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JPS555570

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DESCRIPTION JPS555570
Description 1, title of the invention
, Ultrasonic ultrasonic transducer
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer suitable for use in underwater detection using a plurality of frequency signals. When
underwater detection is performed using multiple frequency signals, the ultrasonic transducer
must use a separate transducer for each frequency. Therefore, it is expected that the
arrangement form of the transducers will be extremely large. In this case, as shown in FIG. 1, the
transducers are annularly arranged to constitute a transducer, and the transducers for each
frequency are annularly arranged concentrically with T11 Tl + Tl, whereby the entire transducer
is relatively miniaturized. can do. When the transducers are arranged in a ring, their directivity
characteristics are expressed by X = deep blood ? in the zeroth-order Bessel function RJ, (X).
However, D indicates the diameter ? of the annular vibrator, and the wavelength ? of the
ultrasonic wave indicates an angle ? with respect to the central axis of the annular vibrator. FIG.
2A shows the Bessel function Jo (X) of zero order, eg, Je (0) = t. It has maximum and minimum
values of Jo (fifth 8) == 1402 Jo (7, o) ? = CL 500. And JoC five B) =-[1402EndPage: 1 Jo (7, 0) =
0.4! ?00? indicates a relatively large sub-pole in the synthesized directivity characteristic, and
the azimuth ? at that time is ?17, G?? (X = ?) = ? -5-? (X = 7.0) = gm, 1 Required). As is
clear from this, when the transducers are arranged in a ring, relatively large sub-poles are
generated, so that ultrasonic signals are transmitted and received in unnecessary directions. The
present invention provides an ultrasonic transducer which can be suppressed to such an extent
that it can not be supported practically in all by using the annular array vibrator as described
above. An embodiment of the present invention will be described below with reference to FIG. , 2.
, 2. Denotes a concentrically annularly arranged ultrasonic transducer. The transducer z0 is
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annularly arranged with a radius D / 2, and the transducer z is arranged with a radius D / 2n and
a transducer Z8 radius Ds // 2n. And, these transducers 2, -2. , 2. Consider the synthetic
directional characteristics of In the Bessel function of R, JoCX), it is represented by X = -sfn? ...
pa ... (1) ?-. Similarly, the directivity characteristic of the transducer z1 is X1 = -major ? (2) ?,
also in the zero-order Bessel function R, = + Jo (X,) lD1. Transducer 2. The directional
characteristic of is, in the zero-order Bessel function R1 = JO (Xt), x, =-! ?? 2L-yori ? иииииииииииии (3)
In the equation (2), when D = IIL6D, according to the equations (1) and (2), X1 = 116 X.
Therefore, Rt == Jo (xt) =: r, ((L6K), and the transducer z1 In the directional characteristic of, as
shown in FIG. 2B, a prize ? 6 X =, 5 87.0. Therefore, when X = 6.55.
When D is set to 1.5 D in the equation (3), X, 1.5 X according to the equations (1) and (3).
Therefore, R3 = J0 (Xt): J. (1, 5X) and Cali, transducer 2. As shown in FIG. 2C, the directional
characteristics of are as follows: j, 5X == 58.7.0, that is, when X = 2.55, 4.67, a subpole is
generated. Each characteristic curve of FIGS. 2A, 2B, and 2C corresponds to the transducer zos2,.
Since each directional characteristic is represented, the combined directional characteristic of
these transducers is represented as a combined curve of characteristic curves A, B and C. Then,
when synthesizing each of the characteristic curves A, B, and C, the respective synthesis rates are
as follows: characteristic curve A: 1, characteristic curve B: 0.9. When the characteristic surface
aC is synthesized at [L90 ratio, the characteristic curve is expressed as a fourth design. In FIG. 4,
A 'shows the characteristic curve of FIG. 2A, and B and' C show 0.9 times of the characteristic
curve of FIG. 2B and C, respectively. As is clear from FIG. 4, X = 0. That is, as the characteristic
planes ?? A, B, C are added to each other in the central axis direction of the annular vibrator,
the strongest directional beam is generated. Then, in the direction different from the central axis,
as a result of the respective characteristic curves A, B, C being offset each other, the abradable
beam becomes very small. Then, it was confirmed by calculation that the subpole beam becomes
the smallest with respect to the main pole beam when combining with the above combining rate.
As described above, according to the present invention, transducers can be arranged annularly as
shown in FIG. 5 to form a transducer having a sharp directivity only in a desired direction.
Therefore, in FIG. 5, if EndPage: 2 is arranged with each arrangement radius, transducers of
different frequencies can be arranged concentrically, so that the transducer structure can be
extremely miniaturized. In FIG. 5, the combining ratio of the transducers zO + 21 + 71 may be
combined by weighting the transmission and reception characteristics of each transducer. In the
above embodiment, the transducer Z is used. Although the case where +21 + 'Q is arranged in
five layers has been described, even in the case where the transducers are arranged in two or
four or more layers, the rigid beam can be the same as above by appropriately setting the
arrangement radius and the synthesis rate Can be suppressed.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a transducer arrangement,
FIG. 2 shows a diagram for explaining its directivity characteristics, FIG. 5 shows an embodiment
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of the present invention, and FIG. The figure for demonstrating the directivity characteristic is
shown. 1) ? 21 3) ? ? EndPage: ?
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