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JP2011128086

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2011128086
The present invention provides a cross fan beam acoustic wave measurement sensor with
reduced side lobes. An acoustic wave measurement sensor includes transmitters 1, 1 and
receivers 2, 2, and is configured in a cross fan beam system in which these are arranged to be
orthogonal to each other. A crossing point between the transmitters 1 and 1 and the receivers 2
and 2 is configured as a transmitter-receiver complex 3B. In the transmission / reception
complex 3B, the transmission transducers 1s are arranged in the longitudinal direction of the
transmitters 1 and 1 so that the transmission transducers 1s are not missing, and each of the
reception transducers 2r is a receiver 2 , 2 are arranged in the longitudinal direction so as to be
missing. [Selected figure] Figure 1
Sound wave measurement sensor
[0001]
The present invention relates to a sound wave measurement sensor, and more particularly to a
sound wave measurement sensor suitable to be applied to a cross fan beam method in which a
transmitter and a receiver are disposed to be orthogonal to each other.
[0002]
Among the sound wave measurement sensors, a cross fan beam type in which a transmitter and a
receiver are disposed to be orthogonal to each other is manufactured for space saving and the
like.
[0003]
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1
For example, as shown in FIG. 7, this type of sound wave measurement sensor is composed of
transmitters 1, 1, receivers 2, 2, and a transmitter-receiver 3.
The transmitters 1 and 1 are configured by arranging a predetermined number of transmitter
transducers 1s in a linear array in two rows.
The wave receivers 2 and 2 are configured such that a predetermined number of wave receiving
transducers 2r are linearly arranged in two rows. The transmission / reception dual-use device 3
is located at the intersection between the transmitters 1 and 1 and the receiver 2. In this sound
wave measurement sensor, there is a problem that noise may wrap around from the transmitting
transducer 1s of the transmitting device 1 or 1 to the receiving device 2 or 2 side. For this
reason, there are also devices in which only the transmission dedicated device or the reception
dedicated device is disposed instead of the transmission / reception combined device 3.
[0004]
In this case, for example, as shown in FIG. 8, when the wave receiver 3A is provided instead of
the wave transmitter / receiver 3, the vibrator at the central portion of the wave transmitter 1, 1
is removed, In the directivity of the vertical plane of the transmitted beam, for example, as shown
in FIG. 9, there is a problem that side lobes occur. As shown in FIG. 10, for example, as shown in
FIG. 10, the directivity in the case where the transducer at the central portion of the transmitters
1 and 1 is absent is, for example, several dB larger in side lobe. Moreover, when suppressing the
side lobes, it is general to take measures to apply shading, but it is generally effective, but since
the vibrator at the central portion is missing, as shown in FIG. There is a problem that side lobes
occur regardless of the presence or absence of the light, and the effect of the same shading can
not be obtained sufficiently.
[0005]
In addition to the above-mentioned sound wave measurement sensor, there is, for example, an
underwater image sonar described in Patent Document 1 as a related art of this type. In this
underwater image sonar, the transmitter is configured in a cross fan beam system consisting of
one horizontal and one vertical row to which a frequency band is assigned. The transmission
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2
control unit scans the transmission beam direction of the transmission sound in a matrix, and
simultaneously and continuously controls the frequency of the transmission sound in
synchronization with the scanning. The wave receiver consists of two non-directional wave
receivers of different frequency bands. The multiplier multiplies the signal of each frequency
band. The band limiter outputs the high band signal of the output of the multiplier. FFT (Fast
Fourier Transform) separates frequency components from the output of a band limiter. The
target detection unit converts the color or gray level information according to the level of the
received signal, and generates an image based on the transmission beam direction corresponding
to each classified frequency component.
[0006]
Further, in the ultrasonic probe described in Patent Document 2, the first and second transducer
groups arranged in an array intersect each other on the surface of the packing material curved
with a predetermined curvature radius. A portion where both of them are arranged is used as a
third transducer group in which transducers are arranged in a matrix, and each transducer group
is selectively excited to transmit and receive ultrasonic waves. .
