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JPS582744

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DESCRIPTION JPS582744
[0001]
The present invention relates to improvement of directivity of an ultrasonic transducer that
generates or detects ultrasonic waves electromagnetically. Heretofore, there has been shown an
ultrasonic transducer of this type as shown in FIG. In the figure, 1 is an iron core, 2 is a magnetic
field generating coil wound around the iron core 1, 3 is a generating coil disposed on the lower
surface of the iron core l, and as shown in FIG. ing. Reference numeral 4 denotes a conductive
test material that generates ultrasonic waves. Next, the operation will be described. When a
direct current is supplied to the magnetic field generating coil 2, a magnetic field as shown in
FIG. 1B is generated in the vicinity of the surface of the test material 40. On the other hand, when
a current as shown in FIG. 1 is applied to the generating coil 3, an eddy current is generated in
the vicinity of the surface of the inspection object 4. The interaction between the eddy current I
and the magnetic field B causes a force such as F to work. It propagates as a shear wave. The
ultrasonic wave sound source of this transverse wave can be regarded as a □ sound source that
performs piston movement of the same size as the generating coil 3 on the surface of the
inspection material 4 facing the # 1 generating coil 3. In such directional characteristics of the
sound source, a secondary rope S is generated in addition to the main rope M as shown in FIG. In
the above description, generation of ultrasonic waves has been described, but detection of
ultrasonic waves is performed on the reverse principle. As described above, the conventional
ultrasonic transducer has a drawback that due to the directivity characteristic, the secondary
rope is generated and the flaw detection etc. of the test material can not be performed correctly.
The present invention has been made to eliminate the disadvantages of the prior art as described
above, in which the winding density of the stop coil is made dense on the inside and coarsely
wound on the outside, and the small direction of the secondary rope is pointed out. The purpose
is to improve the characteristics and provide nine ultrasonic transducers. An embodiment of the
present invention will be described below with reference to the drawings. In FIG. 4, 1 is an iron
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core, 2 is an iron core IK, and a coil for generating a 9 magnetic field, and 4 is a conductive test
material for generating an ultrasonic wave, which is the same as the conventional one. Reference
numeral 3 & is a generation coil disposed on the lower surface of the iron core 1, and this
generation coil 3a is spirally wound as shown in FIG. 5, but is tightly wound inside and
roughened outside I'm changing the winding density. FIG. 7 shows directivity characteristics
according to the present invention, where M is a main rope and -S is a secondary rope. Next, the
operation of the present invention will be described, but before that, the cause of the large
secondary rope S of the directional characteristics of the conventional one will be described. In
the prior art, since the winding density of the generating coil 30 is uniform, the density of the
eddy current generated in the vicinity of the surface of the test material 4 when the current is
supplied to the coil 3 is also uniform in the portion facing the generating coil. .
The magnetic field B is also uniform. Accordingly, since the force F generated on the surface of
the inspection material 4 is also uniform, the secondary rope S is theoretically generated as a
sound source for piston movement. By the way, according to the present invention, since the
winding density of the generating coil 3 & is dense on the inside as shown in FIG. 5 and is
roughly wound on the outside as shown in FIG. The inner density of II is greater than that of
inner II. On the other hand, the magnetic field B is uniform. The internal reconnaissance I inside
the force Fa generated on the surface of the material to be inspected eventually becomes larger.
This “distribution is as shown in FIG. The distribution shape of FIG. 6 can be changed by the
density distribution of the winding method of the generating coil 3a. In the field of ultrasonic
transducers, it is known that the secondary rope is suppressed when the central part and the
peripheral part are vibrated weakly, and an excitation distribution that minimizes the secondary
rope is required. Therefore, according to the present invention, since the force acting on the
surface of the material to be inspected is smaller at the central portion and at the peripheral
portion, the side lobe is smaller than that of the conventional one. This situation is shown in FIG.
Further, if the ratio of the winding density of the generating coil 3a to be roughened from the
inside to the outside is appropriately determined, it is theoretically possible to obtain a small
directivity characteristic of the secondary rope. In addition, although generation | occurrence |
production of an ultrasonic wave was shown in the Example, also in the case of a detection, it can
implement by the same principle. Further, although the embodiment shows the case where the
magnetic field B is perpendicular to the surface of the material to be inspected and generates a
transverse wave, it can be applied to any mode. C is also applicable to the generation of
longitudinal waves without using the magnetic field B, and the generating coil has been shown to
be circular although it may be of another shape depending on the application. Other permanent
magnets may be used. As described above, according to the present invention, the winding
density of the generating coil for generating or detecting the eddy current on the surface of the
test material is made denser at the inside, and the outer extension is coarsely wound, so that A
small directivity characteristic can be obtained, which has the effect of increasing the accuracy of
measurement of the ultrasonic transducer of the test material without the addition of an external
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device.
[0002]
Brief description of the drawings
[0003]
1 is an explanatory view of a conventional electromagnetic ultrasonic transducer, FIG. 2 is a plan
view of a generation coil, FIG. 3 is a directional characteristic view, and FIG. 4 is an explanatory
view of an ultrasonic transducer according to the present invention Fig. 5 is a plan view of the
generating coil.
FIG. 6 is a distribution diagram of the force acting on the surface of the test material, and FIG. 7
is a directivity characteristic diagram. 1 ... iron core, 2 ... magnetic field generating coil, 3 m ...
generating coil, 4 ... test material. In the drawings, the same reference numerals denote the same
or corresponding parts. Agent Shin Nono-Fig.3-Fig.5 Fig.6 Fig.7 Procedure Amendment (No.1)
Patent Office Secretary 3, Person who makes amendment 5, Field for claim of the specification
subject to amendment 6. Details of the amendments The description of the claims in this
application will be corrected on a separate sheet. L Braces (1) in the attached document
Corrected claim 1 or more magnets that apply a magnetic field to the surface of the test material
having a conductive surface, and generation or detection of eddy currents on the surface of the
test material In the electromagnetic ultrasonic transducer provided with soil, the winding density
of the generating coil is tightly wound on the inner side of the coil and coarser on the outer side.
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