Abstract: An inspection probe (100) includes a Hall element (3) which detects the density of magnetic flux flowing in a magnetic circuit formed by a yoke (1), a magnet (2), and a magnetic pipe (P). A second outer circumferential surface (12a) of the yoke (1) is arranged to be located closer to the magnetic pipe (P) than a first outer circumferential surface (11a) of the yoke (1) is to the magnetic pipe (P).

Abstract: A defect of a magnetic member is quantitatively measured. An inspection probe (100) includes a plurality of magnets (2) which are provided along an outer circumference of a yoke in a circumferential direction and a plurality of Hall elements (3) which are provided on a plurality of magnetic circuits formed by the plurality of magnets (2) and a magnetic pipe (P) and which are arranged side by side with the plurality of magnets in an axial direction of the yoke to detect a density of a magnetic flux flowing through the plurality of magnetic circuits. With use of the inspection probe (100), an output from the plurality of Hall elements (3) is measured. Based on the output from the plurality of Hall elements (3), the presence/absence of the defect and a depth of the defect are calculated.

Abstract: An inspection probe (100) includes a Hall element (3) which detects the density of magnetic flux flowing in a magnetic circuit formed by a yoke (1), a magnet (2), and a magnetic pipe (P). A second outer circumferential surface (12a) of the yoke (1) is arranged to be located closer to the magnetic pipe (P) than a first outer circumferential surface (11a) of the yoke (1) is to the magnetic pipe (P).

Abstract: The present invention quickly carries out quantitative evaluation of a defect of a magnetic member. An inspection probe (100), which includes: a third magnet (4) polarized in a direction intersecting a counter surface facing a magnetic member; a Hall element (11) that detects a density of a magnetic flux passing through the third magnet (4) and the magnetic member, is used to apply, to an output signal from the Hall element (11), an evaluation algorithm which is selected according to whether a defective surface is a front surface or a back surface.

Abstract: The present invention quickly carries out quantitative evaluation of a defect of a magnetic member. An inspection probe (100), which includes: a third magnet (4) polarized in a direction intersecting a counter surface facing a magnetic member; a Hall element (11) that detects a density of a magnetic flux passing through the third magnet (4) and the magnetic member, is used to apply, to an output signal from the Hall element (11), an evaluation algorithm which is selected according to whether a defective surface is a front surface or a back surface.

Abstract: A defect of a magnetic member is quantitatively measured. An inspection probe (100) includes a magnet (2) and a Hall element (3) which is provided on a magnetic circuit formed by the magnet (2) and a magnetic pipe (P) and which detects a density of a magnetic flux flowing through the magnetic circuit. With use of the inspection probe (100), an output from the Hall element (3) is measured. Based on the output from the Hall element (3), the presence/absence of the defect and a depth of the defect are calculated.

Abstract: The eddy current flaw detection probe (100) includes a first yoke (1), a second yoke (2), a first permanent magnet (3), a second permanent magnet (4), a sensing coil (6). The second yoke (2) is inserted in a freely insertable and extractable manner along an inner peripheral surface of the first yoke (1).

Abstract: The eddy current flaw detection probe (100) includes a first yoke (1), a second yoke (2), a first permanent magnet (3), a second permanent magnet (4), a sensing coil (6). The second yoke (2) is inserted in a freely insertable and extractable manner along an inner peripheral surface of the first yoke (1).

Abstract: An insertion type eddy current flaw detection probe capable of more accurately detecting flaws in magnetic tubes is provided. A method for inspecting magnetic tubes for flaws with high accuracy is also provided. A eddy current flaw detection probe contains a cylindrical yoke (1), a plurality of detection coils (5) disposed around the central portion of the cylindrical yoke in the direction of a cylindrical axis thereof, first and second inner excitation coils (6) disposed on both sides of the plurality of detection coils in the direction of the cylindrical axis, and first and second permanent magnets (3, 4) disposed around the yoke on both sides of the first and second excitation coils in the direction of the cylindrical axis so that the direction of magnetizations thereof are parallel to the radial direction of the yoke and magnetic poles on the cylindrical yoke side thereof are different from each other.

Abstract: A method for inspecting corrosion under insulation simply and precisely at a low cost is provided. The method for inspecting CUI is characterized by obtaining signals from a fiber optical Doppler sensor attached to equipment and counting a waveform for a predetermined time before and after a point where an amplitude is over a threshold value as one acoustic emission (AE) signal, recording the AE signals and the maximum amplitudes thereof, subjecting the AE signals to a filtering process to remove noise signals, determining a frequency distribution of the AE signal hits relative to various maximum amplitude values, determining a regression line of the number of the AE hits relative to the maximum amplitudes from a scattering diagram which is obtained by double logarithmic expression of the frequency distribution, and judging existence or nonexistence of the corrosion based on a gradient of the regression line.

Abstract: An object of the present invention is to provide a method for inspecting the presence or absence of a foreign metallic material mixed into an austenitic stainless steel material weld with more satisfactory accuracy. The method for inspecting an austenitic stainless steel weld of the present invention is characterized by comprises performing eddy current test of a weld portion of an austenitic stainless steel using a probe comprising an excitation and inspection coil and a permanent magnet disposed inside the excitation and inspection coil, and inspecting the presence or absence of a foreign metallic material mixed into the weld portion, and is also characterized in that magnetic flux density of magnetic field formed by the permanent magnet is from about 0.3 to about 1.5 tesla.

Abstract: An insertion type eddy current flaw detection probe that is capable of more accurately detecting flaws in magnetic tubes is provided. A method for inspecting magnetic tubes for flaws with high accuracy is also provided. A eddy current flaw detection probe comprises a cylindrical yoke (1), a plurality of detection coils (5) disposed around the central portion of the cylindrical yoke in the direction of a cylindrical axis thereof, first and second inner excitation coils (6) disposed on both sides of the plurality of detection coils in the direction of the cylindrical axis, and first and second permanent magnets (3, 4) disposed around the yoke on both sides of the first and second excitation coils in the direction of the cylindrical axis so that the direction of magnetizations thereof are parallel to the radial direction of the yoke and magnetic poles on the cylindrical yoke side thereof are different from each other.

Abstract: The present invention realizes an inspection method for inspecting corrosion under insulation. This inspection method according to the present invention makes it possible to inspect corrosion easily and economically in piping furnished with heat insulators. The inspection method is an inspection method for inspecting corrosion under insulation, in piping to which an heat insulator is provided, and includes providing a fiber optical Doppler sensor to the piping; and inspecting the corrosion in the piping by using the fiber optical Doppler sensor.