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JPH01148960

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DESCRIPTION JPH01148960
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
focusing ultrasonic probe for immersion, particularly an ultrasonic probe suitable for stabilizing a
surface echo trigger position and keeping a gate in a fixed position. About. [Prior Art] FIG. 5 and
FIG. 5 show a conventional focus-type ultrasonic probe (hereinafter referred to simply as a
probe) for immersion (hereinafter mainly described for immersion in water). This will be
described with reference to FIG. FIG. 5 is a side sectional view for explaining the configuration of
the probe, and FIG. 6 is a view showing an example of a flaw detection waveform when the
internal defect of the object is focused. In the figure, reference numeral 1 denotes a disk-shaped
transducer, and 2 denotes an acoustic lens integrated with the transducer 1 on the surface
opposite to the surface attached to the transducer 1, that is, the surface on which the ultrasonic
beam is emitted. Is formed with a concave spherical lens 2a. 3 is a damper attached to the back
of the vibrator 1, 4 is a vibrator 1. Acoustic lens This is a cylindrical case made of stainless steel
with the damper 3 etc. installed, and the connector 5 connected via a high frequency cable to an
ultrasonic flaw detector (hereinafter simply referred to as a flaw detector) (not shown) is
provided at the top of the case 4 ing. po is a probe which consists of the above-mentioned
composition. At the time of flaw detection, first, the focus of the probe po is set on the surface of
the object (not shown), and then the object or probe po is moved by a predetermined depth from
the surface to focus on the depth inside the object. Try to connect In this case, the echo from the
subject displayed on the flaw detector can be obtained at a high level without mutual
interference of surface echoes (hereinafter referred to as S echo) when the above-described focus
is set on the subject surface. When the focus is set to a predetermined depth from the surface,
the waveform of the S echo collapses and the level becomes extremely small due to the mutual
interference of the surface echo, the influence of the surface unevenness, etc., for example, as
shown in FIG. Will be In the figure, T is a transmission pulse, F is a defect echo, and B is a bottom
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echo. When the S echo becomes extremely small like this, the surface echo trigger position
becomes unstable, and the gate position that has been reached to a predetermined depth by the S
echo tracking gate shifts, and a C scope image with high accuracy is picked up by noise. It had
the problem that it could not be obtained. SUMMARY OF THE INVENTION In view of the above
problems, the present invention stabilizes the surface echo trigger position so that a stable S echo
can be obtained, and keeps the gate placed at a predetermined depth at a fixed position. An
object of the present invention is to provide an ultrasonic probe that can be maintained. [Means
for Solving the Problems] In order to achieve the above object, an ultrasonic probe according to
the present invention comprises a vibrator and an ultrasonic beam emitted from the vibrator
inside a cylindrical case. In the case of an immersion focus ultrasonic probe provided in
combination with an acoustic lens for focusing at a single point, a position parallel to the plane of
the vibrator and nearer to the case end face than the vibrator in the case Another transducer is
disposed, and an ultrasonic wave emitted by the other transducer is emitted through a portion
other than the lens surface of the acoustic lens.
An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
FIG. FIG. 1 is a side sectional view of a probe, FIG. 2 is a cross-sectional view taken along the line
II--II in FIG. 1, and FIG. 3 is a view showing an example of a flaw detection waveform by the
probe shown in FIG. In the figure, reference numeral 1 is the same as the transducer in the
conventional probe Pa shown in FIG. 5b, and is a transducer for detecting a reflected wave signal
from the object. Reference numeral 6 denotes another transducer for surface echo trigger
provided parallel to the transducer 1 and at a position closer to the lower end surface 9a of the
case 9 than the transducer 1, and in the case of this embodiment, FIG. As shown in FIG. 2, the
ring shape is concentric with the vibrator 1 around the vibrator 1. An acoustic lens 7 is integrally
formed with the vibrators 1 and 6, and a concave spherical lens surface 7a having a dimension d
substantially equal to the diameter of the vibrator 1 is formed at the center of the lower surface
thereof. Damper mounted on the back of 1 and 6 Reference numeral 10 denotes a connector
provided on the top of the case 9. P is a probe which consists of the above-mentioned
composition. When performing a flaw detection of a predetermined depth from the surface of the
object by the probe P having the above configuration, the transducer 1 and the transducer 6
have different surfaces disposed in the probe P, so the flaw detection waveform For example, as
shown in FIG. 3, S! The echo is first displayed, and then the S echo by the vibrator 1 is displayed.
Since the S1 echo and the S echo have different propagation distances, they are always separated
without being superimposed, and the SI echo is a ring-shaped vibrator 6 even if the distance to
the object is changed to detect the probe P. Since the emitted ultrasonic waves are transmitted
and received through the portion other than the lens surface 78 of the acoustic lens 7, the
waveform is not broken as in the normal vertical probe, and a stable high level waveform can be
obtained. Therefore, if S and echo are used for surface echo trigger, the surface echo trigger
position becomes stable, and therefore it becomes possible to obtain a C scope image with high
accuracy and no noise since there is no shift in the gate position. In addition, since a signal
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immediately below the surface of the object can be gated even if a long delay gate is used, it has
an effect of being able to detect a defect immediately below the surface. FIG. 4 is a view
corresponding to FIG. 2 of the other embodiment, and 11 has a plane parallel to the vibrator 1
and a case 9 to a case 9 like the vibrator 6 shown in FIG. The other vibrator provided at a
position close to the lower end face 9a, in the case of the present embodiment, a circular vibrator
is disposed at an arbitrary position around the vibrator 1. In the case of the present embodiment,
the function and effect are the same although there is some decrease in sensitivity due to the
smaller transducer size compared to the case of FIG.
[Effects of the Invention] As described above, the ultrasonic probe according to the present
invention is an ultrasonic probe for immersion immersion type, in which a vibrator for detecting
a reflected wave signal from an object is provided in a case The other transducer for surface echo
trigger is arranged in parallel, and the other transducer is placed close to the end face of the
case, and the ultrasonic wave emitted by the other transducer is a portion other than the lens
surface of the acoustic lens Since the configuration is such that emission is performed via the
circuit, a high level stable S echo without waveform collapse can be obtained, and the surface
echo trigger position can be stably kept at a fixed position for a predetermined depth. Play an
effect.
[0002]
Brief description of the drawings
[0003]
1 to 4 are detailed explanatory views of the present invention, FIG. 1 is a side sectional view of a
probe, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a flaw detection waveform FIG. 4 is a
diagram showing an example, and FIG. 4 is a diagram corresponding to FIG. 2 of another
embodiment.
FIG. 5 is a side sectional view of a conventional immersion focus type probe, and FIG. 6 is a view
showing an example of a flaw detection waveform by the probe shown in FIG.
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