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JPH0984171

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0984171
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
apparatus for S / N detection of sound generated from a target apparatus by reducing noise from
the surroundings, and is particularly suitable for acoustic equipment abnormality diagnosis
apparatus outdoors. The present invention relates to a weathering type directional noise
detection device.
[0002]
2. Description of the Related Art As a device for diagnosing and detecting an abnormality of
equipment, an acoustic diagnostic device for detecting an abnormality by detecting and analyzing
a sound generated by the equipment is used. A sensor used in an acoustic diagnostic apparatus is
required to have low sensitivity to noise from the surroundings and to detect sound coming from
the direction of the target apparatus with good S / N. As a sensor suitable for such purpose,
conventionally, a directivity fixed microphone such as a gun microphone type or a parabolic
antenna type has been widely used.
[0003]
The gun microphone type sensor is provided with an interference pipe in front of the
microphone, and the interference pipe appropriately directs the sound wave in a spatially wide
range to give directivity to the sensor. As in the case of the one described in Japanese Patent No.
37797, a simple structure in which a cylinder is attached to the end of the microphone, and the
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one having a complicated structure like the one described in Japanese Examined Patent
Publication No. 6-81325. Many types are known, including those attached to the tip of the.
[0004]
The parabola antenna type sensor provides directivity to the sensor by collecting a sound wave
of a spatially wide range using a reflector, and is described, for example, in Japanese Patent
Application Laid-Open No. 55-109100. Like the thing, the sound wave is collected to the
microphone part using reflectors of various shapes represented by parabola type.
[0005]
SUMMARY OF THE INVENTION These conventional directional fixed microphones are physically
capable of providing directivity by the interference or sound collection of a wide range of sound
waves as described above. There is a problem that the size of the
[0006]
Moreover, since these microphones are in contact with the atmosphere, these conventional
directional fixed microphones do not have sufficient water resistance when used for a long time
in the field, and also have a problem that the microphones are broken.
[0007]
The present invention has been made to solve such problems, and it is an object of the present
invention to provide a weatherproof directional sound detection device which is compact and has
a weather resistance.
[0008]
The above-mentioned problem is to store the acoustic sensor inside, and the cylindrical body
sealed on the opposite side to the sound sensing surface of the acoustic sensor, and the
cylindrical portion in front of the sound sensing surface of the acoustic sensor. The problem is
solved by a weathering-oriented directional sound detection device comprising an airimpermeable, vibratory membrane which is tensioned so as to isolate the acoustic sensor from
the atmosphere.
[0009]
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The thin film to be stretched transmits the sound wave from the vertical direction to the film
surface and makes it enter the inside of the cylinder, reflects the sound wave having the incident
angle more than a certain angle from the vertical direction on the film surface, and makes the
inside of the cylinder It has the property that it does not inject light.
Therefore, the sound wave sensed by the acoustic sensor has directivity in the direction
perpendicular to the thin film surface.
[0010]
Since the weathering type directional noise detection device has the above-described simple
configuration, it is possible to miniaturize the whole.
[0011]
In addition, since the acoustic sensor is shielded from the outside air by this thin film, even if the
weatherproof directional sound detection device is installed outdoors where rain falls, moisture
does not infiltrate the portion where the acoustic sensor is provided , Weather resistance is good
without damaging the acoustic sensor.
[0012]
If it is not inconvenient to enlarge the overall configuration of the device, the directivity can be
further improved while maintaining the weather resistance by installing the interference pipe at
the cylinder to the tip.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
FIG. 1 is a view showing the configuration of a weathering-type directional noise detection device
according to an embodiment of the present invention.
In FIG. 1, 1 is an acoustic sensor, 2 is a cylinder, 3 is a thin film, and 4 is a windproof screen.
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The acoustic sensor 1 is housed in a cylinder 2.
The side of the cylindrical body 2 opposite to the sound sensing unit of the acoustic sensor is
sealed.
The thin film 3 is stretched on the cylindrical portion (the front end of the cylindrical body 2 in
this embodiment) in front of the sound sensing surface of the acoustic sensor so as to shield the
acoustic sensor from the outside air.
The windproof screen is attached to the cylinder 2 so as to cover the front of the cylinder 2 and
the thin film 3.
The axial direction in FIG. 1 refers to the forward direction perpendicular to the thin film 3.