[0007]
Further, in the underwater image sonar described in Patent Document 3, the wave transmitting
device and the wave receiving device are provided, the wave transmitting device is provided with
a plurality of wave transmitters, and the wave receiving device is provided with a plurality of
wave receivers. It is equipped.
These transmitters and receivers are composed of cross arrays. In this cross array, a plurality of
transmission arrays in a column and a plurality of reception arrays in a row are orthogonal to
each other. Further, a location where the transmission array and the reception array cross each
other is a transmission / reception dual-use array.
[0008]
JP-A-2006-064524 JP-A-62-227327 JP-A-8-005728
[0009]
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However, the above related art has the following problems.
That is, in the underwater image sonar described in Patent Document 1, the amount of data
processing can be reduced by demapping the set of received frequencies in a matrix and setting
it as a receive beam direction. The configuration is different from that of the present invention,
for example, the device is composed of two nondirectional receivers, and does not solve the
above problems.
[0010]
In the ultrasonic probe described in Patent Document 2, the third transducer group has
transducers arranged in a matrix. With respect to this matrix form, the above problems can not
be improved because a clear description of the configuration and the effect can not be found.
[0011]
In the underwater image sonar described in Patent Document 3, the location where the
transmitting array and the receiving array cross each other is a transmitting / receiving array, so
the configuration is different from the present invention, and the above problems are improved.
It is not something to do.
[0012]
The present invention has been made in view of the above-described circumstances, and an
object thereof is to provide a cross fan-beam acoustic wave measurement sensor in which side
lobes are reduced.
[0013]
In order to solve the above problems, according to a first configuration of the present invention,
a transmitter configured by arranging a predetermined number of transmitting transducers in a
predetermined linear array and a predetermined number of receiving vibrations A cross fan
beam type sound wave measurement sensor having a receiver in which a plurality of transducers
are linearly arranged in a predetermined array, and the transmitter and the receiver are disposed
to be orthogonal to each other According to the present invention, at each of the intersections of
the transmitter and the receiver, the transducers for transmission are arranged so as to be
missing in the longitudinal direction of the transmitter, and It is characterized in that it is
configured as a transmission / reception complex device in which the transducers are arrayed so
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as to be missing in the longitudinal direction of the reception device.
[0014]
According to the configuration of the present invention, it is possible to reduce the side lobes of
the directional characteristics of the cross fan-beam acoustic wave measurement sensor.
[0015]
It is a schematic diagram which shows the structure of the principal part of the sound wave
measurement sensor which is 1st Embodiment of this invention.
FIG. 2 is a view showing the sound wave measurement sensor of FIG. 1 and directivity in the case
where there is no transducer at the intersection point.
It is a figure which shows the directivity at the time of giving a shading.
It is a figure which shows the directivity at the time of beam shift by the case where shading is
given.
It is a schematic diagram which shows the structure of the principal part of the sound wave
measurement sensor which is the 2nd Embodiment of this invention. It is a schematic diagram
which shows the structure of the principal part of the sound wave measurement sensor which is
3rd Embodiment of this invention. It is a block diagram of a sound wave measurement sensor. It
is a block diagram of another sound wave measurement sensor. It is a figure which shows the
directivity of the perpendicular surface of transmitting beam. It is a figure which shows the
directivity in the case where a vibrator | oscillator exists, and when missing. It is a figure which
shows the directivity at the time of giving a shading.
[0016]
The transmission / reception complex device realizes an acoustic measurement sensor in which
the transmission transducers and the reception transducers are alternately arranged in a matrix.
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[0017]
Further, the transmission / reception complex device is configured by arranging the transmission
transducers and the reception transducers in a checkered pattern.
