JP2585308Y2 - Omnidirectional measurement receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic device used underwater, and more particularly to a receiver for measuring the direction of a sound source in all directions.

[0002]

2. Description of the Related Art Conventionally, this type of receiver comprises four cylindrical piezoelectric vibrators, two conductive rings, a shaft and two load masses, as shown in FIG. One set of the receiving plates 31a, 31b, 31c, 31d
Are arranged in a square shape, and four receiving elements 31a,
Both sides of the support plate 6 are covered with housings 30a, 30b having through holes into which the load masses of 31b, 31c, 31d can be fitted and inserted, and an electronic circuit 34 is incorporated inside the housings 30a, 30b. ing.

As shown in FIG. 7, an electronic circuit 34 comprises four transformers 41a, 41b, 41 having a neutral point on the primary side.
c, 41d and two adder circuits 42a, 42b, and 2
The primary side of each of the transformers 41a, 41b, 41c, and 41d is provided with a corresponding one of the receiving elements 31a, 31b, 31c, and 31d.
d are connected respectively to the two conductive rings, the secondary side of all the transformers is connected to one adder circuit 42a, and the neutral point of all the transformers 41a, 41b, 41c, 41d is connected to the other adder circuit 42b. The neutral points of the transformers 41a, 41c, 41b, 41d corresponding to the wave receiving elements 31a, 31c, 31b, 31d facing each other are connected to the subtraction circuits 43a, 43b, respectively.

[0004] This conventional receiver operates as follows. In FIGS. 6 and 7, XY incorporated in the receiver
When the sound pressure P ₀ is incident on the load masses of the planar wave receiving elements 31a, 31b, 31c, and 31d at an angle か ら from the Z axis, the sound pressure is applied to the sound pressures applied to the load masses on the front surface and the back surface. A phase difference occurs due to the length. The vibration caused by the sound wave is transmitted to the vibrator via the load mass on both sides, and the vibrator generates an electric signal in which the two conductive rings have a positive polarity and the load mass and the support plate 6 have a negative polarity. Here, the polarity of the piezoelectric vibrator viewed from between the two conductive rings is reversely connected, and the output signal is the vibration from the front surface of the wave receiving elements 31a, 31b, 31c, 31d and the vibration from the back surface. , Ie, a dipole directivity signal having the maximum sensitivity in the Z-axis direction in FIG.
b, 41d.

Further, the two conductive rings are short-circuited, and the polarity of the piezoelectric vibrator viewed from between this and the load mass and the ground to which the support plate 6 is connected becomes forward connection, and the output signal of the piezoelectric vibrator is received. The signal is a signal of the sum of the vibration from the front surface and the vibration from the rear surface of the elements 31a, 31b, 31c, 31d, that is, a non-directional signal under the condition that the path difference is sufficiently smaller than the wavelength. Therefore, the outputs of the wave receiving elements 31a and 31c arranged in the X-axis direction in FIG. 41
c, connected to the primary side of C, and the omnidirectional signal obtained from the neutral point of the primary side is input to the subtraction circuit 43a to obtain a dipole directional signal in the X-axis direction from the difference signal obtained. At the same time, a signal of dipole directivity in the Y-axis direction is obtained by the wave receiving elements 31b and 31d arranged in the Y-axis direction, as in the case of the X-axis.

[0006] Signals of dipole directivity in the Z-axis direction are transmitted to transformers 41a, 41c, 41b, 41d connected to the respective receiving elements 31a, 31b, 31c, 31d.
The output of all the transformers is added to the summation circuit 42a in order to increase the phase difference accuracy with the omnidirectional signal.
To obtain the sum. The non-directional signal is obtained by adding the outputs of the neutral points of all the transformers 41a, 41c, 41b, and 41d by an adder circuit 42b in order to increase the phase difference accuracy with the dipole directivity signal in each axial direction. .

[0007]

However, the conventional omnidirectional measurement receiver receives a signal in a plane,
Although the signal of the dipole directivity in the Z-axis direction can be easily obtained, the signal of the dipole directivity in the X-axis and Y-axis directions must be calculated and obtained by an electronic circuit, and the wave receiving principle becomes complicated. There is. In addition, the conventional receiving principle of the omnidirectional measurement receiver requires a large number of receiving elements and transformers, and has a drawback that its electronic circuit is complicated.

