CN220234925U - Automatic calibration device for nondirectional sound source - Google Patents
Automatic calibration device for nondirectional sound source Download PDFInfo
- Publication number
- CN220234925U CN220234925U CN202321596830.6U CN202321596830U CN220234925U CN 220234925 U CN220234925 U CN 220234925U CN 202321596830 U CN202321596830 U CN 202321596830U CN 220234925 U CN220234925 U CN 220234925U
- Authority
- CN
- China
- Prior art keywords
- sound source
- nondirectional
- center
- laser
- fixing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000008030 elimination Effects 0.000 claims abstract description 3
- 238000003379 elimination reaction Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 abstract description 15
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses an automatic calibration device for an nondirectional sound source, which is arranged in a sound elimination room and comprises a microphone, a sound source fixing device and a laser positioning device. The sound source fixing device comprises a height adjusting component, the top of the sound source fixing device is detachably and fixedly connected with an nondirectional sound source, the bottom of the sound source fixing device is fixedly connected with an electric turntable, and a central shaft of the sound source fixing device, a rotary central shaft of the turntable and the nondirectional sound source are coaxial; the laser positioning device comprises a word line laser and a level laser. The calibration device adopts the sound source fixing device and the electric turntable to realize full automation of the test process, and ensures that the rotation center of the nondirectional sound source coincides with the sound source center in the test process; and moreover, the center alignment of the nondirectional sound source and the microphone is ensured by adopting a laser positioning mode, so that the nondirectional sound source calibration efficiency is improved, and the calibration precision of the directivity index is also improved.
Description
Technical Field
The utility model belongs to the field of nondirectional sound source testing, and particularly relates to an nondirectional sound source automatic calibration device.
Background
The nondirectional sound source is a sound source capable of emitting sound waves with the same amplitude in all directions, and is mainly used for measuring acoustic characteristics such as sound insulation quantity, hall tone quality, reverberation time, sound absorption coefficient and the like. The national nondirectional sound source calibration is based on JJF 1468-2014 [ nondirectional sound source calibration Specification ] [1], and the establishment of the Specification mainly refers to GB/T6882-2008, GB/T19889.5-2005 and ISO 3382-1:2009, etc., which mainly describe the usage scenario of an omnidirectional sound source and meet the performance index of the usage scenario, there is no standard for the operation specifications of production and test of an omnidirectional sound source in China or internationally, which makes the calibration of an omnidirectional sound source lack of technical specifications.
The core problem of nondirectional sound source calibration is to solve the problem of calibrating directivity indexes. Ibarra D et al, journal Design and construction of an omnidirectional sound source with inverse filtering approach for optimization (inverse filter optimization design and construction of nondirectional sound sources) propose: the sound source is arranged on the rotary table through the tripod to test the directivity of the sound source, but the simple fixing device does not consider the problem of center alignment, and the rotary table can only manually adjust the rotation angle, so that the simple fixing device is not suitable for metering work. Jiang Bo et al in journal "measurement of three-dimensional directivity of speaker" propose: when the directivity of the loudspeaker is measured, the integrated control of turntable rotation and data acquisition is completed through CLIO10 and EASERA software, but the center alignment problem is not considered in the measuring device, and meanwhile, the loudspeaker and the nondirectional sound source are greatly different in acoustic characteristics. At present, for calibration of nondirectional sound sources, a conventional calibration device relying on manual positioning is generally used, the testing process is complex and tedious, the workload is large, and the accuracy is difficult to guarantee.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides an automatic calibration device for an nondirectional sound source, which adopts a sound source fixing device and an electric turntable to realize full automation of a test process and ensures that the rotation center of the nondirectional sound source coincides with the sound source center in the test process; the laser positioning method ensures that the nondirectional sound source is aligned with the center of the microphone, so that the nondirectional sound source calibration efficiency is improved, and the calibration precision of the directivity index is also improved.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the automatic calibration device for the nondirectional sound source is arranged in a sound elimination room and comprises a microphone and a sound source fixing device, and is characterized in that the top of the sound source fixing device is detachably and fixedly connected with the nondirectional sound source, the bottom of the sound source fixing device is fixedly connected with an electric turntable, and the center shaft of the sound source fixing device, the rotating center shaft of the turntable and the center of the nondirectional sound source are coaxial; the sound source fixing device further comprises a height adjusting assembly.
Preferably, the automatic calibration device of the nondirectional sound source further comprises a laser positioning device, wherein the laser positioning device comprises a word line laser and a horizontal laser; the sound source fixing device supports the base and marks a positioning line passing through the rotation center of the sound source fixing device; the horizontal line laser is connected with a laser bracket pin fixed on the supporting base, and the central line of the pin shaft of the horizontal line laser is perpendicular to the positioning line; the positioning line is matched with a word line laser and is used for aligning and referencing the microphone and the center of the nondirectional sound source in a vertical plane; the level laser instrument excites level line laser in a plane where a microphone center shaft and a sound source center are located, and is used for aligning and referencing the microphone and the nondirectional sound source center in the horizontal plane.
