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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field measurement apparatus for measuring a sound field formed in water of an ultrasonic
probe using a hydrophone for measurement. (Prior Art) Measuring a beam profile of an
ultrasonic beam emitted by an ultrasonic probe into a sound field, that is, a sound pressure
distribution in the vicinity of an acoustic line, etc. It is needed in order to be able to be a material
to grasp the situation of sound wave propagation. The conventional sound field measurement
device X the hydrophone for measurement in water. When measuring the sound pressure
distribution etc. while performing position adjustment and scanning on the y and z3 wheels,
positioning of the hydrophone has been performed depending on the accuracy of the three-axis
moving mechanism itself. Since the Z-axis can be determined by the arrival time of the ultrasonic
wave to be measured, it can be checked using these and it has been actually performed. However,
with regard to the X axis and the y axis, there was no way but to rely on the accuracy of the
moving mechanism to request the designated position. (Problems to be solved by the invention)
Therefore, in the water, it is necessary to have an xy movement mechanism capable of moving
the water while accurately maintaining the position on the plane of the hydrophone, and in the
end, it can be moved directly in the water Since there is no such thing, we had to adopt a method
of moving the hydrophone by placing a moving mechanism in the air and hanging a rod or the
like with the hydrophone attached to the tip of its arm. The ultrasonic probe may be moved
downward for measurement with the ultrasonic probe slightly invading the water surface
downward, but in any case, the support arm is extended and used as a cantilever. Unstable and
prone to chattering. In addition, it is necessary for the xy moving mechanism to have a resolution
of 0.0511 or less after adding up any errors such as backlash, and it is extremely difficult to
obtain the above resolution with such a structure. is there. The present invention has been made
in view of the above points, and its object is to make it possible to position the moving means and
the positioning means of the hydrophone with a simple structure, with a fairly accurate position,
and moving the water It is about realizing the hydrophone movement mechanism which can be
done. (Means for Solving the Problems) The present invention for solving the above problems is a
sound 1111 for measuring a sound field formed in water of an ultrasonic probe by using a
measuring hydrophone. Hydrophone moving means for electrically controlling the position of the
hydrophone by control, and at least three omnidirectional wide bands for transmitting ultrasonic
signals for identifying the position of the hydrophone moved by the hydrophone moving means
The apparatus is characterized by comprising transmitting means and ultrasonic receiving means
for receiving an ultrasonic signal from the broadband transmitting means.
(Operation) When ultrasonic waves are transmitted from the ultrasonic probe to form a sound
field in the water, electric energy is supplied to the hydrophone moving means by remote control
to move the sound field. Each of at least three broadband transmission means transmits an
ultrasonic signal and receives it by the delivery means to identify the position of the hydrophone.
Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic structural view of an embodiment of the present invention. In the figure, 1
is an ultrasonic probe for forming an underwater sound field, 2 is a hydrophone for measuring
the underwater sound field formed by the ultrasonic probe 1 in water, and is attached to the
pedestal 3 There is. 4a。 Reference numerals 4 b and 4 c denote three substantially
nondirectional broadband transmitters for positioning the hydrophone 2. The pedestal 3 is
mounted on the frame 5 so as to be movable in the front and rear and left and right directions,
and is a strap 7a attached to two actuators (plunges v) 6a v 5 b disposed at approximately 90
'positions. Connected via 7b. A spring 8 is tensioned between the pedestal 3 and the frame 5 and
tensions the pedestal 3 in the direction opposite to the direction of the composite vector of the
actuators 5a and 5b, and the actuators 6a and 6b and the spring 8 I am in balance. The actuators
5a and 5b are electromagnet type plungers, and current can be supplied to the electromagnets in
the plungers by remote control to control the position of the pedestal 3. Next, the operation of
the embodiment configured as described above will be described. An ultrasonic wave signal is
transmitted from the ultrasonic probe 1 to be inspected, in which the ultrasonic wave oscillator is
submerged. Electric current is supplied to the electromagnets of the actuators 5a and 5b by
remote control to serve as the actuators 6a and 6b, and the suspended members 7a and 7b are
pulled by the compression force of the spring 8 to correspond to the movement of the actuators
5a and 5b. And the hydrophone 2 receives a sound field by the ultrasonic wave transmitted from
the ultrasonic probe 1 to measure the sound field. Next, the position at each measurement point
of the hydrophone 2 is identified. An omnidirectional broadband transmitter 4a transmits an
ultrasonic wave, and the hydrophone 2 receives it. Similarly, the hydrophone 2 receives the
ultrasonic wave transmitted by the broadband transmitter 4b which is nondirectional. It also
receives the transmission ultrasonic wave of the broadband transmitter 4C. The positions of the
broadband transmitters 4a, 4b and 4c are determined, and since the same birds are transmitted
by the signals, the arrival times of the transmission signals from the three broadband
transmitters 4a to 4C are triggered. Since the distance from each broadband transmitter can be
determined by calculation in comparison with the signal, the position of the hydrophone 2 can be
calculated from the positions and distances of the three points.
