CN116320953A - Microphone calibration test board - Google Patents
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- CN116320953A CN116320953A CN202310255232.0A CN202310255232A CN116320953A CN 116320953 A CN116320953 A CN 116320953A CN 202310255232 A CN202310255232 A CN 202310255232A CN 116320953 A CN116320953 A CN 116320953A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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Abstract
The invention belongs to the technical field of acoustics, and particularly relates to a microphone calibration test board, which comprises a base, wherein a sound source supporting telescopic rod and a clamp table supporting telescopic rod which are telescopic in the vertical direction are arranged on the base; the upper end part of the clamp table supporting telescopic rod is provided with a microphone clamp table, and a microphone to be measured is fixed on the microphone clamp table; the microphone clamp table is provided with a laser positioning assembly and a calibration adjusting assembly; through the location cooperation of laser emission subassembly and laser positioning component, be the laser punctuation ware and the laser positioning hole that triangle-shaped was arranged in particular, can fix a position fast to can adjust the sideslip distance and the angle adjustment positioning accuracy of anchor clamps platform on the horizontal plane respectively through the calibration adjustment subassembly, make the geometric center of the front end face of sound generator and the geometric center coincidence of the microphone front end that is surveyed, reduce the measuring error in the location.
Description
Technical Field
The invention belongs to the technical field of acoustics, and particularly relates to a microphone calibration test board.
Background
The frequency response of a microphone is an important acoustic indicator. The same microphone is placed in a free sound field, a pressure sound field or a diffuse sound field, and the frequency response characteristics of the microphone are different: the frequency response of the different sound fields can be scaled to each other according to given correction values. There are three methods of microphone calibration, namely a free field comparison method, a coupling cavity comparison method and an electrostatic excitation method. The free field, i.e. the free sound field, is an experiment performed in an acoustic environment and a anechoic room simulating a uniform medium and having unlimited space.
The free field comparison method requires high test precision and small error, so that the geometric center of the sound-producing surface of the sound source and the geometric center of the front end of the tested microphone are required to be positioned on the same plane, and the error caused by calibration is reduced; therefore, the calibration test board of the microphone needs to fix the sound source and the measured microphone at the same time, and the geometric center of the sound emitting surface of the sound source and the geometric center of the front end of the measured microphone are positioned on the same plane by adjustment before calibration, so that the position error is reduced to the minimum. The existing test bench generally uses a precise scale tool to measure and position, but as the linear distance between a sound source and a tested microphone is generally at least one meter, measurement errors can be caused in comparison calibration test by measuring through the precise scale tool, and the accuracy of the test is affected.
Therefore, how to accurately fix the positions of the sound source and the measured microphone reduces the relative position error of the geometric center of the sound emitting surface of the sound source and the geometric center of the front end of the measured microphone, and becomes the problem to be solved by the microphone calibration test board in the prior art; in view of the above, the present invention provides a microphone calibration test stand.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a microphone calibration test board.
The purpose of the invention is realized in the following way:
the microphone calibration test board comprises a base, wherein a sound source supporting telescopic rod and a clamp table supporting telescopic rod which are telescopic in the vertical direction are arranged on the base, the sound source supporting telescopic rod is fixedly arranged on the base, a telescopic rod slideway in the horizontal direction is arranged between the sound source supporting telescopic rod and the clamp table supporting telescopic rod, and the clamp table supporting telescopic rod slides in the telescopic rod slideway; the telescopic rod slide rail coincides with a plane formed by the central axis of the sound source supporting telescopic rod and the central axis of the clamp table supporting telescopic rod. The upper part of the sound source supporting telescopic rod is fixedly provided with a sound source fixing box, and the sound source fixing box is provided with a sounder and a laser emission component; the upper end part of the clamp table supporting telescopic rod is provided with a microphone clamp table, and a microphone to be measured is fixed on the microphone clamp table; and the microphone clamp table is provided with a laser positioning assembly and a calibration adjusting assembly.
Further, the sound source supports the telescopic link and the clamp table supports the telescopic link and is electric telescopic link, and electric telescopic link can adjust the experiment height fast, practices thrift manual time, improves the adjustment precision. The sound source supports and is equipped with flexible regulating switch one on the telescopic link, and anchor clamps platform supports and is equipped with flexible regulating switch two on the telescopic link, and electric telescopic link is prior art, and it is not repeated here.