Preferably, the sound source fixing device comprises a supporting base, the turntable is provided with a centering connection structure, and the centering connection structure comprises a turntable rotation center connection shaft and a plurality of connection holes which are arranged in a central symmetry mode relative to the turntable rotation center connection shaft; the support base is fixedly connected to the turntable through a fastener and the connecting hole, a central hole is formed in the bottom of the support base, and the central hole is spliced with the turntable rotating center connecting shaft.
In a further preferred embodiment, a boss is disposed on the upper portion of the support base, and the height adjusting assembly is fixedly connected to the center of the boss.
Preferably, the height adjusting assembly comprises an inner telescopic rod and an outer telescopic rod, wherein the inner telescopic rod is inserted into the outer telescopic rod and can slide up and down and be locked in the outer telescopic rod.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, the nondirectional sound source is fixed at the rotation center of the electric turntable capable of automatically rotating through the sound source fixing device, so that the full automation of the testing process is realized, the manpower is saved, and the efficiency is improved.
2. The utility model adopts a 'line' laser and a horizontal laser to respectively realize the centering of the sound source center and the microphone center in the vertical plane and the horizontal plane, and has simple operation and high centering precision.
Drawings
Fig. 1 is a schematic structural diagram of an automatic calibration system for an nondirectional sound source according to an embodiment of the present utility model;
FIG. 2 is a schematic view of a sound source fixing device according to an embodiment of the present utility model;
fig. 3 is a front view of an automatic calibration device (default turntable) for an omnidirectional sound source according to an embodiment of the present utility model;
fig. 4 is a plan view of an automatic calibration device (default turntable) for an omnidirectional sound source according to an embodiment of the present utility model;
fig. 5 is a left side view of an automatic calibration device (default turntable) for an omnidirectional sound source according to an embodiment of the present utility model.
In the figure: 1. the sound source comprises an nondirectional sound source, a sound source connecting rod, an inner telescopic rod, an outer telescopic rod, a supporting base, a rotary table, a positioning line, a word line laser, a laser bracket, a pin shaft and a laser bracket.
Detailed Description
In order that the manner in which the above-recited features, advantages, objects and advantages of the present utility model are attained and can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
It should be noted that, in the description of the present utility model, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally coupled, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. When two elements are "fixedly connected" or "pivotally connected," the two elements may be directly connected or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The fixed connection or the fixed connection mode can be screw connection or welding or riveting or plugging connection or connection through a third component. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model provides an automatic calibration device of an nondirectional sound source, which is used for realizing automatic and rapid calibration of the nondirectional sound source in a anechoic chamber.
According to the requirements of the calibration standard, the nondirectional sound source automatic calibration system is shown in fig. 1. The calibration procedure is as follows: in the anechoic room, the nondirectional sound source is fixed on the rotary table, the pink noise is used for exciting the sound source, a microphone is used for measuring the frequency band sound pressure level at a position 1.5m away from the sound source center of the sound source, each time a group of data is measured, the rotary table rotates for 5 degrees, 72 groups of sound pressure level data under different angles are acquired in a 360-degree range of the whole measuring plane, and the directivity index of each 30-degree arc area can be obtained by subtracting the energy average of 7 point sound pressure levels in the area from the energy average of the sound pressure level of all measuring points.
To achieve calibration of the directivity of the sound source, errors introduced by the measurement itself are to be avoided as much as possible, wherein the influence of errors introduced by the deviation of the center of the sound source is particularly great. The deviation of the sound source center is mainly caused by two factors, namely, the nondirectional sound source center is not fixed on the rotary shaft of the rotary table, namely, the nondirectional sound source rotary center is not coincident with the sound source center, so that the position of the sound source center is continuously changed in the test process; the second is that the microphone is not in the vertical plane with the rotation center of the nondirectional sound source, i.e. the microphone (straight rod, such as the danish B & K4190 microphone of WS2 type) is not aligned with the sound source center of the sound source, and the transmission distance (ideal value 1.5 m) is deviated, which causes an error in the sound pressure level value measured by the microphone.
