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JP2006121311

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DESCRIPTION JP2006121311
An object of the present invention is to perform acoustic diagnosis under noise such as
environmental noise and mechanical noise, so that the directivity of sound reception is variable
and target sound can be accurately measured without being affected by ambient noise. To
provide a sound collector easy to carry at the time of patrol. A telescopic cylindrical hood is
installed on a reflective plate having a concavely curved reflective surface. This cylindrical hood
has a role of insulating the sound entering from the direction other than the direction of the
device to which this sound collector is directed. Further, by adjusting the length of the cylindrical
hood, it is possible to adjust the above sound insulation effect and change and adjust the sound
collection range. Furthermore, the convenience at the time of carrying is improved by shrinking
this cylindrical hood. [Selected figure] Figure 1
Sound collector
[0001]
As one of the diagnostic methods for mechanical equipment, there is widely known an acoustic
method in which sound generated from mechanical equipment or the like is collected by a
microphone and diagnosis is performed. When diagnosis is performed by this method in a power
substation or the like, it is difficult to obtain a high S / N ratio because there is noise such as
environmental noise around the factory or operation noise of an adjacent mechanical device.
[0002]
In particular, although the microphone has directivity to some extent, it also captures arrival
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sounds from directions other than the direction in which the microphone is directed, so a
mechanism is needed to selectively collect the generated sound that arrives from a target fixed
direction. is there.
[0003]
Therefore, in order to intensively collect sound from a desired direction, a parabolic parabolic
reflector is conventionally provided, and a microphone is disposed in the vicinity of the focal
point or the focal point. Sound instruments are widely known.
However, although it is possible to intensively capture the sound coming from the direction of
the rotation axis, this parabolic sound collector also collects arrival sounds from directions other
than the desired direction, and the S / N of the measurement sound The ratio is reduced.
[0004]
In order to solve this problem, Patent Document 1 discloses a special deep-cut parabolic sound
collector provided with a sound pickup hood with a rotational paraboloid shape having a distance
of 10 or more times the focal distance between the apex and the focal point. It is disclosed. By
providing a sound collecting hood, this special deep carved parabolic sound collector blocks the
arrival sound from directions other than the device under test with the sound collecting hood,
reduces the effects of various noises, and improves the S / N ratio. It is possible. Japanese Patent
Application Laid-Open 7-231495
[0005]
However, since the sound collecting hood is large in the special deep carved parabolic type sound
collector of Patent Document 1, there is a problem that it is difficult to carry when performing
patrol of a power generation substation etc. for acoustic diagnosis. Further, in acoustic diagnosis,
the range of the sound to be collected is different for each test device, so it is desirable that the
sound collection range is variable. However, the above-mentioned parabolic type sound collector
and special deep carved parabolic type collection There is also a problem that the sound
collection range can not be changed because the shape of the sound collection hood or the
reflector is invariable.
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2
[0006]
SUMMARY OF THE INVENTION In view of the above-described conventional problems, the
present invention is variable in sound reception directivity and can accurately measure a target
sound without being affected by ambient environmental noise, and is easy to carry at the time of
patrol It aims at providing a sound collector.
[0007]
In order to achieve the above object, the invention according to claim 1 has a reflecting plate
having a concavely curved reflecting surface, and an axially expandable cylindrical sound
insulation extending from the peripheral edge of the reflecting plate to the reflecting surface
side. And a hood.
[0008]
Due to this feature, the central axis of the cylindrical sound insulation hood is directed toward
the device under test even under noise such as environmental noise and equipment noise, so that
noises from the other directions are blocked by the sound insulation hood. It is possible to
measure at a high S / N ratio.
[0009]
Further, in the sound collector according to claim 2, the reflection plate has a paraboloid shape
so that the sound reflected by the reflection plate is efficiently collected at one point.
[0010]
Moreover, the sound collector which concerns on Claim 3 has a support which supports a
microphone in the focus position of the said reflective surface, or its vicinity.
[0011]
A sound collector according to a fourth aspect of the present invention is the sound collector
according to any of the first to third aspects, wherein the sound insulation hood is configured by
connecting a plurality of cylindrical members having different diameters.
[0012]
When a wide sound collection range is expected because the width of the sound source is wide,
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etc., the sound insulation effect of the sound entering from other than the direction of the central
axis is adjusted by changing the length of the cylindrical hood It is possible to change the sound
collection range.
[0013]
Furthermore, when patrolling a power station or the like, by retracting the cylindrical hood, the
entire sensor including the sound insulation hood becomes compact and easy to carry.
