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JPH01100450

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DESCRIPTION JPH01100450
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic ultrasonic probe capable of performing various measurements or inspections of
a conductive test material by generating ultrasonic waves using an electromagnetic induction
phenomenon. Ru. 2. Description of the Related Art Conventionally, as a method of nondestructive
inspection of a material, there is known a method of propagating ultrasonic waves inside the
material, detecting the transmitted wave and reflected wave, and performing various
measurements and inspections. FIGS. 3 (a) and 3 (b) are diagrams showing a conventional
example of an electromagnetic ultrasonic probe in which a transverse wave is incident at an
oblique angle. In the figure, (1) is a magnetic field generator, (2a) to (2y) magnet segment), 131
is a coil, and (4) is a test material having conductivity. Next, the principle of oblique wave
incidence of a transverse wave by a conventional electromagnetic ultrasonic probe will be
described using FIGS. 5 (a) and 5 (b). As illustrated, the magnet segments / / (2a) to (2y) are
equal in width in the direction in which they line up, and have two magnetic poles of N pole and
8 poles, and p adjacent poles are adjacent to each other It is formed in combination to be
opposite. As shown in FIG. 5 (a), the magnetic field direction changes at a constant pitch on the
surface of the test material (4) by the magnet segments (2a) to (2y), and A periodic magnetic field
Ba% By that is orthogonal to the surface of the test material (4) is generated. On the other hand,
as shown in FIG. 5 (b), the coil (3) is divided into the magnet segments (2a) to (2y)? : An eddy
current J is induced on the surface of the test material (4) by causing the eddy current to flow
parallel to the surface of the test material (4) across the surface and the eddy current J and the
periodic magnetic field Ba As a result of interaction with each of y By, Lorentz force Pa ?Fy, ie,
ultrasonic vibration is generated. The Lorentz force Fa% Fy is generated so that the directions of
the magnetic fields are different from each other with a constant pitch, so that the directions of
the magnetic field B y By are also opposite to each other in the direction perpendicular to the
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sheet with the same constant pitch. Therefore, the Lorentz force generated at each position, that
is, the phase of the ultrasonic vibration changes in every 180 ? in the period of the width of the
magnet segment, and the phase of the ultrasonic vibration Fa ?Fy at each point is It agrees in
the direction ? shown in 1) to form a two synthesized wavefront. D sin ? = eight
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Also, since the current flowing through the coil (3)
is an oscillating current as shown in FIG. 5, the ultrasonic vibration Fa% Fy generates the
magnetic field because the vortices are displaced in the direction of the current flow in opposite
directions in time. (Parts of 11 occur in two directions.
[Problems to be Solved by the Invention] FIGS. 4 (a) and 4 (b) show the magnetic field by the
magnet segment of the conventional 'i [4 fi ultrasonic probe, and (a) ) Shows a case where a
single magnet segment is present, and (b) shows a case where a plurality of, for example, three of
the magnet segments are arranged. In FIG. 4 (,), the magnetic field produced around the magnet
segment (2y) is formed to pass through the inside of the test material (4), and the magnetic flux 1
perpendicular to the surface of the test material (4) It will occur. On the other hand, in FIG. 4 (b),
the magnet segments (21) and (2k) of the magnet segments at one end (a magnetic path passing
through the inside of the test material (4) is formed at the end not adjacent to 20). However,
because the magnet segments (2i) and (2k) and the magnet segments (2i) and (2k) are adjacent
to each other, the magnet segments (2j) are adjacent to each other because they are in contact
with each other. A closed magnetic circuit is formed between the magnetic poles, and the
generation rate of the magnetic field passing through the inside of the test material is reduced.
By the way, as described in the section of the conventional electromagnetic ultrasonic probe, one
of the components necessary for the action for forming the ultrasonic vibration, ie, the Lorentz
force, is on the surface of the test material inside the test material. If the magnetic flux passing
through the inside of the test material is small at adjacent portions of the magnetic poles as in
the case of @ 4 (b) due to the magnetic flux flowing in the perpendicular direction, that is, if the
magnetic flux intensity in the direction perpendicular to the surface of the test material is small,
The problem is that the strength of the Lorentz force generation decreases. The present invention
has been made to solve one or more problems, and the magnetic field formed solely by each
magnet segment can be maintained even when a plurality of magnet segments are aligned. Thus,
a magnetic field having magnetic flux in a direction perpendicular to the surface of the test
material is efficiently formed inside the test material. [Means for Solving the Problems] In the
electromagnetic ultrasonic probe according to the present invention, there are two strengths in
which the superconductor is sandwiched between the magnet segments so as to be adjacent to
each magnet segment between all the magnet segments. A magnetic body is provided so that the
magnetic field formed by each magnet segment is led to the ferromagnetic body and passes
through the inside of the test material, and the magnetic field by the adjacent magnet segments is
sandwiched by the ferromagnetic body The magnetic fields from adjacent magnet segments are
effectively formed through the inside of the test material without mutual interaction due to the
diamagnetic action of the ultrasonic conductor, and the magnetic flux orthogonal to the surface
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of the test material The strength is increased, and the strength of the Lorentz force formed by the
interaction with the vortex ta can be improved.
