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Patent Document 1, Title of the Invention 2, 4 Claims to a ring-shaped ultrasonic transducer
having a hole at the center, a plastic circular wedge having the hole and a hole at the center of
the hole at the hole Overlap and close contact, a cylindrical ultrasonic absorber is provided at the
position of the hole, and the ultrasonic beam emitted from the transducer through the liquid
through the liquid is focused in a linear shape. Ultrasonic transducer.
Ultrasonic transducer
Detailed Description of the Invention The present invention tI11 relates to a water immersion
ultrasonic transducer capable of linearly focusing an ultrasonic beam and lengthening the
focused beam. Recently, the size of the detection defect when performing ultrasonic wave flaw
detection. There is a strong demand for further shortening the inspection time while
simultaneously improving the accuracy of defect evaluation by directional quantitative
measurement. Therefore, it is necessary to focus on a large beam which accurately determines
the position of the defect, and in order to shorten the inspection time, it is desirable that the
above-mentioned beam focusing be in a straight line. When an ultrasonic wave is emitted to the
material to be inspected, it is necessary to avoid the influence of the reflected wave (8 echoes)
from the surface. However, in the conventional vertical immersion probes for water immersion
conventionally used, the ultrasonic beam depends on the frequency and diameter of the
transducer, so it can not be narrowed to a certain limit and it can not be f The narrowing of the
ultrasound beam as a child was short of the focusing band and was equivalent to one point. In
addition, when using a split probe to avoid the influence of S echo, usually a six split probe is
used, and a transducer with strong directivity and the same area is used for transmission and
reception because of the probe structure. Compared to the above, there is a loss in sensitivity, as
shown by the fact that transmission and reception are performed with a transducer of half the
area. The present invention has been made to solve the above-mentioned problems, and the
ultrasonic beam emitted from the transducer is linearly focused on the test material and its
focused EndPage: line length is An object of the present invention is to provide an ultrasonic
transducer that can be made equal to the thickness of a test material. The invention will now be
described with reference to an embodiment shown in the drawings. FIG. 1 shows an ultrasonic
transducer having a hole in the center. FIG. 2 is a cross-sectional view of the ultrasonic
transducer according to the present invention, in which 1 is a piezoelectric ceramic or single
crystal; an ultrasonic transducer with a large diameter, and an empty hole of the ultrasonic
transducer in the center of 2 # i Sound absorber made of circular plastic wedge with holes with
constant slope 7 on the inner side, 3Fi epoxy elastomer, butyl rubber, phenol resin etc. mixed
with sound absorbing filler etc., 4 is tungsten, Damper from epoxy composites. 5Vi electrical
connector, 6Fi ultrasonic transducer 1 lead wire to connector 5, 8 is the case. The hole in the
center is aligned with the m-shaped vibrator 1 and the plastic circular shape @ 2 is brought into
close contact, and the cylindrical sound absorber 3 is fitted in the hole of the vibrator 1 and the
bare 2 described above. The case 4 is loaded with a damper 4.
Such an ultrasonic transducer is illustrated in FIG. 5 in one section perpendicular to the material
to be inspected, for example, the steel longitudinal axis 11 in water. Now, the ultrasonic wave 15
is emitted from the ultrasonic transducer 1 to the outermost water in the outermost surface of
the inclined surface 7 of the plastic circular wedge, and the echo (S echo) 16 'generated from the
interface of the steel plate 11 is the wedge 2 and the ultrasonic wave. The sound absorption body
6 is absorbed through the outermost part of the pores of the vibrator 1, but a part of the
ultrasonic wave 15 is incident on the steel plate, and is reflected (S echo) on the bottom surface
15, and the ultrasonic wave 1y from the steel plate to water Travels to the outside of the circular
wedge 2 ', and then the ultrasonic wave 14 emitted into the water from the innermost side of the
inclined face 7 of the circular wedge is reflected as an S echo through the dead zone of the steel
plate. 'Is the other side of the fence I! The angle of the inclined surface of the circular wedge and
the size of this $ 2 and the central hole of the ultrasonic transducer 1 so as to be incident and
absorbed by the inner inner absorber of the inclined surface of 2 ' If it is selected, it is possible to
totally inject the light into the OBS echo sound absorber 3 and to avoid the influence thereof.
This makes it possible to make the undetectable zone dead zone extremely small. Also, S echo can
not be received. Now-as an example, in FIG. 4, the thickness T of the steel plate = iom, the
diameter 2R of the transducer = 20 ", the speed of sound CW = 1500 v" in water, Ca in organic
glass = 2740! The inclination angle φa of the weir is determined as n / ′ ′ and cs = 5200 m /
′ ′ in steel (transverse wave). Therefore, when using a transverse wave with a short
wavelength so as to increase the resolution so that flaws as small as possible can be detected, the
conversion efficiency of the transverse wave that is generally incident on the steel sheet from
water becomes MAY when the incident angle is 17) The inclination angle φ of the crucible is
calculated as 4h = 170, so that the thickness of the circular dust is A = 3.1629 . The radius of
the dust hole H = 4.9929 ". As shown in FIG. 3, when an ultrasonic beam is emitted to the test
material of a certain thickness at a certain distance from the ultrasonic transducer which is
submerged in water, the ultrasonic beam incident on the test material is once a line It is focused
on 16 and progresses further respectively. Therefore, if there is a flaw on the line 16 as well, the
probe spot is extremely clarified by the bundled ultrasonic beam, and the resolution i / 1 m +
with respect to the position can be remarkably improved and the flaw sensitivity You can also
open it. Since the area from the surface to the bottom of the material to be inspected which can
not be detected by the point-holcasing probe can be detected at one time, when inspecting the
whole shelf board, scanning the probe should be performed only once. Good.
Therefore, the inspection time can be further shortened.
4, representing the simple description of the drawings, FIG. 4 is an explanatory view of a specific
example. 1 ... annular ultrasonic transducer, 2 ... circular wedge, 3 ... sound absorber, 7 ... inclined
surface of circular wedge, 11 ... inspection material. 12 · · · ultrasonic vibration "hole of the
motion patent patent applicant Tokyo Keiki Inc. End Page: 211 111 Figure 3 Figure 2 EndPage:
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