JPS5790155A - Electromagnetic ultrasonic defect finding method and device thereof - Google Patents
Electromagnetic ultrasonic defect finding method and device thereofInfo
- Publication number
- JPS5790155A JPS5790155A JP55167240A JP16724080A JPS5790155A JP S5790155 A JPS5790155 A JP S5790155A JP 55167240 A JP55167240 A JP 55167240A JP 16724080 A JP16724080 A JP 16724080A JP S5790155 A JPS5790155 A JP S5790155A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- billet
- magnetic pole
- core
- current
- 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
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 enable the high-sensitive detection of an internal defect of an object to be inspected, by a method wherein the object to be inspected is AC-excited, and is charged with a pulse current at an arbitrary point of time of a period during which the ultrasonic current attains a peak value or in the proximity of the peak value. CONSTITUTION:A magnet 1, consisting of U-shaped core 1a and a coil 1b coiled around the core, is placed so that the core 1a faces a passage band of a SB, and a magnetic flux, emanating from a magnetic pole surface 2 of the magnet 1 through the excitation of the coil 1b with an AC current of about 100Hz, enters into a magnetic pole surface 3. An AC magnetic field, directing perpendicualrly to the movement direction of the billet SB, is produced on the upper surface of the billet SB. Probes 10 and 20 are located above the billet SB and between the magnetic pole surfaces 2 and 3, and flat square cylindrical transmitting and receiving coils 12 and 20 are housed in a case 11 of the probe 10. The transmiting coil 12 for generating ultrasonic waves is connected to a pulse oscillator via a connector 15, and the receiving coil 13 is joined to an amplifier via a connector 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55167240A JPS5790155A (en) | 1980-11-26 | 1980-11-26 | Electromagnetic ultrasonic defect finding method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55167240A JPS5790155A (en) | 1980-11-26 | 1980-11-26 | Electromagnetic ultrasonic defect finding method and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5790155A true JPS5790155A (en) | 1982-06-04 |
Family
ID=15846050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55167240A Pending JPS5790155A (en) | 1980-11-26 | 1980-11-26 | Electromagnetic ultrasonic defect finding method and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5790155A (en) |
-
1980
- 1980-11-26 JP JP55167240A patent/JPS5790155A/en active Pending
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