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JPS57179160

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DESCRIPTION JPS57179160
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a and FIG. 2a are sectional views of a
conventional ultrasonic split probe, and FIG. 1b and FIG. 2 are conventional ultrasonic split
probes. 3a and 4a are sectional views of an ultrasonic split probe having an acoustic shield plate
made of a flexible material according to the present invention, and FIG. 3b and FIG. FIG. 4 is a
flaw detection waveform diagram when the ultrasonic split probe according to the present
invention is used. In the figure, 1 is a transmitting transducer, 2 is a transmitting delay line, 3 is a
receiving transducer, 4 is a receiving delay line, 5 is a first acoustic shield plate, 6 is a probe case,
7 is a shoe, 8 is a test material, 9 is a water film, 10 is a transmission pulse, 11 is a surface
penetration echo, 12 is a bottom surface echo, 13 is a noise echo, and 14 is a second acoustic
shield plate. The same reference numerals are given to the middle part of the drawing or the
corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of an
ultrasonic split probe for detecting defects in a test material using ultrasonic waves) (1) 647-Ka /
77 / "First of all A conventional ultrasonic split probe will be described with reference to FIGS. 1
(a), (I and FIGS. 2 (a), (→). 1 (a) and 2 are cross-sectional views of a conventional ultrasonic split
probe, and FIG. 1 (a and 2 (showing a flaw detection waveform (moscope) figure. In FIGS. 1 (a)
and 2 (a), il + is a transmitting transducer, (2) is a transmitting delay line, (3) is a receiving
transducer, (4) is a receiving delay line, (5 Is a sound shield plate made of cork material, (6) is a
probe case, (7) is a shoe for forming a water film (9), (8) is a test material, and (9) is a water film.
In FIG. 1 (b) and FIG. 2 (b), 鱈 is a transmission pulse. 0 is a surface echo echo, a2 is a bottom
surface echo, 01 is a noise echo due to the surface echo-tl The location of the delay line (21, +41
of the ultrasonic split probe) between the test material (8) There is usually a shoe (7) for probe
wear, acoustic coupling stability, etc. A gap of about α5 寵 is provided, in which a water film (9)
is formed. The ultrasonic wave emitted from the transmission transducer (1) reaches the sand /
(2) 48 water film (9) via the transmission side delay line (2) 0 or at the surface of the test
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material (8) It is branched into the ultrasonic wave transmitted to the inside of the test material
(8) and the reflected ultrasonic wave. The ultrasonic wave reflected on the surface of the test
material (8) is reflected several times in the water film (9), reaches the receiving transducer (3)
via the receiving side delay-lab in (4), and this is the surface The ultrasonic wave transmitted to
the inside of the test material (8) becomes an echo of leakage 0 and is reflected by the bottom
surface of the test material (8) and passes through the water film (9) and the receiving delay line
+ 41 again. Then, it arrives at the receiving vibrator (3) and becomes the bottom echo operation.
In the case of the conventional ultrasonic split probe, when the surface of the test material (8) is
flat or convex, the flaw detection waveform is as shown in FIG. And while 1 noise on the surface
of the test material (8) is concave, there is no noise that interferes with the flaw detection
operation between the surface I and the bottom surface echo A, but the flaw detection waveform
is shown in FIG. As shown in the figure, the level of the surface reflection echo aD becomes large,
and a noise echo surface appears between the surface reflection echo a and the bottom surface
echo ridge, and the dead zone 4 which is the flaw detection performance is greatly (· ( 3) There
was a drawback that 49 decreased. This invention significantly improves such conventional
defects, and provides an ultrasonic split-type probe capable of obtaining stable flaw detection
performance (especially dead zone / l) without being affected by unevenness of the test material.
It is
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 3
(a). (Su, Fig. 4 (-), (Details will be described using TI. FIGS. 3 (a) and 4 (a) are sectional views of
the ultrasonic split probe according to the present invention, and FIGS. 3 (l, 4 (showing a flaw
detection waveform (moscope)). In FIG. 3 (-) and FIG. 4 (-), (1) is a transmitting transducer, (2) is a
transmitting delay line, (3) is a receiving transducer, (4) is a receiving delay line, (5) is a first
acoustic shield plate made of cork material, (6) is a probe case, (7) is a shoe, (8) is a test material,
(9) is a water film, a ◆ is this device A second acoustic shield plate made of a flexible material
such as polyurethane rubber or nitrile rubber characterized by the above. Fig. 3 (b) and Fig. 4 (in
effect, aII is a transmission pulse, afi is a surface leakage echo, a hot water is a bottom eco tree(4), t '650-. Since the second acoustic shield plate No. a of the ultrasonic split probe according to
this invention has a length longer than the lengths of the transmission delay line (2) and the
reception delay line (4), the test material (8 When the surface of the) is flat or convex-as shown
in Fig. 3 (,), the second acoustic shield plate a4 is bent, and when the surface of the test material
(8) is concave, Fig. 4 (()) As shown in a), the second acoustic shield plate a4 is extended so that
the water film between the delay lines +21, +41 and the test material (8) of the ultrasonic split
probe can always be sufficiently broken. . Therefore, it is possible to prevent that the flaw
detection performance (dead zone at 4 I, // N)) is significantly reduced due to the unevenness of
the surface of the test material (8). As described above, this invention is an acoustic shield plate
made of a flexible material that is longer than the delay line length of the ultrasonic split probe
(for example, polyurethane rubber, nitrile rubber, etc.) between acoustic shield plates made of all
cork materials By bonding and fixing. A practical ultrasonic segmented probe that can prevent
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the flaw detection performance from decreasing due to the increase of the water film thickness
due to the depression of the test material which is also the largest defect of the ultrasonic
segmented probe (51) It provides a tentacle.
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