[Operation] The articulating supersonic probe according to the present invention is provided with
a superconductor which is sandwiched between two ferromagnetic members between the
magnet segments such that the magnet segment and the ferromagnetic member are adjacent to
each other. Since the magnetic fields from the respective magnet segments are guided to the
ferromagnetic body and pass through the inside of the test material, and the magnetic fields
adjacent to each other do not interact due to the diamagnetic action of the superconductor, the
magnetic fields from the magnet segments are effectively The inspection material is formed to
pass through the inside, and as a result, a component of the magnetic flux orthogonal to the
surface of the test material is efficiently generated, so that the generation strength of 0-ray: /
tsuka can be improved. 1 (a) and 1 (b) show an embodiment of an electromagnetic ultrasonic
probe according to the present invention. In the same figure, (1) is a magnetic field generator,
(2a) to (2y) are magnet segments, (5a) to (5x) and (5a ') to (5x') are for example ferromagnetic
materials such as filaments, 6a) to (6x) are superconductors. 2 (b) is an enlarged view of a part of
FIG. 1 (a). In FIG. 1, the superconductors (6a) to (6X) I-! Each of the ferromagnetic members (5a),
(5a ') to (5x), (5x') is provided so as to be sandwiched between each of the magnet segments (2a)
to (2y). ing. Further, the magnet segments (2a) to (2y) H are arranged in combination so that
adjacent @ poles adjacent to each other are opposite to each other. The coil (3) is formed around
the magnetic field generator (1) by the magnet segments (2a) to (2y) + the ferromagnetic
members (5a), (5a ') to (5x), (5x'). And, it is wound in a direction crossing the superconductors
(6a) to (6x). The magnet segments (2a) to (2y) of the coil (3), the ferromagnetic members (5a),
(5a ') to (5x), (5x'), and the superconductors (6a) to (6a) One side of the straight portion crossing
(6X) is opposed to the test material (4), as described in the section of the conventional
electromagnetic ultrasonic probe, in the vicinity of the surface of the test material (4) 'F! : The
principle of generation and oblique incidence of transverse waves is as described in the prior art.
Next, the features of the electromagnetic ultrasonic probe according to the present invention will
be described below with reference to FIGS. 2 (a) and 2 (b). FIG. 2 (a) shows the case where one
(2j) of the magnet segments (2a) to (2y) is alone against the test material (4). In Aju, a single
magnet segment) (2j) is a typical magnetic path representation of the magnetic field formed.
In the same figure, since the test material (4) exists in the vicinity of the magnetic field lj and the
magnet segment (formed around the magnet segment (20), the magnetic field lj is the test
material (4 The magnetic field lj in the inside of the test material (4) passes through the inside of
the test material (4) to generate a magnetic flux orthogonal to the surface of the test material (4).
On the other hand, in FIG. 2 (b), (20 and (2k) indicate the magnet segments v (5J) + (5j ') indicate
the ferromagnetic material, and the hatched portion (6j) H indicates the superconductor.
Magnetic field by said magnet segments) (2j) and (2k)! Since j and lk have high magnetic
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permeability of the ferromagnetic bodies (5 ? ?) and (5j ?), they are easily led to the
ferromagnetic bodies (5j) and (5j ?) and formed. Furthermore, since the superconductor (6j) is
provided between the ferromagnetic members (5j) and (5j '), the magnetic fields lj and lk are
generated by the diamagnetic action of the superconductor (6j). It can not pass through the
inside of the superconductor (6j), in other words, the magnetic fields lj and A are mutually
blocked by the superconductor (6j). Therefore, as described in the section of the conventional
electromagnetic ultrasonic probe, when there is no ferromagnetic material between the magnet
segments (2j) and (2k), the adjacent magnetic poles are different poles. In order to attract
between the magnet segments (2j) and (2k), the component of the magnetic field passing through
the inside of the test material (4) in the magnetic field by each magnet segment is reduced. In the
electromagnetic ultrasonic probe, the magnetic fields Aj and lk are guided to the ferromagnetic
members (5j) and (5j ') and completely blocked from each other by the superconductor (6j) IC, as
shown in FIG. (B) The magnetic field due to each magnet segment at K is such as the magnetic
field due to a single magnet segment as shown in FIG. 2 (a). It is completely formed to pass
through the inside of the test material (4), and as a result, a magnetic flux orthogonal to the
surface of the test material (4) is effectively generated. [Effects of the Invention] As described
above, according to the present invention, the superconducting rod is sandwiched between all
the magnet segments by the nine ferromagnetic members, and the magnet segments and the
ferromagnetic members are provided adjacent to each other. From K, the magnetic field by each
magnet segment is guided to the ferromagnetic body to form a magnetic path passing through
the inside of the test material, and orthogonal to the surface of the test material necessary for
generating Lorentz force that is the source of ultrasonic vibration. Magnetic flux is generated,
and by the diamagnetic action of the superconductor. Since the magnetic fields passing through
the ferromagnetic bodies on both sides of the superconductor can not mutually attract each
other, the magnetic fields by the respective magnet segments are effectively formed to have
components orthogonal to the surface of the test material, and as a result, Lorentz force
generation occurs. It has the effect of improving the strength.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing an electromagnetic ultrasonic probe according to an embodiment of the
present invention, and FIG. 2 is a view for explaining the features of the electromagnetic
ultrasonic probe according to the present invention, FIGS. 3 and 4 Fig. 5 is a view for explaining a
conventional electromagnetic ultrasonic probe, and Fig. 5 is a view for explaining the principle of
oblique incidence of a transverse wave by the electromagnetic ultrasonic probe of the prior art
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and the present invention. ) Is a magnetic field generator, (2a) to (2y) is a magnet segment, (3) is
a coil, (5a) to (5x) and (5a ') to (5X1) are ferromagnetic materials.
(6a) to (6x) are superconductors. In FIG. 1, the same or corresponding parts are indicated by the
same reference numerals.
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