An object of the present invention is to reduce the number of wave receiving elements and transformers and simplify the electronic circuit by arranging the wave receiving elements in each of the three orthogonal directions, thereby enabling practical measurement in all directions. An object of the present invention is to provide an omnidirectional measurement receiver having a simple structure.

[0009]

According to the present invention, two cylindrical piezoelectric vibrators having electrodes on the end faces and a conductive ring located between these piezoelectric vibrators are concentric and have inverted polarities. Vibrator laminations, a support having a shaft provided at the center of each face of a regular hexahedron, and a screw hole fitted into a screw portion provided on each shaft. And six load masses concentrically fixing the shafts and the respective oscillator stacks by pressing against the end faces of the oscillators, and the oscillators in three orthogonal directions and six directions with the center of the support as the origin. A receiver having the stack and the load mass, three transformers having a neutral point on the primary side to which two conductive rings of two sets of transducer stacks in each direction are connected, and Adder circuit to which the characteristic point is connected, and a housing for accommodating these receivers and the adder circuit Omnidirectional measurement receivers can be obtained, characterized in that they are composed of.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the receiver according to the present invention. FIG. 2 shows a cross section of the receiver according to the present embodiment, and FIG. 3 shows a partial cross section of two sets of the oscillator stacks out of the six sets of the oscillator stacks of the present embodiment.

The vibrator stack of this embodiment is arranged so that two sets of vibrator stacks of the six sets of vibrator stacks are opposed to each other and form a pair. For example, as shown in FIG. 3, a vibrator stack 10a including two piezoelectric vibrators 1a and 1b and a conductive ring 2a, and a vibration including two piezoelectric vibrators 1c and 1d and a conductive ring 2b similarly. The child laminations 10b are laminated at symmetrical positions on the opposing surface of the support 60 made of a regular hexahedron (cube). In this state, the shafts 4a, 4b
And are fixed to both surfaces of the support 60 by the load masses 3a and 3b, respectively. Here, the shafts 4a and 4b are screwed to the centers of the respective surfaces of the support 60, respectively. Further, each of the load masses 3a, 3b has a screw hole that fits into a screw portion provided at the extending end of each of the shafts 4a, 4b, and presses against the end face of each of the oscillator stacks 10a, 10b. hand,
Each shaft 4a, 4b and each oscillator lamination 10a, 10
b is fixed concentrically.

As described above, the receiver according to the present embodiment has two sets of transducer stacks 10a and 10b, 10c and 10d, 1
0e and 10f are respectively arranged in three orthogonal directions and six directions with the center of the support 60 as the origin. In addition, each load mass 3a, 3b, 3c, 3d, 3
e and 3f, as shown in FIGS. 1 and 2, each end face has a respective outer side face 11a, 11b, 11c,
Fitted so as to be buried in through holes formed in each outer surface so as to form the same plane as 11d, 11e, and 11f. The outer surface of the housing 11 is fixed with a set screw 13, and its surface is waterproofed by a watertight covering 15.

Further, an electronic circuit 14 connected to each of the transducer stacks 10a, 10b, 10c, 10d, 10e, and 10f is built in the housing 11. The electronic circuit 14 of the present embodiment includes three transformers 21 as shown in FIG.
a, 21b, and 21c and one adder circuit 22, and each of the oscillator stacks 10a, 10b,
Each conductive ring 2a of 10c, 10d, 10e, 10f
2b, 2c, 2d, 2e and 2d are connected to the cable 1 on the output side.
2 (FIG. 1) are respectively connected.

FIG. 5 shows the principle of operation of the present embodiment. Each set of transducer layers (here, 10a and 10b) is connected to the primary side of a transformer 21a by leads 5a and 5b, and each load mass ( Here, 3a, 3b) are the lead wires 5c.
Is connected to the support body 60 which becomes the ground.

In FIG. 5, the sound waves P ₀ applied to the load masses 3a, 3b of the transducer stacks 10a, 10b incorporated in the receiver become longitudinal vibrations and become piezoelectric vibrators 1a, 1b, 1.
c, 1d and terminated at the support 60. The piezoelectric vibrators 1a, 1b, 1c, and 1d are stacked with their polarities alternately inverted. The output on the positive side is extracted by two conductive rings 2a and 2b, and the output on the negative side is Two load masses 3 connected via shafts 4a, 4b
a, 3b and the support 60.

Here, the connection of the piezoelectric vibrators 1a, 1b, 1c, 1d viewed from between the two conductive rings 2a, 2b is as follows.
The piezoelectric vibrators 1a and 1b and 1c and 1d are reversely connected, and the output is a difference signal of the sound pressure received by the load masses 3a and 3b, that is, a signal of the dipole directivity in the Z-axis direction, and becomes a transformer 21a. Connected to.

Further, the two conductive rings 2a, 2b are short-circuited, and the piezoelectric vibrators 1a, 1b, 1 viewed from between this and the ground to which the load masses 3a, 3b and the support 60 are connected.
The connections of c and 1d are made of all the piezoelectric vibrators 1a, 1b, 1c and 1d.
And the output is a sum signal of the sound pressures received by the load masses 3a and 3b, that is, a non-directional signal.
a is derived from the neutral point. This omnidirectional signal is
As shown in FIG. 4, the outputs of the neutral points of all the transformers are added by an adder circuit 22 in order to increase the accuracy of the phase difference with the signal of the dipole directivity in each axis direction.

Therefore, according to the present embodiment, two axial directions are required.
Since the wave receiving element composed of a pair of transducer laminations is arranged, an accurate signal is obtained, and the azimuth accuracy is improved.

[0020]

As described above, according to the present invention, the azimuth accuracy of the receiver can be improved, the number of piezoelectric vibrators can be reduced, and the electronic circuit can be simplified.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention.

FIG. 2 is a schematic sectional view of an embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view of two sets of transducer layers in the embodiment.

FIG. 4 is a circuit diagram showing a connection state of the electronic circuit in the embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view illustrating the principle of operation of two sets of transducer laminations in the embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view of a conventional receiver.

FIG. 7 is a circuit diagram showing a connection state of an electronic circuit in a conventional receiver.

[Explanation of symbols]

1a, 1b, 1c, 1d Piezoelectric vibrator 2a, 2b Conductive ring 3a, 3b, 3c, 3d, 3e, 3f Load mass 4a, 4b Shaft 5a, 5b Lead wire 10a, 10b, 10c, 10d, 10e, 10f
Oscillator stack 11 Housing 12 Cable 13 Set screw 14 Electronic circuit 15 Watertight coating 21a, 21b, 21c Transformer 22 Addition circuit

Continuation of the front page (72) Inventor Yoshinori Hama 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (56) References JP-A-4-185099 (JP, A) JP-A-61-230599 ( JP, A) JP-A-62-163776 (JP, A) JP-A-3-238380 (JP, A) JP-A-2-303299 (JP, A) JP-A-62-174677 (JP, A) JP 55-72879 (JP, A) Japanese Utility Model 26281 (JP, U) Japanese Utility Model 63-163098 (JP, U) Japanese Utility Model 6-51888 (JP, U) (58) Field surveyed (Int) .Cl. ⁶ , DB name) G01S 3/803 G01S 7/521

Claims (1)

(57) [Scope of request for utility model registration] 1. Six sets of vibrator laminates in which two cylindrical piezoelectric vibrators having electrodes on the end faces and a conductive ring located between these piezoelectric vibrators are laminated concentrically and with reversed polarity. And a support provided with a shaft at the center of each surface of the regular hexahedron, and a screw hole that fits into a threaded portion provided on each shaft. Each of the vibrator stacks is concentrically fixed with six load masses.
A receiver having the above-mentioned oscillator stack and the above-mentioned load mass in six directions, and three neutral-point neutral points on the primary side to which two conductive rings of two sets of oscillator stacks in each direction are connected. An omnidirectional measurement receiver comprising: a transformer; an adder circuit to which neutral points of all the transformers are connected; and a housing for housing the receiver and the adder circuit.