The identification of the broadband transmitters 4a, 4b and 40 may be made by adding an
identification code to the transmission signal. In the above device, the trigger circuit of the
broadband transmitters 4a to 4C, the hydrophone preamplifier for processing the reception
signal of the hydrophone 2 and its subsequent circuit, the circuit for remote control, etc. are
naturally necessary, but they are omitted. . As described above, according to this embodiment, it
is possible to realize a stable, inexpensive, backlash-free, inexpensive positioning apparatus
without using an unstable transfer mechanism such as a cantilever. The present invention is not
limited to the above embodiment. FIG. 2 is a block diagram of another embodiment. (A) The
figure is a perspective view, and (B) is a plan view. In the figure, the same parts as in FIG. 1 are
assigned the same reference numerals. In the figure, 11 is a broadband transmitter 4a.
Hydrophone for position measurement for receiving ultrasonic signals from 4b and 4c and
identifying their position, mounted on pedestal 3 at the end of double-acting arm 12, and for
measurement on that The hydrophone 2 is mounted. The double-acting arm 12 is rotatable at the
end of the arm 16 and the rotating shaft 15 rotated by the remote geared motor 11 with a
remote 11111 attached to the lower surface of the frame 13, the arm 16 directly connected to
the rotating shaft 15, and The arm 17 is connected and the other end is connected to the
pedestal 3. A plunger 18 operated by remote control is connected between the rotating shaft 15
and the pedestal 3. In the moving mechanism of this embodiment, both the angle θ and the
angle θ2 shown in the figure can be freely changed, and θ1 is controlled by the geared motor
14 and θ2 is controlled by the plunger 18. Therefore, the hydrophones 2 and 11 can be moved
to any position in the movable range by the geared motor 14 and the plunger 18. The
transmission signals of the broadband transmitters 4a, 4b and 4c are received by the position
measuring hydrophone 11 and their positions are identified. An example of the structure of the
hydrophone 2 and the hydrophone 11 for position measurement is shown in FIG. In the figure,
20 is a rubber cylinder which insulates the hydrophone 2 from the hydrophone 11 for position
measurement, and 21 is a rubber for protection, an outlet 22 of the hydrophone 2 and an outlet
23 of the hydrophone 11 for position measurement. It covers the hydrophone 11 for position
measurement. (Effects of the Invention) As described above in detail, according to the present
invention, the movement of the hydrophone in water can be carried out with a simple structure
without backlash, and moreover, the positioning can be carried out accurately. The effect of is
Brief description of the drawings
FIG. 1 is a schematic structural view of an embodiment of the present invention, FIG. 2 is a
schematic structural view of another embodiment of the present invention, and FIG. 3 is a view of
the hydrophone of the embodiment of FIG. .
DESCRIPTION OF SYMBOLS 1 ··· Ultrasonic probe 2 ··· Hydrophone 3 ··· Base 4a, 4b, 4c − ·······
Wide band transmitter 5 ··· Frame 5a, 5b ··· Actuator 7a, 7b ····· Hanging cord 8 · · · Spring 11 · · ·
hydrophone for position measurement · · · double acting arm 13 · · · frame 14 · · motor with gear
15 · · · rotation shaft 16. 17 · · · · arm 18 ... Plunger patent applicant Yokogawa Medical Systems,
Inc. Figure 2 Figure 3
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