The laser emission assembly comprises three laser punctuation devices, a coordinate axis is established by taking the geometric center of the front end surface of the sounder as an origin, the X-axis direction is set to be parallel to the direction of the telescopic rod slideway, the first laser punctuation device and the second laser punctuation device are symmetrically arranged at two ends of the geometric center Y axis of the sounder, the third laser punctuation device is arranged at the lower end of the geometric center Z axis of the sounder, the laser punctuation device is preferably a laser punctuation device manufactured by Libao laser technology Co, the model is GL010, and when the test distance is 1 meter, the radius precision of a light spot can reach 0.1-0.25mm;
the laser positioning assembly comprises a front fixed sleeve, at least two fixed sleeve positioning shafts are arranged on the front fixed sleeve, at least two fixed sleeve positioning holes are formed in the test bench, and the fixed sleeve positioning shafts are in fixed sliding fit with the fixed sleeve positioning holes; the front fixed sleeve further comprises an annular sleeve, the annular sleeve is sleeved at the front end of the tested microphone, a positioning pore plate extends out of the outer wall of the annular sleeve along the diameter direction, and a laser positioning hole is formed in the positioning pore plate.
The number of the laser positioning holes is three, namely a first laser positioning hole, a second laser positioning hole and a third laser positioning hole, and the distance position relationship between the first laser positioning hole, the second laser positioning hole and the central axis of the annular sleeve is consistent with the distance position relationship between the first laser marker, the second laser marker and the geometric center of the front end face of the sounder.
Further, the calibration adjusting assembly comprises a clamp table sliding groove and a sliding connecting block, the clamp table sliding groove is fixedly arranged above the clamp table supporting telescopic rod, and the extending direction of the clamp table sliding groove is vertical to the extending direction of the telescopic rod sliding groove on a horizontal plane;
the lower end of the sliding connecting block slides in the fixture platform chute, a long hole is formed in the side wall of the fixture platform chute, the lower end of the sliding connecting block is fixedly provided with a first adjusting shaft, the first adjusting shaft penetrates through the long hole, the first extending end of the adjusting shaft is sleeved with a first fastening nut, and the first fastening nut is in threaded fit with the first extending end of the adjusting shaft;
the microphone clamp is characterized in that an adjusting shaft II is arranged on the upper portion of the sliding connecting block, a connecting lug plate is arranged at the bottom of the microphone clamp table, an adjusting connecting hole is formed in the connecting lug plate, the adjusting shaft II penetrates through the adjusting connecting hole, the adjusting shaft II is fixedly and rotatably matched with the adjusting connecting hole, a fastening nut II is sleeved on an extending end of the adjusting shaft II, and the fastening nut II is in threaded fit with an extending end of the adjusting shaft II.
When positioning is performed, the first laser marker, the second laser marker and the third laser marker are opened, and first light spots emitted by the third laser marker are overlapped with the third laser positioning hole; the specific adjustment method is as follows: the heights of the sound source supporting telescopic rod and the clamp table supporting telescopic rod are adjusted to enable the geometric center of the front end face of the sounder to be approximately consistent with the geometric center of the front end of the tested microphone, then the sliding connecting block is pushed to enable the clamp table to move, the geometric center of the front end face of the sounder is enabled to approximately coincide with the geometric center horizontal position of the front end of the tested microphone, fine adjustment is carried out until light spots emitted by the laser punctuation device III completely penetrate through the laser positioning hole III, and the fastening nut I is screwed; then, the microphone clamp table is rotated through handles arranged on two sides of the microphone clamp table, and the angle between the microphone clamp table and the horizontal plane is adjusted until the light spots emitted by the first laser marker and the second laser marker completely pass through the first laser positioning hole and the second laser positioning hole; according to the geometric relationship, the geometric center of the front end surface of the sounder is overlapped with the geometric center of the front end of the tested microphone, and the second fastening nut is screwed down to finish adjustment. The inner diameters of the first laser positioning hole, the second laser positioning hole and the third laser positioning hole are set according to the sizes of light spots emitted by the first laser marker, the second laser marker and the third laser marker.
