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DESCRIPTION JP2001119772

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DESCRIPTION JP2001119772
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of an ultrasonic transducer of an underwater transducer.
[0002]
2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 9271473, in an ultrasonic imaging apparatus, a plurality of elements are connected by a link
mechanism to change their arrangement in order to obtain a three-dimensional image. The
scanning is performed by moving the convergence point of the whole sound wave by the above,
but it is necessary to accurately maintain the relative position of the elements. In JP-A-9-297125,
the ultrasonic mask is moved in the direction of the normal to the measurement surface to detect
a reflected beam at a desired incident angle. It is necessary to move the pedestal for holding the
feeler, and to obtain a large scanning range, it is necessary to move the pedestal largely.
[0003]
SUMMARY OF THE INVENTION It is an object of the present invention to obtain a threedimensional image of a target by obtaining a large scanning distance of the convergence point of
sound waves without moving the pedestal of the ultrasonic probe. However, in the above prior
art, since the scanning is performed by moving the convergence point of the sound wave by the
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link mechanism, the degree of convergence of the convergence point of the sound wave is
reduced due to backlash or mounting error caused by wear of the link sliding portion. There is a
drawback of falling.
[0004]
The object of the present invention is to solve the above-mentioned problems, and the object of
the present invention is to achieve a large scanning distance of the convergence point of the
sound wave without lowering the resolution to obtain a three-dimensional image of the target. It
is an object of the present invention to provide an ultrasonic probe characterized in that it can
obtain material information with high accuracy and can be searched.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, an acoustic lens movable in front of an ultrasonic element is provided without
providing a link mechanism, and By moving and scanning the convergence point of the sound
wave on the ultrasonic target, the three-dimensional shape of the target can be searched, and the
convergence point of the sound wave is converged to the inside of the target to make the
material information of the target It is characterized in that it can be explored.
[0006]
That is, as described above, in the ultrasonic probe of the present invention, the threedimensional shape of the target can be searched, and the convergence point of the sound wave
can be converged inside the target to search for the material information of the target.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described based on the drawings.
The external view of the whole structure of the ultrasound probe which applied this invention to
FIG. 1 is shown.
In FIG. 1, the ultrasonic probe according to the present invention drives a piezoelectric element 1
for transmitting and receiving ultrasonic waves, an acoustic lens 2, a moving device 3 for moving
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the acoustic lens up and down, left and right, and a moving device 3. The driving device 4
includes a detection device 5 that detects the movement distance of the acoustic lens 2.
[0008]
The piezoelectric element 1 is made of, for example, a piezoelectric material such as PZT or
PVDF, and transmits sine-wave or pulse-like ultrasonic waves by vibrating in a sine wave or pulse
shape by being excited by alternating voltage or pulse voltage. is there.
The piezoelectric element 1 can also receive ultrasonic waves reflected by the object of the target
6.
[0009]
The acoustic lens 2 is moved by the moving device 3 and the driving device 4 in the plane and in
the axial direction perpendicular to the axis connecting the piezoelectric element 1 and the object
of the target 6. The sound wave can be converged at an arbitrary point on or in the object. At this
time, the movement distance of the convergence point of the sound wave can be obtained by
measuring the movement distance of the acoustic lens. Since the ultrasonic energy is maximum
at the convergence point of the sound wave, the reflection echo is maximum when the
convergence point of the sound wave is on the surface of the object of the target 6. If the
acoustic lens 2 is scanned by searching for this maximum point, the object shape of the target 6
can be obtained from the movement coordinates of the acoustic lens 2.
[0010]
A method of obtaining the shape of the object by moving the acoustic lens 2 and scanning the
convergence point of the sound wave will be described with reference to FIGS. 2 and 3. FIG. 2
shows an example of the relationship between the amount of movement of the acoustic lens 2
and the amount of movement of the focal point when the acoustic lens 2 is moved in a plane
perpendicular to the axis connecting the piezoelectric element 1 and the object of the target 6 It
is. Assuming that the magnification of the acoustic lens is n, and the movement amounts of the
acoustic lens in the horizontal and vertical directions in the plane perpendicular to the axis
connecting the piezoelectric element 1 and the target object are Δx and Δy, respectively, the
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convergence points of the corresponding sound waves The movement amounts ΔX and ΔY of
can be respectively expressed by
[0011]
ΔX = n (Δx + 1) (1)
[0012]
ΔY = n (Δy + 1) (2) Further, when the acoustic lens is moved by Δz in the axial direction as
shown in FIG. 3, assuming that the focal length of the acoustic lens is f, the movement amount
ΔZ of the convergence point is Is represented by
[0013]
Δ Z = (1-f 2) Δ z (3) As long as the acoustic lens is moved in the x-axis, y-axis, and z-axis
directions of the three-dimensional space as described above, , The object shape of the target can
be grasped.
Furthermore, it is also possible to recognize the internal shape of the object if changes in the
intensity of the reflected echo are obtained by aligning and scanning the convergence point of
the sound wave inside the object.
In this case, for example, an identification algorithm using a neural network is used.
[0014]
According to the present invention, the three-dimensional shape of the target of the ultrasonic
probe can be searched, and the convergence point of the sound wave can be converged to the
inside of the target to search for the material information of the target.
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