Further, the transmission / reception complex device has the matrix corresponding to the
number of rows of the transmission transducers constituting the transmission device and the
number of rows of the reception transducers constituting the reception device. Is configured. In
addition, the transmission / reception complex device does not correspond to the number of
rows of the transmission transducers constituting the transmission device and the number of
rows of the reception transducers constituting the reception device. The above matrix is
configured.
[0018]
FIG. 1 is a schematic view showing the configuration of the main part of a sound wave
measurement sensor according to a first embodiment of the present invention. The sound wave
measurement sensor of this embodiment, as shown in the figure, has the same transmitters 1 and
1 and the receivers 2 and 2 as in FIG. 7, and they are arranged to be orthogonal to each other. It
is configured by the cross fan beam method. The transmitters 1 disposed in the horizontal
direction form a transmission beam in the vertical direction to transmit by transmitting a
predetermined drive signal to each transmission transducer 1s. Also, the receivers 2, 2 arranged
in the vertical direction form a receive beam in the lateral direction by giving a predetermined
drive signal to each transducer 2r for receiving wave, and the transmitter 1 , 1 receive a reflected
wave when the transmitted beam reaches the target and is reflected. Thereby, acoustic data is
obtained.
[0019]
In particular, in this embodiment, the intersection between the transmitters 1 and 1 and the
receivers 2 and 2 is configured as a transmitter / receiver complex 3B. The transmission /
reception complex devices 3B are arranged such that the transmission transducers 1s are not
missing (that is, the distance between the transducers does not increase) in the longitudinal
direction of the transmitters 1, 1; The receiving transducers 2r are arranged in the longitudinal
direction of the receivers 2, 2 so as to be defective (that is, the distance between the transducers
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does not open). Further, in this embodiment, the transmission / reception complex 3B is
configured by arranging the transmission transducers 1s and the reception transducers 2r
alternately in a matrix. In this case, in the transmission / reception complex 3B, the number of
rows of transmission transducers 1s constituting the transmissions 1 and 1 and the number of
rows of reception transducers 2r constituting the receptions 2 and 2 The above matrix is
configured correspondingly. The transmitters 1 and 1 are disposed in the lateral direction, and
the receivers 2 and 2 are disposed in the vertical direction. However, the transmitters 1 and 1
may be disposed in the opposite direction.
[0020]
2 shows the sound wave measurement sensor of FIG. 1 and the directivity when there is no
transducer at the intersection, FIG. 3 shows the directivity when shading is applied, and FIG. 4
shows the shading It is a figure which shows the directivity at the time of a beam shift by the
case where it carries out. The operation of this type of sound wave measurement sensor will be
described with reference to these figures. In this sound wave measurement sensor, a
predetermined drive signal is given to each transmission transducer 1s by the transmitters 1, 1
arranged in the lateral direction, whereby a transmission beam is formed in the vertical direction
and transmitted. Be waved. Further, a predetermined drive signal is given to each of the wave
receiving transducers 2r by the wave receivers 2, 2 arranged in the vertical direction, thereby
forming a receive beam in the horizontal direction. The reflected wave when the transmitted
beam of 1 reaches the target and is reflected is received. This reflected wave is analyzed by a
sonar or the like to obtain acoustic data.
[0021]
In this case, when the directivity of the vertical plane of the transmitted beam is theoretically
calculated as the frequency f, the distance d between the transducers, the size l of the
transducers, and the number n of transducers, the directivity shown in FIG. Is suppressed by
several dB. In addition, when directivity is calculated when the sound wave measurement sensor
is subjected to shading under certain conditions, side lobes are suppressed by about 5 to 6 dB as
shown in FIG. 3, and as shown in FIG. When shading is performed and the beam shift is also
performed, the side lobe is similarly suppressed by about 5 to 6 dB.
