JPH0143656Y2 - - Google Patents

Description

[Detailed description of the invention] This invention rotatably supports a sealed case containing multiple ultrasonic transducers with different operating frequencies.
This relates to a multi-frequency ultrasonic detector configured so that the ultrasonic transducer to be used comes to a predetermined position by rotating the sealed case by remote control from a ship or the like.
The embodiments shown in the drawings will be described below.

In FIG. 1, a sealed case 1 has a divided structure including a side tube portion 1a and upper and lower end portions 1b and 1c, which are made of an insulating material such as synthetic rubber or molded resin. A pair of support shafts 1 are provided on the outer surface of the side cylinder portion 1a.
a', 1a'' are provided in a protruding manner, and the upper and lower ends 1b, 1c are used as acoustic radiation plates, and two ultrasonic transducers 2a, 2b having different operating frequencies are fixed on the inner surfaces thereof. The sonic vibrators 2a and 2b are liquid-tightly sealed in an internal space formed by the side 1a of the sealed case and the acoustic radiation plates 1b and 1c, preferably together with a porous filler such as a sponge (not shown). These vibrators 2a and 2b are made of piezoelectric ceramic vibrators such as barium titanate, and have a frequency of, for example, 50KHz.
Designed to operate at a frequency of 200KHz. Further, the ultrasonic transducers 2a and 2b are provided with sufficient slack so as to be pulled out from the side 1a of the cylindrical case to the external transmitting/receiving circuit device O, and not to impede the rotation of the sealed case by the rotation drive means (described later). One end of a pair of lead wires 1 ₁ and 1 ₂ built into a long and thin cable L with _a
1. By making _the movable contact _{t3 of} the transmitting/receiving circuit device O selectively switchable with respect to the fixed contacts t1 and t2 provided at the other end of the transducer 2a or 2b.
can work. The holding fitting 3 is made of a single metal plate bent into a U-shape, and circular holes 3a' and 3b' are bored in both sides 3a and 3b, and the supporting shaft 1a of the sealed case 1 described above is inserted into the holding fitting 3. ', 1a'' are fitted to rotatably hold the case 1, and can be attached to the hull using the back piece 3b. A pulley 4 is fixed to the outer end of the support shaft 1a' of the sealed case, and a loop wire 5 is stretched across the pulley 4 to connect it to a manually or electrically operated remote lever (not shown) installed on the ship. When the remote lever rotates the pulley 4 in any direction via the loop wire 5, the sealed case 1 also rotates in the same direction.Contact _t1 by the above-mentioned movable contact _t3
The switching between and _t2 may be linked with a remote lever.

However, according to the configuration of the present invention, since the sealed case 1 immersed in the sea is held rotatably by remote control from the ship, it first operates at one frequency as shown in FIGS. 1A and B. The sealed case is rotated by remote control so that the acoustic radiation plate 1b with the ultrasonic transducer 2a fixed thereon faces the fishing school or seabed to be detected, and then an ultrasonic pulse is emitted or a reflected pulse is received. first
After the next detection, as shown in Fig. 2, the acoustic radiation plate 1c on which the ultrasonic transducer 2a operating at the other frequency is fixed is turned over to a predetermined position, and then the ultrasonic pulse is emitted in the same way as above. It becomes possible to perform secondary detection by transmitting and receiving.

The above embodiment is a case in which two ultrasonic transducers with different operating frequencies are provided, but if more transducers are provided, a polygonal cylindrical sealed case is used as shown in Fig. 3. 11, each side 11
A to 11d are acoustic radiation plates, and a plurality of ultrasonic transducers 1 each having a different operating frequency are provided on the inner surface thereof.
It is sufficient to fix the polygonal cylindrical case 11 in the direction of the arrow by remote control.

The proposed multi-frequency ultrasonic detector is constructed as described above, in particular, a plurality of ultrasonic transducers with different operating frequencies are arranged in a sealed case, and the case is remotely controlled from a ship or the like. Since the transducer is rotated by the oscillator so that the transducer to be used comes to a predetermined position, there are many types, such as the dual-frequency method, fishing type method, or various type method, which are used to improve detection ability. When applied to devices that use the frequency of

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which A is a partially sectional front view and B is a partially sectional plan view. FIG. 2 is a partial sectional view similar to FIG. 1B, showing a state in which the sealed case is rotated 180 degrees from the state shown in FIG. 1. FIG. 3 is a side sectional view of main parts according to another embodiment of the present invention. 1, 11...Sealed case, 1a', 1a''...Support shaft, 1b, 1c, 11a-11d...Acoustic radiation plate, 2a, 2b, 12a-12d...Ultrasonic vibrator, 3...Holding metal fitting , 4...Pulley, 5...Loop wire.

Claims (1)

[Scope of utility model registration request] A plurality of acoustic radiation plates each having fixed ultrasonic transducers with different operating frequencies form part of a sealed case, and the ultrasonic transducers are enclosed within the case, and the sealed case is rotatable. Multi-frequency ultrasound characterized by comprising: means for pivoting, and means for rotating the sealed case by remote control so that the acoustic radiation plate on which the ultrasound transducer to be used is fixed is in a predetermined position. Finder.