[0014]
According to the present invention, due to the above-mentioned structure, it is possible to block
the sound entering from other than the direction of the central axis by the cylindrical hood and
to reduce the influence of ambient environmental noise.
Further, by adjusting the length of the cylindrical sound collecting hood, the sound collecting
range can be changed according to the object to be measured.
[0015]
Furthermore, by installing a reflection plate having a concavely curved reflection surface and
concentrating the sound incident on the reflection plate on the microphone, it is possible to
measure the target sound with high accuracy.
In addition, the above-mentioned cylindrical hood can be expanded and contracted, and the
convenience of carrying can be improved by shrinking the cylindrical hood.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
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FIG. 1 is an axial sectional view of a sound collector according to an embodiment of the present
invention.
[0017]
As shown in FIG. 1, the sound collector of this embodiment is constituted of a reflecting plate 2
having a concavely curved reflecting surface 2a, and a cylindrical hood 1 connected to the outer
peripheral edge thereof.
The reflecting surface 2a preferably has a paraboloid shape, reflects the incident sound, and
collects the sound in the vicinity of the microphone 7 installed at the focal position.
The cylindrical hood 1 and the reflecting plate 2 are formed of a lightweight, high-strength
material such as resin.
[0018]
The cylindrical hood 1 is composed of a plurality of cylindrical bodies of different diameters of
the first stage cylindrical body 3, the second stage cylindrical body 4, and the third stage
cylindrical body 5.
The outer diameter of the first cylindrical body 3 is smaller than the inner diameter of the second
cylindrical body 4, and the outer diameter of the second cylindrical body 4 is smaller than the
inner diameter of the third cylindrical body 5.
Therefore, the second cylindrical body enters the inside of the third cylindrical body 5, and the
first cylindrical body enters the inside of the second cylindrical body, so that the entire length of
the cylindrical hood 1 can be reduced.
[0019]
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Further, projections 3a, 4a, 4b and 5a are provided on the cylindrical bodies 3 to 5, respectively.
When the cylindrical hood 1 is stretched as shown in FIG. 1, the engagement between 3a and 4a
and 4b and 5a prevents the cylinders from being separated from each other.
[0020]
A support 6 for supporting a microphone is provided inside the first stage cylinder 3. The
support is for fixing the microphone at or near a point where the sound reflected by the concave
reflector 2 is concentrated (ie, the focal point of the reflective surface 2). Furthermore, the sound
collector is provided with a hand-held grip 8 for holding the sound collector by hand and
orienting the opening of the cylindrical hood 3 in a desired direction. In the second stage
cylindrical body 4 and the third stage cylindrical body 5, notches are provided in a portion
corresponding to the grip 8 so that the cylindrical bodies 4 and 5 and the grip 8 do not interfere
with each other when contracted. There is.
[0021]
Next, the operation will be described. As shown in FIG. 1, the incident sound 10 arriving from the
direction of the central axis 9 enters the inside from the opening of the cylindrical hood 1, but
the sound 11 arriving at an angle greater than or equal to the central axis 9 is a cylinder It is
shut off by the form hood 1.
[0022]
Therefore, by directing the central axis 9 to a desired sound source direction, the influence of
ambient noise can be reduced. Further, the sound 10 which has entered from the opening and
reached the concave reflector 2 is reflected by the reflection surface 2a and collected at the focal
point or in the vicinity thereof.
[0023]
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The cylindrical hood 1 can be expanded and contracted as described above. FIG. 1 shows an
extended state and FIG. 2 shows a contracted state. As shown in FIG. 2, when the cylindrical hood
1 is contracted, the range of the incident sound 10 reaching the reflecting surface 2a becomes
wider as compared with the state when it is stretched (FIG. 1), and as a result, the width of the
sound collecting range is widened. be able to.
[0024]
By adjusting the length of the cylindrical hood 1 in accordance with the width of the sound
source as described above, it is possible to collect sound in an optimal sound collection range.
[0025]
Furthermore, when carrying the inside of a facility such as a power substation or the like, as
shown in FIG.
[0026]
It is sectional drawing of the state which extended the cylindrical sound-collection hood of the
sound collector of this invention.
It is sectional drawing of the state which shrank the cylindrical sound-collection hood of the
sound collector of this invention.
Explanation of sign
[0027]
Reference Signs List 1 cylindrical hood 2 concave reflector 3 first stage cylindrical body 4 second
stage cylindrical body 5 third stage cylindrical body 6 support column 7 microphone 8 handgrip
9 central axis 10 incident sound
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