Furthermore, the number of the laser marker and the laser positioning holes matched with the laser marker is at least three, and multiple groups can be positioned according to geometry in order to improve the precision.
Furthermore, the base is rectangular, and four corners of the base are respectively provided with adjusting feet; the base is provided with a horizontal bubble. The horizontal bubble is observed in the general way, the adjusting feet at four corners of the base are adjusted to enable the whole test bench to be kept horizontal, and adjusting time is shortened.
Further, the side of telescopic link slide is equipped with apart from the scale mark, and the length of scale mark is greater than 1 meter, through the setting of telescopic link slide and distance scale mark, can adjust the horizontal distance of anchor clamps platform and sound source box directly perceivedly, satisfies the microphone of different models and calibrates, has increased the practicality.
Furthermore, the shape of anchor clamps platform spout is T shape, and the lower part of sliding connection piece is T shape, and the cooperation in T shape groove can reduce mechanical rocking, further reduces the error.
The invention has the advantages that:
1. through the location cooperation of laser emission subassembly and laser positioning component, be the laser punctuation ware and the laser positioning hole that triangle-shaped was arranged in particular, can fix a position fast to can adjust the sideslip distance and the angle adjustment positioning accuracy of anchor clamps platform on the horizontal plane respectively through the calibration adjustment subassembly, make the geometric center of the front end face of sound generator and the geometric center coincidence of the microphone front end that is surveyed, reduce the measuring error in the location.
2. Through the setting of leading fixed cover, make the microphone front end unsettled, avoid causing the scattering of sound because of the front end interference, influence the calibration result, front end fixed cover and anchor clamps platform fixed sliding connection have guaranteed the fixed of microphone axial position simultaneously, reduce positioning error.
3. Through the setting of telescopic link slide, make the location coordinate Z axle of microphone and sound source on the coplanar, reduced accommodation, improved adjustment efficiency to can adjust the calibration test distance between microphone and the sound source on the horizontal plane, adapt to the test calibration of different model microphones.
4. Through observing the horizontal bubble that sets up on the testboard and adjusting the regulation lower margin that is located testboard base four corners, can make the testboard whole keep basic level before the calibration, reduce test error and accommodation.
Drawings
FIG. 1 is a schematic diagram of a microphone calibration test stand according to the present invention;
FIG. 2 is a schematic view of the sound source box structure of the present invention;
FIG. 3 is a schematic diagram of an adjusting calibration assembly according to the present invention;
FIG. 4 is a front view of an adjustment calibration assembly of the present invention;
FIG. 5 is a schematic view of the structure of the front fixing sleeve in the present invention;
FIG. 6 is a schematic view of a chute of a clamp table according to the present invention;
FIG. 7 is a schematic view of a sliding connection block according to the present invention;
FIG. 8 is a front view of a microphone clamp stand in accordance with the present invention;
FIG. 9 is a schematic view of the structure of the front fixing sleeve in the second embodiment of the present invention;
FIG. 10 is a schematic view of a fine adjustment structure of an angle in a fourth embodiment of the present invention;
FIG. 11 is a schematic view of a structure of an angle adjusting slider according to a fourth embodiment of the present invention;
in the figure: 1. a microphone assembly includes a base, 2 a sound generator, 3 a microphone holder stand, 301 a side mount, 302 a top mount, 303 a handle, 304 a fixed sleeve positioning hole, 305 a tuning connection hole, 306 a hinge rod, 4 a measured microphone, 5 a sound source fixing box, 6 a front fixing sleeve, 601 a circular sleeve, 602 a fixed sleeve positioning shaft, 603 a laser positioning hole, 604 a laser positioning hole, 605 a laser positioning hole three, 606 a positioning hole plate, 7 a sound source supporting telescopic rod, 701 a telescopic adjusting switch, 8 a clamp stand supporting telescopic rod, 801 a telescopic adjusting switch first, 9 a laser marker second, 11 a laser marker third, 13 a telescopic rod slide way, 14 a scale line, 15 a horizontal bubble, 16 a adjusting foot, 17 a clamp stand slide way, 1.T-shaped groove, 1702 a long hole, 18 a sliding connection block, 1801 a adjusting shaft first, 1802 a adjusting shaft second, 19 a fastening nut first, 20 a fastening nut second, 21 an angle adjusting slide block, 22 a rotary rod, 23 a precision threaded rod, 24, 25.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 1-6:
example 1
