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JPS5784478

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DESCRIPTION JPS5784478
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a conventional sounding
method, FIG. 2 is a partially cutaway sectional view showing one embodiment of the present
invention, and FIG. 3 is an example of a gimbal used for this FIG. 4 is a view showing an example
of the air chamber. DESCRIPTION OF SYMBOLS 1 ... ship, 2 ... transmission / reception device, 5
... gimbal, 6 ... case, 7 ... bottom case, 8 ... oil, 9 ... air chamber.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transducer
having a non-pal mechanism for use in sounding operations. Conventionally, when measuring the
depth of a port or the like, the method as shown in FIG. 1 has been used. In the figure, 1 is a ship
which is conventionally used for sounding work, 2 is an ultrasonic transducer, and the outer
periphery of the vibrator 3 is made of urethane rubber etc. 20 (1),. 7 μ is water-tight molded
with a molding material 4 whose echo impedance is close to that of water. In the measurement of
depth, this transducer 2 is directed to the bottom of the water near the water surface, fixed to the
underside of the vessel 1 etc., and the transducer 2 transmits and receives ultrasonic signals, and
from transmission to delivery The water depth is measured 5 by time. When the transducer 2 is
fixed to the side of the ship 1 in this way, the transmission direction from the transducer 2
becomes oblique as shown in FIG. 1 (b) due to the rolling of the vessel 1, etc. In the rough sea, it
is impossible to obtain sounding work, and it has the disadvantage that there are ten. The present
invention eliminates these drawbacks by gimbaling the transducer and will be described in detail
below. FIG. 2 is a partially cutaway cross-sectional view 15 showing one embodiment of the
present invention, in which (=) shows a normal state and (b) shows a rolling state. In the figure, 2
is a non-pal of supporting the transducer molded transducer as described above, 5 is this
transducer), 6 is a bottom case 2 made of a material equivalent to the molding material of the
transducer 2 A sealed watertight case, 8 is an oil filled in the inside, 9 is an air chamber for
pressure control, and 10 is a very flexible signal line. FIG. 3 is a view showing the detailed
structure of the non-par 5; 11 is a ring rotatably supported by five supporting points 12 attached
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to the inner wall of the case 6; 13 is attached to the ring 11 A cylinder rotatably supported by a
fulcrum 14 is a mounting portion 15 of the transducer 2. FIG. 4 is a view showing a detailed
structure of the air chamber 9, which has a pressure receiving plate 18 airtightly treated with a
10 O-ring 17 at the bottom of the air outdoor casing 16, and the movable plate is moved by the
external pressure. The transducer 2 is supported so as to freely swing in both the X and Y
directions in the case 6 by the nonpar 5 having the structure as described above, regardless of
the direction of the case 6 by the action of gravity. It is supposed to turn directly below.
Therefore, as the signal line 10, a very flexible one such as a spiral cord is used so as not to
adversely affect the operation of the non-par 5.
In this case 6, as described above, oil 820 (3), one product is filled with ・ · V, which is the
above-mentioned jin · R) and the occurrence of rust due to exposure of the product 5 to seawater,
etc. To prevent its action from being blocked. Therefore, the density of the filled oil 8 is close to
the density of the water to be measured, sea water, etc., and the matching of the acoustic
impedance is performed so that there is no difference in the sound wave propagation speed.
Here, the oil 8 also functions as a damper of the transducer 2. In addition, the bottom case 7
blocking the bottom of the case 6 also uses the same material as that of the mold material 1 of
the transducer of the transducer 2 as described above, and the sound propagation speed also
changes in this portion To make it happen. Furthermore, the air chamber as described above is
provided in the upper part of the case 6 to absorb the thermal expansion of the oil 8 due to the
temperature change by the movement of the pressure receiving plate 18. As soon as the pressure
of thermal expansion of the oil 8 is applied to the pressure receiving plate 18, the pressure
receiving plate 18 absorbs the pressure in the inside of the outer casing 16 airtightly maintained
by the O-ring 17. This realizes an easy-to-handle transducer that can be placed outdoors,
underwater, anywhere 2 (4) 7. As described above, even when the case 6 is fixed to the underside
of the ship 1 by using the transducer having the non-bell mechanism according to the present
invention, as shown in FIG. Regardless of 5J'Fg, which the 6 is facing, / /, the transmitter /
receiver 2 is always directly below. Because it is facing, the transmission direction will not be
oblique. Therefore, the sounding accuracy is extremely high, and the sounding operation can be
performed even on rough sea. Here, the transmitter-receiver having the non-gullet mechanism 10
configured in this way has the natural frequency of the system itself sufficiently higher than the
oscillation period of the ship 1 and the center of gravity of the nonpal 5 and the transmitterreceiver 2 It is needless to say that it is necessary to take care not to resonate with the
fluctuation of the ship 1 by properly selecting the relationship. It is also possible to measure the
displacement of the oscillation by overlaying the accelerometer on the transducer and integrating
the data obtained twice.
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