CN108507665B - A kind of noise-monitoring equipment - Google Patents
A kind of noise-monitoring equipment Download PDFInfo
- Publication number
- CN108507665B CN108507665B CN201810236051.2A CN201810236051A CN108507665B CN 108507665 B CN108507665 B CN 108507665B CN 201810236051 A CN201810236051 A CN 201810236051A CN 108507665 B CN108507665 B CN 108507665B
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- noise
- wall
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- monitoring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The present invention relates to noise monitoring technical fields, disclose a kind of noise-monitoring equipment.The technical effect that the present invention has, the use rotating circular disc of noise-monitoring equipment of the invention, and angle index is provided on fixed disc, the rotating circular disc of setting can be rotated by worker, realize the accurate control of rotational angle, so that sound level meter is measured the noise of monitoring position different directions, the comprehensive monitoring to monitoring spot noise is realized；And noise-monitoring equipment of the invention uses condenser microphone, parasitic capacitance is not generated between its backboard and shell, and only exist the main capacitance between oscillating plate and backboard, more Q=C*V, Q is the quantity of electric charge, C is whole capacitors of microphone, V is voltage, since there is no parasitic capacitance, whole capacitors of microphone are just main capacitance, so that the noise and vibration of monitoring will not because of parasitic capacitance presence and be embodied in the loss of voltage so that the noise accuracy of microphone monitoring is higher, measurement result is more accurate.
Description
Technical field
The present invention relates to noise monitoring technical fields, in particular to a kind of noise-monitoring equipment.
Background technique
In Chemical Manufacture factory and enginerring works, there are many large-scale production machines, and large-scale production machine is in work
Noise can be generated in the process, and the size of noise decibel and the variation of noise frequency can cause the body and mind of the staff in factory
Injury, but existing noise-monitoring equipment, the detection sensitivity in factory is not high and cannot carry out to monitoring spot noise
Comprehensive monitoring, so that monitoring result is inaccurate, and cannot reduce noise in time, and staff's body and mind is finally caused to be hurt
Evil.
Summary of the invention
The first purpose of this invention is to provide a kind of noise-monitoring equipment, and noise can be monitored in factory, and
And accurately the decibel of noise and frequency can be detected, the accuracy of monitoring is improved, avoids causing noise to hurt worker
Evil.
The embodiment of the present invention is achieved in that the invention discloses a kind of noise-monitoring equipment, including pedestal, is set to
The bracket of the pedestal, the fixed disc for being installed on the support tube, is set to the fixation at the support tube fixed by the bracket
It the rotation axis of disk, the rotating circular disc for being sheathed on the rotation axis, the mounting rack for being sheathed on the rotation axis and is installed on described
The sound level meter of mounting rack；The fixed disc is provided with angle index and for covering the mounting rack and the rotating circular disc
Dust cover；The dust cover is provided with the fixing groove for fixing the rotation axis；One end of the rotation axis is through described solid
It fixed disk and extends in the support tube, the rotation axis is connect by bearing with the rotating circular disc；The rotation axis
The other end sequentially passes through the rotating circular disc and the mounting rack and extends to the fixing groove；The rotating circular disc setting is useful
In the indicator for reading the rotating circular disc rotational angle；The sound level meter includes that condenser microphone and the condenser type pass
The amplifier of sound device electrical connection, the AD sampling module being electrically connected with the amplifier, the number being electrically connected with the AD sampling module
Word signal processor and the single-chip microcontroller being electrically connected with the digital signal processor；The condenser microphone includes that insulation is outer
Shell, oscillating plate, backboard and mainboard；The insulation crust have the first inner wall and be oppositely arranged with first inner wall second in
Wall, the insulation crust are provided with the noise positioned at first inner wall into hole；The oscillating plate is placed in the insulation crust
Inner cavity and close to first inner wall, the oscillating plate is arranged in parallel with first inner wall and can be by noise vibration and along vertical
It is vibrated in the direction of the oscillating plate；The mainboard is placed in the inner cavity of the insulation crust and is bonded with second inner wall；Institute
It states backboard to be placed in the inner cavity of the insulation crust and be arranged in parallel with the oscillating plate, it is separate that the backboard is located at the oscillating plate
The side of first inner wall and it is fixed on the insulation crust, there is preset space length between the backboard and the oscillating plate；
The backboard and the oscillating plate are electrically connected with the mainboard, and the mainboard is electrically connected with the amplifier.
