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DESCRIPTION JPS5994990
[0001]
The present invention relates to an ultrasonic probe used for nondestructive inspection, medical
diagnosis and the like. For example, as shown in FIG. 1, a conventional ultrasonic probe in a ridge
of a ridge has a backing material (3) on one acoustic radiation surface (2) of 1 flat ultrasonic
transducer). ) ヲ provided. A single or multi-layered sound box impedance transformation layer
14) is provided on the other writing radiation surface (2). (1) Egg fluid In examination and
medical examination ml, supersonic tIi which transmits / receives an ultrasonic wave efficiently
in the sample. It goes without saying that a probe is required. In the conventional ultrasonic
probe of this ridge, the ultrasonic transducer excited by the ultrasonic transducer propagates not
only in the 2M inspection direction but also in the backing material (3) direction. That is, in the
conventional ultrasonic probe of this type, it is not possible to avoid the bother of the acoustic
power radiated into the backing material 13), and therefore, the efficiency is poor. In the present
invention, two ultrasonic transducer crests are disposed apart from each other by a length of
four, and the excitation and reception signals of one of the ultrasonic probe crests and the phase
of the other ultrasonic transducer c A phase difference of 90 degrees is provided between the
excitation and the reception signal so that ultrasonic waves are transmitted and received in the
same phase in the direction of the test material and in the opposite phase in the direction of the
backing material. This solves the above-mentioned conventional drawbacks, and will be described
in detail using an embodiment shown in FIG. 2 under PL. In FIG. 2, 11) is the same flat plate-like
two ultrasonic transducers as in the prior art, and the ultrasonic limpet protein has an
intermediate layer 15) having a thickness of 1 L wavelength. The sound emission planes (2) of
each supersonic wave (2) Gifu mover (1) are arranged so as to face each other. (3) is the same
backing material as the conventional one. (4) is an acoustic impedance transformation layer
similar to the conventional one provided between the test material and the ultrasonic transducer
pile. Now, in the ultrasonic probe according to the present invention. The phase of the @
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vibration signal of the ultrasonic transducer crest approaching the test material is delayed by 90
degrees with respect to the phase of the excitation signal of the ultrasonic transducer crest
approaching the backing material (3). For example, since the ultrasonic wave excited by each
ultrasonic transducer crest is provided with an intermediate layer 15 having a thickness of 1⁄4 lR
between two ultrasonic transducer crests, Transmit in the same phase. On the other hand, it is
transmitted in the reverse phase in the backing material (3). That is, in the ultrasonic probe
according to the present invention, the acoustic power is efficiently radiated into the test
material, and the acoustic power radiated into the backing material 13) is smaller than that in the
prior art.
Therefore, there is an advantage that the efficiency can be improved as compared with the
conventional ultrasonic probe of this type. Although the above has described the case of exciting
the ultrasonic transducer crest (3), the same applies to the case of receiving an ultrasonic wave,
and it is apparent that the efficiency can be improved in this case as compared with the
conventional case. Although two or more described the case of the embodiment shown in FIG. 2,
the present invention is not limited to this, and not only a flat plate as the ultrasonic transducer
+11 but a curved one is used 7 ') : It will be clear that similar advantages can be obtained in some
cases. It may be applied to an oblique ultrasonic probe which transmits and receives ultrasonic
waves obliquely with respect to the surface of a test material by using '1st order, a wedge or the
like. As described above, in the ultrasonic probe according to the present invention, the two
ultrasonic waves t11 and the moving element il + are arranged at a distance of 1⁄4 of each other,
and the excitation and reception signals of one ultrasonic transducer 111 Giving a phase
difference of 90 degrees between the phase of the second ultrasonic transducer, the excitation of
the other ultrasonic transducer pile and the phase of the received signal The fact that the
ultrasonic waves are transmitted and received in the same phase in the direction of the test
material and in the opposite phase in the direction of the backing material has an advantage that
the efficiency can be improved as compared with the prior art when transmitting and receiving
ultrasonic waves. （４）
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing a conventional ultra-old S probe, and FIG. 2 is a view showing an
embodiment of an ultrasonic probe according to the present invention.
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In the figure, a mountain is an ultrasonic transducer, (2) is an acoustic radiation surface of the
ultrasonic transducer, (3) is a backing material, (4) is an acoustic impedance transformation
layer, and +5) is provided between ultrasonic transducer peaks. It is an intermediate layer. In the
two figures, the same or common parts are indicated by the same reference numerals. Agent
Shino Hino-(5J-Figure 1 Figure 2
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