[0014]
As the acoustic sensor 1, a normal nondirectional microphone can be used.
The cylinder 2 may have any shape as long as it can accommodate the acoustic sensor 1.
Moreover, as a material of the cylindrical body 2, any material can be used as long as it has water
resistance and low sound permeability. However, in the case of outdoor installation, there is a
problem that raindrops hit the cylinder 2 and the cylinder 2 emits a sound, so in general, a heavy
material such as iron or lead or a thick material is suitable.
[0015]
The thin film 3 vibrates in response to the sound wave and can be used appropriately depending
on the environment where it is installed, as long as the thin film 3 does not pass through the air.
It is preferable to use a polyester-based film having excellent properties. Other thin film materials
that can be used include polyetheretherketone and thermoplastic polyimide. Polyether ether
ketone is particularly preferable because it is heat resistant, excellent not only in acid resistance
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and base resistance, but also in radiation resistance. Thermoplastic polyimide is preferable
because it is excellent in heat resistance.
[0016]
As the installation position of the thin film 3, as shown in FIG. 1, it is most easy to install it at the
tip of the cylinder 2 and it is easy to take out a square angle with respect to the cylinder 2 If it is
a front surface, you may provide in the inside of the cylinder 2. As shown in FIG.
[0017]
The windproof screen 4 is for reducing noise due to wind and is commercially available, so
detailed description will be omitted.
[0018]
The distance h between the thin film 3 and the acoustic sensor 1 needs to ensure a distance such
that the thin film 3 does not come in contact with the acoustic sensor 1 when the thin film 3 is
vibrated by sound waves. It is good to make it smaller.
If h exceeds 1 mm, the distance attenuation makes it difficult to catch the incoming sound wave
as h increases.
[0019]
FIG. 2 is a diagram showing the result of measuring the directivity of the weathering type
directional sound detection device shown in FIG.
In FIG. 2, the sensitivity of the sound wave coming from the direction (axial direction)
perpendicular to the thin film 3 is 0 dB, and the relative value of the sensitivity to the sound
wave coming from each direction is shown in the radar chart. According to FIG. 2, it can be seen
that good directivity is obtained especially for sound waves of 10 to 20 KHz.
[0020]
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It has been confirmed that the weathering-type directional noise detection device according to
the present embodiment has no problem in water resistance even when it is left in water for one
week. Furthermore, for detection of high frequency sound such as steam sound, when installed
for 1 year outdoors in a steelworks, it was confirmed that there is no problem in the weather
resistance and that no sound is emitted even when water droplets hit the cylinder.
[0021]
FIG. 3 is a view showing another example of the embodiment of the present invention. In FIG. 3,
the same parts as in FIG. In FIG. 3, the interference pipe 5 is provided at the tip of the cylindrical
body 2, and the windproof screen 4 is provided at the tip of the interference pipe 5. As the
interference pipe 5 used is a known one conventionally used for a gun microphone type fixed
directivity type microphone, and therefore detailed description will be omitted.
[0022]
FIG. 4 is a diagram showing the result of measuring the directivity of the weathering type
directional sound detection device shown in FIG. 3, and is in the same expression form as FIG.
According to FIG. 4, it can be seen that for the sound wave of 10 to 20 KHz, better directivity is
obtained than in the above embodiment.
[0023]
According to the present invention, since the sound wave from other than the axial direction is
attenuated by the thin film placed on the front of the acoustic sensor, the sound detection
apparatus having directivity can be realized by the small and simple structure. In addition, since
the acoustic sensor is shielded from the outside air by a thin film, it has good water resistance
and weather resistance, and can be installed outdoors for a long time. Moreover, directivity can
be further improved by installing an interference pipe at the end of the cylinder.
[0024]
Brief description of the drawings
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[0025]
FIG. 1 is a view showing a configuration of an example of a weathering type directional noise
detection device according to an embodiment of the present invention.
[0026]
FIG. 2 is a diagram showing the directivity of the weathering type directional noise detection
device shown in FIG. 1;
[0027]
FIG. 3 is a view showing the configuration of another example of the weathering-type directional
noise detection device according to the embodiment of the present invention.
[0028]
4 is a diagram showing the directivity of the weathering-type directional noise detection device
shown in FIG.
[0029]
Explanation of sign
[0030]
1 ... acoustic sensor, 2 ... cylinder, 3 ... thin film, 4 ... windproof screen
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