In order to solve the first problem, the utility model provides an automatic calibration device for nondirectional sound sources, which is provided with a sound source fixing device, as shown in fig. 2, wherein the sound source fixing device is fixed on a turntable 6 and comprises a supporting base 5, an outer telescopic rod 4, an inner telescopic rod 3 and a sound source connecting rod 2. The turntable 6 is a commercial electric turntable, and can adjust parameters such as rotating speed, rotating frequency, rotating angle of each frequency and the like according to requirements, and is provided with a centering connection structure of an external connector, and the centering connection structure comprises a connecting shaft at a rotating center and a plurality of connecting holes which are symmetrically arranged at the center. The supporting base 5 is a large inertial part and is fixedly connected to the turntable 6 through a fastener and a connecting hole on the turntable 6; the bottom of the rotary table is provided with a central hole which is spliced with a central connecting shaft of the rotary table 6; the upper part of the device is provided with a boss fixedly connected with an outer telescopic rod 4, and the outer telescopic rod 4 is inserted into the center inner hole of the boss. The inner telescopic rod 3 is inserted into the outer telescopic rod 4 and can slide up and down in the outer telescopic rod 4, and the inner telescopic rod and the outer telescopic rod are used as a height adjusting component for adjusting the installation height of the nondirectional sound source; and a locking component is further arranged between the inner telescopic rod 3 and the outer telescopic rod 4, when the height is adjusted, the locking component is loosened, so that the inner telescopic rod 3 slides in the outer telescopic rod 4, and when the nondirectional sound source is adjusted to a preset height, the locking component is locked, and the sliding between the inner telescopic rod 3 and the outer telescopic rod 4 is limited, so that the adjustment height is fixed. The lower end of the sound source connecting rod 2 is detachably connected with the upper end of the inner telescopic rod 3, and the upper end of the sound source connecting rod is provided with a detachable connection structure with the nondirectional sound source 1. Therefore, the turntable 6 can automatically drive the nondirectional sound source 1 to coaxially rotate with the nondirectional sound source, and compared with a traditional mode of fixing the sound source by using a tripod, the automatic rotation of the sound source can be realized, and the rotation precision is improved.
Aiming at the second problem, the automatic calibration device for the nondirectional sound source introduces the laser positioning device to position the microphone, and has high positioning precision and convenient operation. As shown in fig. 3, 4 and 5, a positioning line 7 passing through the rotation center of the sound source fixing device is marked on the support base 5, and a word line laser 8 is installed; the laser 8 can project a straight line laser and is connected with a laser bracket 9 fixed on the supporting base 5 through pins, and a pin shaft 10 of the laser is perpendicular to the positioning line 7, so that the laser can only rotate in a vertical plane. When in use, the laser 8 is rotated downwards, and the laser 8 is moved left and right to make the laser projected in a word line and the positioning line 7 collinear; then the laser 8 is rotated upwards, the microphone is rotated left and right (the horizontal distance between the microphone and the center of the sound source is not changed by 1.5 m), and the posture of the microphone is adjusted to lead the center of the microphone to be collinear with the laser of the 'one word line' projected by the laser 8; thus, the microphone and the sound source are ensured to be in the same vertical plane.
For alignment of a horizontal plane, arranging a horizontal laser instrument in the silencing chamber to excite horizontal line laser in a plane where a central axis of the microphone and a sound source center are located, and adjusting the height of the horizontal line laser to enable the horizontal line laser to be projected to the center of a microphone head of the microphone; and adjusting the height of the nondirectional sound source to enable the line laser of the level laser to be projected to the center of the sound source. The laser height of the horizontal line can be adjusted to be projected to the center of the sound source, and then the microphone is horizontally moved up and down (the horizontal distance between the microphone and the center of the sound source is not changed by 1.5 m), so that the laser of the horizontal laser instrument is projected to the center of the microphone head. Or fixing the position of the horizontal laser instrument and the height of the horizontal line laser, and respectively adjusting the heights of the microphone and the sound source to enable the horizontal line laser to be projected to the centers of the microphone and the sound source. Thus, the microphone center and the sound source center are ensured to be in the same horizontal plane.
When the nondirectional sound source is calibrated, the nondirectional sound source is coaxially arranged with the rotating center of the rotary table through the sound source fixing device, then the electric rotary table is started after the microphone and the nondirectional sound source are centered according to the operation method, the electric rotary table is automatically rotated according to parameters specified in the calibration process, and the multichannel sound analyzer automatically collects and processes data according to the parameters specified in the calibration process, so that the calibration of the nondirectional sound source can be completed. The process realizes full automation of the testing process, saves manpower and improves efficiency. Moreover, the centering operation is simple and quick, the centering accuracy is high, and the calibration accuracy is ensured.
The above embodiments are preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications or variations which may be made by those skilled in the art without the inventive effort within the scope of the appended claims remain within the scope of this patent.
Claims (5)
1. An automatic calibration device for nondirectional sound source is arranged in a sound elimination room and comprises a microphone and a sound source fixing device, and is characterized in that,
the top of the sound source fixing device is detachably and fixedly connected with an nondirectional sound source, the bottom of the sound source fixing device is fixedly connected with an electric turntable (6), and the center shafts of the sound source fixing device, the turntable (6) and the nondirectional sound source are coaxial;
the sound source fixing device further comprises a height adjusting assembly.
