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JPS6315157

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DESCRIPTION JPS6315157
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
focusing probe for immersion using a vertical probe, and is particularly suitable for combining
the vertical probe and the focusing probe. [Background Art] A focus probe has hitherto been
mainly used in the water immersion method, and various usages utilizing characteristics have
been devised in accordance with the size, shape, etc. of the subject to be the target. This is mainly
due to the fact that the ultrasonic waves emitted from the focusing probe to the subject use the
property of focusing within the subject, and the increase in sound pressure at the focus enhances
flaw detection sensitivity, and the accuracy of fine defects is also high. It is because it makes it
possible to measure well. By the way, a conventional focus probe generally has a structure in
which the flat side of a plano-concave lens is directly bonded to a disk-shaped vibrator, and a
sound wave emitted from the vibrator is one point by a lens (hereinafter referred to as an
acoustic lens). In the so-called point focusing type of focusing, the focal length of the focusing
probe is constant, and the depth of focusing from the surface of the subject is constant according
to the material of the subject. The flaw detection range that can be measured by the focus probe
is limited to, for example, a material with small attenuation of ultrasonic waves, or a so-called
thin material with a small thickness dimension. Therefore, in the immersion method, one normal
vertical probe or oblique angle probe is used out of the range which can be measured by such a
focus probe, but in the same manner as in the case of the focus probe, A probe corresponding to
the material, thickness, etc. of the subject is required. As described above, the range that can be
measured by the focus probe and the range that can be determined by the vertical probe and the
like are different, and when measuring the object in each range, the focus probe and the vertical
probe must There is a problem of having to prepare separately and becoming expensive.
[Problems to be Solved by the Invention] As described above, conventionally, the range that can
be measured differs between the focusing probe and the vertical probe depending on the
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material, thickness dimension, etc. of the subject. In the case of measuring an object, it is
necessary to separately prepare the focus probe and the vertical probe, which causes a problem
of many expenses. The present invention solves the problems of the prior art, and provides a dual
purpose focusing probe that can be used as a focusing probe by using a vertical probe that can
be used independently. The purpose is to [Means for Solving the Problems] The present invention
forms a bottom surface of a cylindrical case having a bottom surface at one end side and having
a mirror surface roughness on the inside into a point focusing type acoustic lens, and the case is
The vertical probe is focused by attaching the vertical probe to the acoustic lens so that the
vertical probe can be attached to the inside in a removable manner and the liquid is injected to a
position where the fitted vertical probe is immersed. It can be used as a probe and can also be
used as an independent vertical probe by removing the vertical probe from the case.
[Function] A liquid (for example, water etc.) is injected as a medium into a cylindrical case whose
bottom is formed into a point focusing type acoustic lens, and a vertical probe detachably
mounted in this case is inserted. If, for example, a pulse voltage is applied from the ultrasonic
flaw detector to the vertical probe while immersed in the medium, the emitted ultrasonic waves
reach the acoustic lens through the medium, and the curvature radius of the acoustic lens set
there And refract to correspond to the speed of sound of the medium inside and outside the case,
focusing the ultrasound beam to the calculated focal length. Therefore, by matching the focal
length to the measurement surface of the subject, it can be used as a focusing probe, while the
vertical probe can be used as an independent vertical probe removed from the case.
[Embodiment Example of the present invention will be described with reference to the drawings.
In the figure, 1 is a case, and the case 1 has a bottom surface 2 and a cylindrical cylindrical shape
with one end of the ice-containing 1 open, and the inside has an inner circumferential surface 3 a
perpendicular to the bottom surface 2. A screw 3 b is machined on the inner peripheral surface 3
a on the open end side of the case 1, and screwed with the screw 6 provided on the outer
periphery of the vertical probe 5 in a state where there is no backlash Can be locked at any
position in the case 1 and can also be removed from the case 1. The bottom surface 2 is formed
of a point focusing type acoustic lens having a spherical surface 4, and the material 2 radius of
curvature, the lens shape, and the like are selected so as to be a predetermined focal length. The
inner peripheral surface 3a of case 1 has a mirror-like surface roughness in order to reduce
reflection loss due to surface roughness, and in order to ensure this surface roughness, case 1 is
made of quartz glass, aluminum alloy or the like having homogeneity. Made. The thickness
dimension of the case 1 is about II to 2 m in consideration of processability, portability, acoustic
properties, and the like. Since the vertical probe 5 can be locked at an arbitrary position in the
case 1, the distance to the bottom surface 2 can be set to any distance at which the plane wave
can be obtained on the bottom surface 2 although it varies depending on the transducer diameter
and frequency. When the vertical probe 5 to be used is fixed, if a step is provided at a
predetermined position in the case 1 and the vertical probe 5 is screwed up to the step, a
predetermined predetermined distance up to the bottom surface 2 is always obtained. Will be
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obtained. Reference numeral 7 denotes a liquid injected into the case 1, and usually, water is
used, but other different liquids are injected as a medium according to the type of the subject 9
or the like. The liquid 7 used is one free of dirt and air bubbles and is injected to a position where
the vertical probe 5 is immersed. When a pulse voltage is applied to the vertical probe 5
configured in this way from an ultrasonic flaw detector (not shown), the emitted ultrasonic waves
propagate through the liquid 7 and reach the bottom surface 2 formed in the acoustic lens, The
ultrasound beam is focused to a focal length calculated in advance, with refraction corresponding
to the set radius of curvature of the spherical surface 4, the sound velocity of the bottom 2, and
the sound velocities of the liquid 7 and the liquid 8.
The vertical probe 5 can be used as a focusing probe by focusing on the measurement position in
the subject 9 in consideration of the focal length and the refraction angle of the subject 9. In this
case, when used in combination with a case where the material, curvature radius, etc. of the
acoustic lens formed on the bottom surface 2 are variously changed, different focal lengths can
be obtained, and it becomes possible to detect different objects. On the other hand, since the
vertical probe 5 can be freely removed from the case 1, it can be used for a different subject
other than that used as a focusing probe as an independent vertical probe. [Effects of the
Invention] As described above, according to the present invention, the vertical probe is
detachably fitted to the acoustic lens in a cylindrical case having a bottom surface formed into a
point focusing type acoustic lens, and then fitted. The vertical probe can be used as a focusing
probe because it is a focusing probe of a configuration in which the liquid is injected to a position
where the mounted vertical probe is immersed. On the other hand, the removal of the vertical
probe from the case has a notable effect on practical use that can also be used as an independent
vertical probe.
[0002]
Brief description of the drawings
[0003]
The drawings illustrate one embodiment of a focus probe according to the present invention.
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