The microphone calibration test board comprises a base 1, wherein a sound source supporting telescopic rod 7 and a clamp platform supporting telescopic rod 8 which are telescopic in the vertical direction are arranged on the base 1, the sound source supporting telescopic rod 7 is fixedly arranged on the base 1, a telescopic rod slideway 13 in the horizontal direction is arranged between the sound source supporting telescopic rod 7 and the clamp platform supporting telescopic rod 8, and the clamp platform supporting telescopic rod 8 slides in the telescopic rod slideway 13; the telescopic rod slideway 13 is overlapped with a plane formed by the central axis of the sound source supporting telescopic rod 7 and the central axis of the clamp table supporting telescopic rod 8; the Z axes of the positioning coordinates of the tested microphone 4 and the sounder 2 are on the same plane through the arrangement of the telescopic rod slideway 13, so that the adjusting range is reduced, the adjusting efficiency is improved, the calibration and test distance between the tested microphone 4 and the sounder 2 on the horizontal plane can be adjusted, and the device is suitable for the test and calibration of microphones of different models; the base 1 is rectangular, and four corners of the base are respectively provided with adjusting feet 16; the base 1 is provided with a horizontal bubble 15. The horizontal bubble 15 is observed in the general way, and the adjusting feet 16 positioned at four corners of the base 1 are adjusted to enable the whole test bench to be kept horizontal, so that the adjusting time is shortened.
A sound source fixing box 5 is fixedly arranged on the upper part of the sound source supporting telescopic rod 7, and a sounder 2 and a laser emission component are arranged on the sound source fixing box 5; the upper end part of the clamp table supporting telescopic rod 8 is provided with a microphone clamp table 3, and a microphone 4 to be measured is fixed on the microphone clamp table 3; the microphone clamp table 3 is provided with a laser positioning assembly and a calibration adjusting assembly.
The sound source support telescopic rod 7 and the clamp table support telescopic rod 8 are electric telescopic rods, the electric telescopic rods can rapidly adjust the experimental height, the manual time is saved, and the adjustment precision is improved. The sound source supports and is equipped with flexible regulating switch one 701 on the telescopic link 7, is equipped with flexible regulating switch two 801 on the anchor clamps platform supports telescopic link 8, and electric telescopic link is prior art, and the description is not repeated here.
The laser emission component comprises three laser punctuation devices which are arranged on the same side end face of the front end of the sounder 6 on the sound source fixing box 5; setting up a coordinate axis by taking the geometric center of the front end surface of the sounder 2 as an origin, setting the X-axis direction to be parallel to the direction of the telescopic rod slideway 13, wherein the first laser marker 9 and the second laser marker 10 are symmetrically arranged at two ends of the geometric center Y axis of the sounder 2, the third laser marker 11 is arranged at the lower end of the geometric center Z axis of the sounder 2, the laser marker is preferably a laser marker manufactured by Libao laser technology Co., ltd, the model is GL010, and when the test distance is 1 meter, the radius precision of a light spot can reach 0.1-0.25mm;
the laser positioning assembly comprises a front fixed sleeve 6, two fixed sleeve positioning shafts 602 are arranged on the front fixed sleeve 6, two fixed sleeve positioning holes 304 are arranged on the test bench, and the fixed sleeve positioning shafts 602 and the fixed sleeve positioning holes 304 are fixedly matched in a sliding manner; the front fixed sleeve 6 also comprises an annular sleeve, and the annular sleeve is sleeved at the front end of the tested microphone 4; the front end of the measured microphone 4 is suspended through the fixed positioning of the annular sleeve to the front end of the measured microphone 4, the scattering of sound caused by the interference of objects at the front end is avoided, the calibration result is influenced, and meanwhile, the fixed axial position of the measured microphone 4 is ensured through the positioning sliding fit of the fixed sleeve positioning shaft 602 and the fixed sleeve positioning hole 304, and the positioning error caused by shaking is reduced;
the outer wall of the annular sleeve is provided with a positioning hole plate 606 extending in the diameter direction, and the positioning hole plate 606 is provided with a laser positioning hole. The number of the laser positioning holes is three, namely a first laser positioning hole 603, a second laser positioning hole 604 and a third laser positioning hole 605, and the distance position relationship between the first laser positioning hole 603, the second laser positioning hole 604 and the central axis of the annular sleeve 601 is consistent with the distance position relationship between the first laser marker 9, the second laser marker 10, the third laser marker 11 and the geometric center of the front end face of the sounder 2.