Further, the mounting rack is in regular triangular prism shape, and the rotation axis sequentially passes through the upper bottom of the mounting rack
Face；Three sides of the mounting rack are provided with mounting portion, and the mounting portion includes the square parallel with the mounting rack axis
Shape limit plate and rectangular base plate for fixing the sound level meter, the rectangle limit plate are two, the two of the rectangular base plate
End is connect with the adjacent surface of two rectangle limit plates respectively；The sound level meter, which is installed on, to be stated rectangular base plate and is located at two institutes
It states between rectangle limit plate.
Further, the mounting portion further includes the top plate for sound level meter rain cover, the rectangular base plate and the rectangle
The material of limit plate is porous material.
Further, the dust cover includes positioning annulus, the first circular metal mesh, the second circular metal mesh and embedding
Set on the metal fixing plate of the described second circular metal mesh inner ring；The fixed disc is provided with and the positioning annulus phase
The circular locating slot matched；One end of described first circular metal mesh is connect with the end face of the positioning annulus, and described first
The other end of circular metal mesh is connect with the end face of the described second circular metal mesh；The second circular metal mesh it is interior
Diameter is less than the internal diameter of the described first circular metal mesh.
Further, the rubber grips handle of the metal fixing plate setting arcuation.
Further, the fixing groove is in prism-shaped, and the fixing groove is set to the metal fixing plate, and the rotation axis is set
It is equipped with the prism positioning region to match with the fixing groove.
Further, the sound level meter further includes wireless transport module, the wireless transport module and the digital signal
The signal output of processor is electrically connected.
Further, the amplifier, the AD sampling module, the digital signal processor, the single-chip microcontroller and institute
It states wireless transport module to be respectively arranged in a rectangle mounting box, the sound level meter further includes for installing the rectangle installation
The protection shell of box and the insulation crust.
Further, the inner wall of the protection shell is provided with sliding slot, the outer wall of the rectangle mounting box and the insulation
The outer wall of shell is provided with the sliding part to match with the sliding slot.
The beneficial effect of the embodiment of the present invention is: noise-monitoring equipment of the invention is justified using rotary rotation
Disk, and angle index is provided on fixed disc, the rotating circular disc of setting can be rotated by worker, realize rotational angle
Accurate control so that sound level meter to monitoring position different directions noise be measured, realize to monitoring spot noise full side
Position monitoring；And noise-monitoring equipment of the invention uses condenser microphone, and parasitism is not generated between backboard and shell
Capacitor, and the main capacitance between oscillating plate and backboard is only existed, more Q=C*V, Q are the quantity of electric charge, and C is all electricity of microphone
Hold, V is voltage, and since there is no parasitic capacitance, whole capacitors of microphone are just main capacitance, so that the noise and vibration of monitoring is not
The loss of voltage can be embodied in because of the presence of parasitic capacitance, so that the noise accuracy of microphone monitoring is higher, measurement knot
Fruit is more accurate.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram of noise-monitoring equipment of the invention；
Fig. 2 is partial enlarged view at the A of noise-monitoring equipment of the invention；
Fig. 3 is the structural schematic diagram of dust cover of the invention；
Fig. 4 is the structural schematic diagram of sound level meter of the invention；
Fig. 5 is the structural schematic diagram of microphone of the invention；
Fig. 6 is the B-B direction sectional view of microphone of the invention；
Icon: 1- pedestal, 2- bracket, 3- support tube, 4- fixed disc, 40- angle index, 41- annular shape locating slot,
42- bearing, 430- positioning annulus, the circular metal mesh of 431- first, the circular metal mesh of 432- second, 433- metal are fixed
Plate, 4330- rubber grips handle, 5- rotating circular disc, 50- indicator, 6- mounting rack, 60- rectangle limit plate, 61- rectangular base plate,
62- top plate, 7- rotation axis, 70- prism positioning region, 8- sound level meter, 80- condenser microphone, 800- noise are slided into hole, 801-
Portion, 802- oscillating plate, 803- backboard, 804- mainboard, the first inner wall of 805-, the second inner wall of 806-, 81- amplifier, 82-AD sampling
Module, 83- digital signal processor, 84- wireless transport module, 85- single-chip microcontroller, 86- protect shell, 860- sliding slot.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, or be somebody's turn to do
Invention product using when the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.
Term " first ", " second ", " third " etc. are only used for distinguishing description, are not understood to indicate or imply relatively heavy
The property wanted.