[0022]
As described above, in the first embodiment, since the intersection between the transmitters 1
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and 1 and the receivers 2 and 2 is configured as the transmitter / receiver complex 3B, the
transmitter 1 The side lobe of 1 is suppressed, and even when shading is applied, the side lobe is
suppressed by the transmission / reception complex device 3B.
[0023]
FIG. 5 is a schematic view showing the configuration of the main part of a sound wave
measurement sensor according to a second embodiment of the present invention.
In the sound wave measurement sensor of this embodiment, as shown in FIG. 5, instead of the
transmitters 1 and 1 and the receivers 2 and 2 in FIG. 1 showing the first embodiment,
transmitters of different configurations 1A, 1A and receivers 2A, 2A are provided. The
transmitters 1A, 1A are configured by linearly arranging a predetermined number of transmitter
transducers 1s in a line. The wave receivers 2A, 2A are configured by linearly arranging a
predetermined number of wave receiving transducers 2r in a line. Further, the intersection point
between the transmitters 1A and 1A and the receivers 2A and 2A is configured as a transmitter /
receiver complex 3B similar to that in FIG.
[0024]
In this sound wave measurement sensor, the number of rows of transmitting transducers 1s
constituting the transmitters 1A, 1A and the number of rows of receiving transducers 2r
constituting the receivers 2A, 2A are matrixed in a non-correspondence manner. Are configured
to perform substantially the same operation as the acoustic wave measurement sensor of FIG. 1
with similar advantages.
[0025]
FIG. 6 is a schematic view showing the configuration of the main part of a sound wave
measurement sensor according to a third embodiment of the present invention.
In the sound wave measurement sensor of this embodiment, as shown in FIG. 6, the wave
transmitters 1B and 1B and the wave receivers 2B and 2B are provided, and they are disposed to
be orthogonal to each other. The transmitters 1B and 1B are configured by arranging a
predetermined number of transmitter transducers 1s in a linear array in three rows. The wave
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receivers 2B and 2B are configured by arranging a predetermined number of wave receiving
transducers 2r in a linear array in three rows. In particular, in this embodiment, the intersection
between the transmitters 1B and 1B and the receivers 2B and 2B is configured as a transmitter /
receiver complex 3C.
[0026]
The transmission / reception complex 3C includes the number of rows (three rows) of
transmission transducers 1s constituting the transmissions 1B and 1B and the number of rows of
reception resonators 2r constituting the receptions 2B and 2B. A matrix is configured
corresponding to (3 columns). Like the transmission / reception complex 3B in FIG. 1, in this
transmission / reception complex 3C, each transmission oscillator 1s is not broken in the
longitudinal direction of the transmissions 1B and 1B Are arranged such that the distance
between them does not open), and each of the wave receiving transducers 2r is missing in the
longitudinal direction of the receivers 2B and 2B (that is, the distance between the transducers
does not open). It is arranged and arranged. In this acoustic wave measurement sensor,
substantially the same operation as that of the acoustic wave measurement sensor of FIG. 1 is
performed, and there are similar advantages.
[0027]
The embodiment of the present invention has been described in detail with reference to the
drawings, but the specific configuration is not limited to the embodiment, and even if there is a
design change or the like within the scope of the present invention, Included in the invention. For
example, in the third embodiment, the transmitting transducers 1s and the receiving transducers
2r of the transmitting / receiving complex 3C may be arranged in a checkered pattern
(corresponding to claim 3) . Further, the number of rows of transmitting transducers 1s
constituting the transmitters 1, 1A, 1B and the number of rows of receiving transducers 2r
constituting the receivers 2, 2A, 2B are the respective embodiments described above. It is not
limited to.
[0028]
The present invention can be applied to a sonar or acoustic measurement apparatus using a
cross fan beam system, in which the crossing point between the transmitter and the receiver is
not used as the transmission / reception wave.
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[0029]
1, 1A, 1B transmitter 2, 2A, 2B receiver 1s transmitter for transmission 2r receiver for reception
3B, 3C transmitter complex
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