレーテッド， エルエルシー Electromagnetic ultrasonic transducer (EMAT) for corrosion mapping

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57211062A (en) * 1981-06-22 1982-12-24 Hitachi Ltd Electromagnetic ultrasonic flaw detecting probe
WO1998010278A1 (en) * 1996-09-09 1998-03-12 Sonicforce, L.L.C Improved acoustic strain gauge and assembly and method for measuring strain
US5750900A (en) * 1996-09-09 1998-05-12 Sonicforce, L.L.C. Acoustic strain gauge and assembly and method for measuring strain
US5808201A (en) * 1996-09-09 1998-09-15 Sonicforce, L.L.C. Acoustic strain gauge
JP2020509388A (en) * 2017-03-02 2020-03-26 クエスト インテグレーテッド， エルエルシー Electromagnetic ultrasonic transducer (EMAT) for corrosion mapping
US11774409B2 (en) 2017-03-02 2023-10-03 Quest Integrated, Llc Electromagnetic acoustic transducer (EMAT) for corrosion mapping

Also Published As

Publication number Publication date
JPS6250780B2 (en) 1987-10-27

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