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JPS5198055

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DESCRIPTION JPS5198055
Special Executive Director General Palace, B Chok 0 Sun Special Note No. II Page 2 Tokyo 6
Minato-ku Shiba 5-chome No. 33 (No. 423) NEC Corporation Representative I "-Hayashi Koji 108
Shiba 5-chome No. 3381 s * tl * X * un, Minato-ku, Tokyo. 50023094-Japan Patent Office 0,
Japanese Patent Application, Publication No. 51-980550, Japanese Patent Application
Publication No. 51. (1976) s, 28 Japanese Patent Application No. 50-2: 1130 '? (+ Agency serial
number. ???????? "735055 Specification 1, Title of the Invention
Transducer
3. Detailed Description of the Invention The present invention relates to a transducer
arrangement of a transducer which is used in a lift for transmitting or receiving sound and
ultrasonic waves in water. In the case of using sound waves == 7 cri and super wave as a means
of information transmission in water, reflections and noises from the peak surface or the bottom
of the sea are major factors affecting S / N. In general, there are many means for suppressing the
directivity submaximal of the sea surface and the bottom of the transducer as one side. When ti
transducers are arranged in a straight line perpendicular to the sea surface in the mounted state
of the transducer, in order to suppress the sea surface and bottom direction v1'ii homomorphic
submax, the transducer array direction Ct) pointing You should suppress sex @ maximum. As the
means conventionally used for this vfc, there is a method of arranging ik lines of transducers at
equal intervals of 2 minutes and 11 U1 wavelength, a method of applying shading, etc. Then,
since the wavelength becomes longer as the frequency becomes lower, the transducer spacing
becomes larger, and the dimension in the transducer array direction and jlk become larger.
EndPage: 1 and the shading method had drawbacks such as the shading sensitivity becoming
worse due to shading. Therefore, one object of the present invention is to provide a directional
submaximal suppressing transducer in which a large number of transducers are linearly
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arranged, and which is small in amount. Another object of the present invention is to provide a
nine-directional submaximal suppressor child transducer by arranging a large number of
transducers vertically and horizontally on a plane. According to the present invention, when the
transmission / reception prayer wave wavelength of the transmitter / receiver is ?, the
transmission / reception wave formed by arranging a plurality of sets of unit oscillators
composed of two detectors arranged at an interval of ? / 2. A linear array transducer
characterized in that all of the transducers are arrayed on a straight line, and the distance
between the center points of two adjacent unit transducer groups is ? or less. You can get it.
Furthermore, according to the present invention, in the transmitter-receiver in which a plurality
of transducers are arranged in a straight line ** in one plane, the above-mentioned linear array
transmitter-receiver is configured for the wE horizontal direction. A transducer can be obtained.
In order to increase the sensitivity in the positive direction of the transducer, it is necessary to
increase the number of transducers to be arranged. -10,000, in order to suppress the directivity
sub-maximal in the transducer array axis direction, it is necessary to set all the transducer
intervals appropriately, and conventionally, each transducer was arranged at a constant interval
of ? / 2 It is as above-mentioned. The inventors of the present invention have found that
arranging all the transducers at ? / 2 intervals as in this conventional method is not absolutely
necessary for the submaximal pressing in the arrangement direction, from the whole theoretical
examination. I clarified.
In the present invention, a set of transducers in which two transducers are arranged at an
interval of ? / 2 (a unit vibrator pair 5) is used as a basic unit. When this unit oscillator set is
excited with the same phase and the same power, the synthetic sound wave intensity is zero on
the line connecting the two transducers constituting the unit oscillator set. Therefore, when a
plurality of unit transducer sets are arranged so that all the transducers are on the same line, and
each transducer is excited with the homological power, the synthetic sound wave intensity is also
zero on the array axis. If the distance between the transducers constituting each unit transducer
m is ? / 2, the distance to the other transducers is arbitrary. Therefore, the interval between the
transducers constituting the unit oscillator pair to be in a pair may be ? / 2 or less, and further,
the two unit transducer pairs cross each other to form two sets of 10,000 unit transducer pairs.
Even if one transducer constituting the other unit transducer m is interrupted in the middle of
the child, there is no problem. According to the present invention, as described above, shortening
the motional array length by suppressing the submaximals in the arrangement axis direction by
shortening the inter-transducer ? / 2 significantly and reducing the size of the case of
identifying the oscillator t-identification The weight of the transducer can also be reduced
because it enables Next, with reference to the drawings, the transmitter / receiver according to
the present invention INK will be described falsely. FIG. 1 is a cross-sectional view of a
conventional ? / 2 leveling array transducer, and the 64 SI transducers 1, 2 иииииииии 6 ░ are
arranged in a straight line on the front surface of the p1 transducer case 8 It is a thing. The
distance between adjacent vibrators is ? / 2, and the total length of the transducer in the
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peristaltic arrangement direction is at least 5? / 2. FIG. 2 is a cross-sectional view of a
transducer according to the present invention, wherein the transducers 1.2... 6 are arranged in a
straight line. The oscillators 1, 2, 3, 4, 5 and 6 respectively constitute one unit oscillator group,
and their intervals are ? / 2. The distance a1 between the transducers 2 and 3 and the distance
b1 between the transducers 4 and 5 have an arbitrary length of ? / 2 or less. ?11 dl? in this
figure indicates the distance between the midpoints of adjacent unit oscillator pairs, and is
expressed as ?one wavelength ? shorter than Vk 07?, which is sufficiently far from the
transducer on the transducer array axis. 7 '? As one point ?t? A, the oscillator 1.2... r Consider
the sound pressure by the oscillator. The same acoustic energy is transmitted from each
transducer per unit time. Distance k from the point A to the vibrator 1 EndPage: 2 ?? The
amplitude by each vibrator at the ?L 'point is equal to tg, so the sound pressure of the vibrator 1
is P1 = expexp (, + (?t?kx, sound pressure of the lunar vibrator 2) , P snow = working expcj
(?t-k (xg-? / 2)) ? back pressure of the vibrator 3 is p = working exp (j (?t-kx 1 month sound
pressure is P4 = working exp [J (?t:-k (x!
10 ? / 2)) sound pressure of the vibrator 5 is p = exp (j (?t?k О 1 month back pressure of the
vibrator 6 is P = ax pcj (?t?k (z2 + ? / 2)) It is represented as]. However, ? 1 = ?. + ? / 2 +
att?1 = ?l + ? / 2 + b1 @ k is a wavelength base. Here, it is 0 when Pt P Pg is obtained. P, ten
F4. The total synthetic sound pressure at the point of P, + 1F'-mach 7'c1 is 0 and 'fr, and the
point DA is 0. Although the case of transmission has been described above, the same applies to
reception because of the reversibility of the transducer. Therefore, the directivity submaximal in
the transducer array axis direction is completely suppressed. In the present embodiment, the
dimensions of the transducer arrangement direction of the transducer are significantly reduced
as compared with the conventional ? / 2 equidistant arrangement shown in FIG. Further, the
reduction of the transducer array size leads to the downsizing of the case 8 in which the
transducer is fixed and contained, and enables a large external dimension of the transducer. FIG.
3 is a cross-sectional view of a transducer according to a second embodiment of the present
invention, which is "C", and the unit oscillators shown in FIG. It is necessary with 'fc'. Also in this
arrangement, the transducer interval of each unit & motion set is set to ? / 2. However, in the
case of the embodiment shown in FIG. 2, the distance between the middle point of the unit
vibrator set consisting of the vibrators 3 and 4 and the middle point of the left and right vibrator
sets is ? / 2 or more. The distance Cz of ten points is d * k? / 2 or less. Even with this
arrangement, as in the case shown in FIG. 2, the synthetic sound intensity in the & movement
element arrangement axial direction is zero and the submaximal is completely suppressed. The
total length of the transmitter / receiver in the direction of the transducer array axis is shorter
than that shown in FIG. 2 and the apparatus can be miniaturized. FIG. 4 is a cross-sectional view
of a transducer according to a third embodiment of the present invention, which further reduces
the axial length of the transducer array in comparison with the above-described embodiment.
Although the transducer interval in each unit transducer group is 9 ? / 2, the middle point of
the central unit transducer group (formed by the transducers 3 and 4) and the right unit loss
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element m (vibrator 5 and 6) The distance a = to the middle point of (a) is shorter than that
shown in FIG. The total length of the transducer in the transducer array direction is less than ?
and is about 40% of that of the conventional one shown in FIG. 1 and the submaximal is
suppressed in the zero transducer array axis direction where miniaturization is particularly
remarkable Are the same as described above. FIG. 5 shows a planar array of transducers
combining row and column arrangement systems of FIG. 2 and FIG. 3 with directivity #ll J etc. of
row direction (horizontal direction) and column direction (* direction) It is an example of the
arrangement | sequence which was made to suppress.
The figure shows the case where the angle between the row direction and the column direction is
a right angle, or this angle can be traced freely. (9) In the embodiments shown in FIG. 2 to FIG. 5,
the number of transducers arranged on a straight line was six in all. However, if the number of
arrayed oscillators is four or more, that is, the number of sets of unit oscillators is two or more,
the same thing is true and directivity J! It is possible to suppress 111 thick. Further, in the
method of the above-described embodiment, it is not possible to take an arrangement in which a
plurality of transducers constituting the adjacent unit transducer set occupy the same position.
When such an arrangement is necessary, one high-power oscillator is used instead of the samesequence position Kurayoshi @ @ @ number oscillator. The submaximal can be similarly
suppressed if two or more vibrators of k having large power vibrators transmit and receive the
same size as the acoustic energy (per unit time 9) to be transmitted and received.
4, Brief description of the drawings Fig. 1 shows a cross-sectional view of a conventional
transducer #! 2 figures. 3 and 4 show sectional views of the transducer linear array transducer
according to the present invention, and FIG. 5 shows a plan view of the transducer surface array
transducer with (10) EndPage: 3 according to the present invention. Show. In each figure,
reference numerals 1, 2, 3, 4, 5 and 6.7 indicate ffi actuators, 8 indicates a case of an oscillator,
? indicates a wavelength of the number of sounds transmitted and received by the transducer,
and al * a21 astbl + btsba indicates a resonator Any one less than ? / 2 in the distance between
them, '1 + C! + C3 + dlt 62, d is the distance between the midpoints of the unit oscillators and an
arbitrary length 't-smaller than ?. ???????? ?
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