Term " parallel ", " vertical " etc. are not offered as requiring component absolute parallel or vertical, but can be slightly tilted.Such as
" parallel " only refers to that its direction is more parallel with respect to for " vertical ", is not that the expression structure has to be substantially parallel, and
It is that can be slightly tilted.
The terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level, vertical or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In addition, the terms such as " substantially ", " basic " be intended to illustrate related content be not require it is absolute accurate, but can be with
There is certain deviation.Such as: " roughly equal " not merely indicates absolute equal, difficult due in actual production, operating process
To accomplish absolute " equal ", it is usually present certain deviation.Therefore, other than absolutely equal, " being substantially equal to " is also wrapped
It includes above-mentioned the case where there are certain deviations.As example, in the case of other, unless otherwise specified, " substantially ", " basic " etc.
Term is meaning similar to the above.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary.
For the ordinary skill in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment
As shown in figures 1 to 6, the present embodiment provides a kind of noise-monitoring equipments, including pedestal 1, set on the branch of the pedestal 1
Frame 2, by the fixed support tube 3 of the bracket 2, the fixed disc 4 for being installed on the support tube 3, set on the fixed disc 4
Rotation axis 7, the rotating circular disc 5 for being sheathed on the rotation axis 7, the mounting rack 6 for being sheathed on the rotation axis 7 and it is installed on the peace
6 sound level meter 8 is shelved, the bottom of support tube 3 is connect with pedestal 1；The fixed disc 4 is provided with angle index 40 and for covering
State the dust cover of mounting rack 6 Yu the rotating circular disc 5 in residence；The dust cover is provided with for fixing consolidating for the rotation axis 7
Determine slot；When needing to adjust the direction of the monitoring noise of sound level meter 8, anti-layer cover is removed, the rotating circular disc of rotation axis 7 is fixed in rotation
5, and accurate angle adjustment is carried out by the instruction of angle index 40, so that sound level meter 8 is to the comprehensive accurate of monitoring point
Monitoring；One end of the rotation axis 7 is through the fixed disc 4 and extends in the support tube 3, and the rotation axis 7 passes through
Bearing 42 is connect with the rotating circular disc 5；The other end of the rotation axis 7 sequentially passes through the rotating circular disc 5 and the installation
Frame 6 and extend to the fixing groove；The rotating circular disc 5 is provided with the instruction for reading 5 rotational angle of rotating circular disc
Needle 50；The sound level meter 8 includes condenser microphone 80, the amplifier 81 being electrically connected with the condenser microphone 80 and institute
The AD sampling module 82 for stating the electrical connection of amplifier 81, the digital signal processor 83 that is electrically connected with the AD sampling module 82 and with
The single-chip microcontroller 85 that the digital signal processor 83 is electrically connected；Microphone pick voice signal, and it is converted to voltage signal, amplify
Voltage signal in low impedance is converted into digital signal, digital signal for reducing voltage signal impedance, AD sampling module 82 by device 81
For processor 83 for handling digital signal, single-chip microcontroller 85 receives the signal from digital signal processor 83, and issues instruction；Institute
Stating condenser microphone 80 includes insulation crust, oscillating plate 802, backboard 803 and mainboard 804；The insulation crust has first
Inner wall 805 and the second inner wall 806 being oppositely arranged with first inner wall 805, the insulation crust are provided with positioned at described
The noise of one inner wall 805 is into hole 800；The oscillating plate 802 is placed in the inner cavity of the insulation crust and close to first inner wall
805, the oscillating plate 802 is arranged in parallel with first inner wall 805 and can be by noise vibration and along perpendicular to the oscillating plate
802 direction vibration；The mainboard 804 is placed in the inner cavity of the insulation crust and is bonded with second inner wall 806；The back
Plate 803 is placed in the inner cavity of the insulation crust and is arranged in parallel with the oscillating plate 802, and the backboard 803 is located at the vibration
Side of the plate 802 far from first inner wall 805 and it is fixed on the insulation crust, the backboard 803 and the oscillating plate 802
Between have preset space length；Oscillating plate 802 is vibrated by noise effect, and forms capacitor with backboard 803, for turning noise
Change voltage signal into, while backboard 803 only forms main capacitance without re-forming parasitic capacitance between oscillating plate 802, ensure that
The accuracy of microphone measurement；The backboard 803 and the oscillating plate 802 are electrically connected with the mainboard 804, the mainboard
804 are electrically connected with the amplifier 81.