2. An automatic calibration device for an omnidirectional sound source as recited in claim 1, further comprising laser positioning means, said laser positioning means comprising a wordline laser (8) and a level laser;
a positioning line (7) passing through the rotation center of the sound source fixing device is carved on the sound source fixing device supporting base (5); the horizontal line laser (8) is in pin connection with a laser bracket (9) fixed on the supporting base (5), and the central line of a pin shaft (10) is perpendicular to the positioning line (7); the positioning line (7) is matched with a word line laser (8) and is used for aligning and referencing the microphone and the center of the nondirectional sound source in a vertical plane;
the level laser instrument excites level line laser in a plane where a microphone center shaft and a sound source center are located, and is used for aligning and referencing the microphone and the nondirectional sound source center in the horizontal plane.
3. An automatic calibration device for nondirectional sound sources according to claim 1, characterized in that said sound source fixing means comprises a supporting base (5), said turntable (6) being provided with a centering connection structure comprising a turntable rotation center connection shaft and a plurality of connection holes arranged centrally symmetrically with respect to said turntable rotation center connection shaft; the support base (5) is fixedly connected to the rotary table (6) through a fastener and the connecting hole, a central hole is formed in the bottom of the support base, and the central hole is spliced with the rotary center connecting shaft of the rotary table.
4. An automatic calibration device for an nondirectional sound source according to claim 1, wherein the height adjusting assembly comprises an inner telescopic rod (3) and an outer telescopic rod (4), the inner telescopic rod (3) is inserted into the outer telescopic rod (4) and can slide up and down and be locked in the outer telescopic rod (4).
5. An automatic calibration device for an nondirectional sound source according to claim 3, wherein a boss is provided at an upper portion of the support base (5), and the height adjusting assembly is fixedly connected to a center of the boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321596830.6U CN220234925U (en) | 2023-06-21 | 2023-06-21 | Automatic calibration device for nondirectional sound source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321596830.6U CN220234925U (en) | 2023-06-21 | 2023-06-21 | Automatic calibration device for nondirectional sound source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220234925U true CN220234925U (en) | 2023-12-22 |
Family
ID=89180914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321596830.6U Active CN220234925U (en) | 2023-06-21 | 2023-06-21 | Automatic calibration device for nondirectional sound source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220234925U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117596536A (en) * | 2024-01-18 | 2024-02-23 | 杭州爱华仪器有限公司 | Device and method for switching incident angle during microphone frequency weighting test |
-
2023
- 2023-06-21 CN CN202321596830.6U patent/CN220234925U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117596536A (en) * | 2024-01-18 | 2024-02-23 | 杭州爱华仪器有限公司 | Device and method for switching incident angle during microphone frequency weighting test |
| CN117596536B (en) * | 2024-01-18 | 2024-04-09 | 杭州爱华仪器有限公司 | Device and method for switching incident angle during microphone frequency weighting test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN220234925U (en) | Automatic calibration device for nondirectional sound source | |
| CN108761301A (en) | A kind of SMD crystal mechanism for testing | |
| CN217860305U (en) | Auxiliary device for detecting precision of machine tool rotating shaft | |
| CN219573898U (en) | Sample frame based on retroreflection coefficient test of accurate location of incident angle | |
| CN116320953A (en) | Microphone calibration test board | |
| CN218646447U (en) | Acoustic array support | |
| CN110596628A (en) | Far-field antenna test system alignment method | |
| CN215832645U (en) | Coaxiality detection device | |
| CN112461182B (en) | Adjustable groove depth measuring device and measuring method | |
| CN211042125U (en) | Laser plane interferometer for preventing workpiece from sliding off detection table | |
| CN114859141A (en) | Spherical surface near-field test system and test method | |
| CN209992147U (en) | TO clamping assembly and automatic coupling TO focal length testing device | |
| CN209992152U (en) | Inspection jig for aligning to center of rotating shaft | |
| CN117596536B (en) | Device and method for switching incident angle during microphone frequency weighting test | |
| CN218514385U (en) | Cellular wireless terminal coupling test system | |
| CN217934183U (en) | Automatic calibration seat | |
| CN219915721U (en) | Test system and coupling box | |
| CN219914302U (en) | Flatness testing device for disc brake disc | |
| CN221173686U (en) | Torsion tester with adjustable | |
| CN217057015U (en) | Measuring equipment for construction | |
| CN216696851U (en) | Ultrathin electric light attenuator | |
| CN218765329U (en) | Directional testing device for hemispherical gyroscope sensitive gauge head | |
| CN217930548U (en) | Calibrating device of photometer | |
| CN209231510U (en) | A kind of fixed platform for Laser Distance Measuring Equipment production line | |
| CN217900757U (en) | Marshall test piece height measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |