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Nii Ha ( (2,00) ) December 11, 1959 Secretary General of the Patent Office Hideo Hideo Name
of the Shigeo Kawabe 08 To the chances of a good person Yoshio Ki [Facial] Japan Patent Office
■ Open JP-A 51-682550 Japanese Patent Publication No. 51. (1976) f;
Circular hydrophone array
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the directional characteristics of a circular I. idrophone play using individual no idrophones. A
circular hydrophone array is an array of hydrophones having the same sensitivity and the same
characteristics and arranged in a circle at equal intervals in the horizontal plane, and it is used as
a receiver group of sonars in combination with a phase shifter as well known. . Now, the
directional characteristics 2 of the circular hydrophone play of the array number SW # and the
radius R1 @ are as follows. Where 0 is the angle to the direction of the main lobe. 'M-("6 °" //
s))-<1> 69, where f is the transmission frequency and C is the speed of sound in water (tso).
Collective). In equation (1), z (#) (represented by am) is calculated as ljgO, m (Il &) and fxBoO @,
and the results are shown in Table 1 and the solid curve in FIG. In the same figure, there are side
lobes B, O, D, and M of the size of the main sheet with respect to the mains-Bum. According to the
present invention, when the output of the circular hydrophone play is phased in order to reduce
the side lobes, the output of each of the hydrophones is given the characteristic of 1- (co #) 1fk.
The figure shows an embodiment of the present invention, in which l is an I-id p-phone, k is a
phasing device, and 3 is a resistor corresponding to lam (co #) 1. The directional characteristic z
'(#) is then expressed by the following equation. 2 EndPage: 12 items-L set 1 (2) (Knee) l bite [3
ひ-(15 鳴 ム 電 n n / o 6-/-cm (?, J '+ / j "-s)))-- --- ((J J calculated by the same formula as
described above and shown by a column representing the nine results and a broken curve in FIG.
11-i. From this, it will be considerably reduced. Now, in the formulas (l) and (2), the quotient te,
which is the quotient of the area occupied by the portion of the sub-loops IS, O,]) and IIl divided
by the area occupied on the main rope; (2) If (、 I and 1 (1) are substituted for lc and (−month
and 1 (2) (J #) I, respectively, the same quotient ・ · T3 # in the case of 9 is calculated, τ · τ0
JQτe冨 /, JJ JJ 寓 コ 05 丁 S # 冨 /, J'l !? As shown in FIG. 2, even if it obtains te P # by
increasing the multiple p of-and-below, it will become 4 large 10 eventually. In other words,
when one width (Knee) 1 is adopted, the deputy relative to the compensation will minimize the
relative size of the group-can be done at 4 ° C (+ う i! -It turns out that it is the most effective in
the improvement of% property. Further, when R-o, ass (→) and the same calculation as in the
above l are carried out, T-I 11 %% ml, de 4 J, rg- /, '143.
It becomes 2.033 at T, and it is te! -Is the smallest. The present invention has the effect of
reducing the secondary side by adding a specific attenuation characteristic of 1.5 billion (co #) I
to the J hydrophones as described above, and, in fact, on the output side of the hydrophone
There is an effect that the object can be achieved by a very simple means of connecting variable
resistors. , LO5 · 20 □
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a directional characteristic diagram of an
embodiment of the present invention, Fig. 2 is a circuit diagram of the embodiment, and Fig. 2 is
a p-chill # diagram. 1 · · · Hyde Four Hong agent patent attorney 祐 外-1 person EndPage: 2 (˜ -6,
other than the address of the address 12-12 Shiho Kubo Akiramachi, Minato-ku, Tokyo 10 10th
floor 4th floor 5 ] · · · 4 names ('724B) Patent Attorney Masao Kobayashi ,, 1 1 EndPage: 3