The mounting rack 6 is in regular triangular prism shape, and the rotation axis 7 sequentially passes through the upper bottom surface of the mounting rack 6；It is described
Three sides of mounting rack 6 are provided with mounting portion, and the mounting portion includes the rectangle limit parallel with 6 axis of mounting rack
Plate 60 and rectangular base plate 61 for fixing the sound level meter 8, the rectangle limit plate 60 are two, the rectangular base plate 61
Both ends are connect with two 60 faces of rectangle limit plate respectively；The sound level meter 8, which is installed on, to be stated rectangular base plate 61 and is located at two
Between the rectangle limit plate 60.
The mounting portion further includes the top plate 62 for 8 rain cover of sound level meter, the rectangular base plate 61 and rectangle limit
The material of plate 60 is porous material.Porous material is porous metal material, plays the role of absorbing dust.
The dust cover includes positioning annulus 430, the first circular metal mesh 432 of circular metal mesh 431, second and embedding
Set on the metal fixing plate 433 of the described second 432 inner ring of circular metal mesh；The fixed disc 4 is provided with and the positioning
The circular locating slot 41 that annulus 430 matches；One end of described first circular metal mesh 431 and the positioning annulus 430
End face connection, the end face of the other end of the first circular metal mesh 431 and the second circular metal mesh 432 connects
It connects；The internal diameter of described second circular metal mesh 432 is less than the internal diameter of the described first circular metal mesh 431.
The rubber grips handle 4330 of arcuation is arranged in the metal fixing plate 433.
The fixing groove is in prism-shaped, and the fixing groove is set to the metal fixing plate 433, and the rotation axis 7 is provided with
The prism positioning region 70 to match with the fixing groove.
The sound level meter 8 further includes wireless transport module 84, the wireless transport module 84 and the Digital Signal Processing
The signal output of device 83 is electrically connected.Wireless transport module 84 can carry out data by wireless-transmission networks such as WIFI, 3G, 4G
Transmission.
The amplifier 81, the AD sampling module 82, the digital signal processor 83, the single-chip microcontroller 85 and described
Wireless transport module 84 is respectively arranged in a rectangle mounting box, and the sound level meter 8 further includes for installing the rectangle peace
The protection shell 86 of mounted box and the insulation crust.
The inner wall of the protection shell 86 is provided with sliding slot 860, the outer wall and the insulation crust of the rectangle mounting box
Outer wall be provided with the sliding part 801 to match with the sliding slot 860.
In conclusion the foregoing is only a preferred embodiment of the present invention by the present invention, it is not intended to restrict the invention,
For those skilled in the art, the invention may be variously modified and varied.It is all the spirit and principles in the present invention it
Interior, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of noise-monitoring equipment, which is characterized in that fixed including pedestal, set on the bracket of the pedestal, by the bracket
Support tube, be installed on the support tube fixed disc, set on the fixed disc rotation axis, be sheathed on the rotation axis
Rotating circular disc, be sheathed on the mounting rack of the rotation axis and be installed on the sound level meter of the mounting rack；The fixed disc is set
It is equipped with angle index and the dust cover for covering the mounting rack Yu the rotating circular disc；The dust cover is provided with for solid
The fixing groove of the fixed rotation axis；One end of the rotation axis is through the fixed disc and extends in the support tube, institute
Rotation axis is stated to connect by bearing with the rotating circular disc；The other end of the rotation axis sequentially passes through the rotating circular disc and institute
It states mounting rack and extends to the fixing groove；The rotating circular disc is provided with the finger for reading the rotating circular disc rotational angle
Show needle；The sound level meter includes condenser microphone, the amplifier being electrically connected with the condenser microphone and the amplifier
The AD sampling module of electrical connection, the digital signal processor being electrically connected with the AD sampling module and with the Digital Signal Processing
The single-chip microcontroller of device electrical connection；The condenser microphone includes insulation crust, oscillating plate, backboard and mainboard；The insulation crust
With the first inner wall and the second inner wall being oppositely arranged with first inner wall, the insulation crust is provided with positioned at described first
The noise of inner wall is into hole；The oscillating plate is placed in the inner cavity of the insulation crust and close to first inner wall, the oscillating plate
It is arranged in parallel with first inner wall and is vibrated by noise vibration along the direction perpendicular to the oscillating plate；The mainboard is placed in
It the inner cavity of the insulation crust and is bonded with second inner wall；The backboard be placed in the inner cavity of the insulation crust and with it is described
Oscillating plate is arranged in parallel, and the backboard is located at side of the oscillating plate far from first inner wall and is fixed on outside the insulation
Shell has preset space length between the backboard and the oscillating plate；The backboard and the oscillating plate are electrically connected with the mainboard
It connects, the mainboard is electrically connected with the amplifier.
2. noise-monitoring equipment as described in claim 1, which is characterized in that the mounting rack be in regular triangular prism shape, described turn
Moving axis sequentially passes through the upper bottom surface of the mounting rack；Three sides of the mounting rack are provided with mounting portion, the installation
Portion includes the rectangle limit plate parallel with the mounting rack axis and the rectangular base plate for fixing the sound level meter, the rectangle
Limit plate is two, and the both ends of the rectangular base plate are connect with two rectangle limit plates respectively；The sound level meter is installed on
The rectangular base plate and it is located between two rectangle limit plates.
3. noise-monitoring equipment as claimed in claim 2, which is characterized in that the mounting portion further includes for sound level meter rain cover
Top plate, the material of the rectangular base plate and the rectangle limit plate is porous material.
4. noise-monitoring equipment as described in claim 1, which is characterized in that the dust cover includes positioning annulus, the first circle
Annular metal net, the second circular metal mesh and the metal fixing plate for being embedded at the described second circular metal mesh inner ring；It is described
Fixed disc is provided with the circular locating slot to match with the positioning annulus；One end of the first circular metal mesh with
The end face connection of the positioning annulus, the end of the other end of the described first circular metal mesh and the second circular metal mesh
Face connection；The internal diameter of described second circular metal mesh is less than the internal diameter of the described first circular metal mesh.
5. noise-monitoring equipment as claimed in claim 4, which is characterized in that the rubber of the metal fixing plate setting arcuation is held
Hold handle.
6. noise-monitoring equipment as claimed in claim 4, which is characterized in that the fixing groove is in prism-shaped, the fixing groove
Set on the metal fixing plate, the rotation axis is provided with the prism positioning region to match with the fixing groove.
7. noise-monitoring equipment as described in claim 1, which is characterized in that the sound level meter further includes wireless transport module,
The wireless transport module is electrically connected with the signal output of the digital signal processor.
8. noise-monitoring equipment as claimed in claim 7, which is characterized in that the amplifier, the AD sampling module, described
Digital signal processor, the single-chip microcontroller and the wireless transport module are set in a rectangle mounting box, the sound level meter
It further include the protection shell for installing the rectangle mounting box and the insulation crust.
9. noise-monitoring equipment as claimed in claim 8, which is characterized in that the inner wall of the protection shell is provided with sliding slot,
The outer wall of the rectangle mounting box and the outer wall of the insulation crust are provided with the sliding part to match with the sliding slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810236051.2A CN108507665B (en) | 2018-03-21 | 2018-03-21 | A kind of noise-monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810236051.2A CN108507665B (en) | 2018-03-21 | 2018-03-21 | A kind of noise-monitoring equipment |
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| Publication Number | Publication Date |
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| CN108507665A CN108507665A (en) | 2018-09-07 |
| CN108507665B true CN108507665B (en) | 2019-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810236051.2A Active CN108507665B (en) | 2018-03-21 | 2018-03-21 | A kind of noise-monitoring equipment |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813415B (en) * | 2019-01-29 | 2019-12-20 | 兴润建设集团有限公司 | Assembly type building construction noise pollution detection device |
| CN110967666B (en) * | 2019-12-02 | 2023-03-14 | 安徽久工健业有限责任公司 | Neck movement noise checking device and method for massage chair |
| TWI817564B (en) * | 2022-06-17 | 2023-10-01 | 歐怡科技股份有限公司 | Sound measurement system and its correction auxiliary device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6027363B2 (en) * | 1978-03-01 | 1985-06-28 | 株式会社日立製作所 | Rotation angle detection device |
| CN206019835U (en) * | 2016-08-31 | 2017-03-15 | 江西方舟流体科技有限公司 | A kind of cooling tower noise detection device |
| CN206146524U (en) * | 2016-10-21 | 2017-05-03 | 华晨汽车集团控股有限公司 | Acoustic sensor support |
| CN206307555U (en) * | 2016-11-15 | 2017-07-07 | 李方敏 | It is a kind of to utilize the solar powered dustbin with environment monitoring function |
| CN206258181U (en) * | 2016-12-21 | 2017-06-16 | 北京强度环境研究所 | A kind of sound field space correlation system safety testing device |
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| CN108507665A (en) | 2018-09-07 |
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