The calibration adjusting assembly comprises a clamp table chute 17 and a sliding connecting block 18, wherein the clamp table chute 17 is fixedly arranged above the clamp table supporting telescopic rod 8, and the extending direction of the clamp table chute 17 is vertical to the extending direction of the telescopic rod slideway 13 on a horizontal plane; the shape of the fixture platform chute 17 is T-shaped, the lower part of the sliding connection block 18 is T-shaped, and the matching of the T-shaped chute 1701 can reduce mechanical shake and further reduce errors.
The lower end of the sliding connection block 18 slides in the T-shaped groove 1701, a long hole 1702 is formed in the side wall of the clamp table chute 17, an adjusting shaft one 1801 is fixedly arranged at the lower end of the sliding connection block 18, the adjusting shaft one 1801 penetrates through the long hole 1702, a fastening nut one 19 is sleeved at the extending end of the adjusting shaft one 1801, and the fastening nut one 19 is in threaded fit with the extending end of the adjusting shaft one 1801; the upper portion of the sliding connection block 18 is provided with a second adjusting shaft, the bottom of the microphone clamp table 3 is provided with a connecting lug plate, the connecting lug plate is provided with an adjusting connecting hole 305, the second adjusting shaft 1802 penetrates through the adjusting connecting hole 305, the second adjusting shaft 1802 and the adjusting connecting hole 305 are fixedly and rotatably matched, the second adjusting shaft 1802 extends out of the end sleeve to be provided with a second fastening nut 20, and the second fastening nut 20 and the second adjusting shaft 1802 extend out of the end screw thread to be matched.
Before the calibration test, firstly, the tested microphone 4 is placed on the microphone clamp table 3, the front end of the tested microphone 4 passes through an annular sleeve 601 on a front fixed sleeve 6, the front fixed sleeve 6 is fixedly and slidingly connected with the microphone clamp table 3 through a fixed sleeve positioning shaft 602, and the power amplifier part at the tail end is compressed through a lateral pressing block 301 and a top pressing block 302; at this time, the first laser positioning hole 603 and the second laser positioning hole 604 on the front fixed sleeve 6 are symmetrically positioned at two sides of the geometric center of the front end of the microphone 4 to be measured, and the three points form a straight line; the laser positioning hole III 605 is positioned at the lower end of the geometric center of the front end of the microphone 4 to be measured, and two points form a straight line;
when positioning is performed, the first laser marker 9, the second laser marker 10 and the third laser marker 11 are opened, and first, a light spot emitted by the third laser marker 11 is overlapped with the third laser positioning hole 605; the specific adjustment method is as follows: the first telescopic adjusting switch 701 and the second telescopic adjusting switch 801 are respectively rotated, the heights of the sound source supporting telescopic rod 7 and the clamp table supporting telescopic rod 8 are adjusted, the geometric center of the front end face of the sounder 2 is approximately consistent with the geometric center of the front end of the tested microphone 4, the sliding connecting block 18 is pushed to enable the microphone clamp table 3 to move, the geometric center of the front end of the sounder 2 is approximately coincident with the geometric center of the front end of the tested microphone 4 in horizontal position, and the sliding connecting block 18 is finely adjusted until a light spot emitted by the laser marker III 11 completely passes through the laser positioning hole III 605, so that the fastening nut I19 is screwed; then, the microphone clamp table 3 is rotated through handles 303 arranged on two sides of the microphone clamp table 3, and the angle between the microphone clamp table 3 and the horizontal plane is adjusted until the light spots emitted by the first laser marker 9 and the second laser marker 10 completely pass through the first laser positioning hole 603 and the second laser positioning hole 604; according to the geometric relationship, the geometric center of the front end face of the sounder 2 coincides with the geometric center of the front end of the tested microphone 4, and the second fastening nut 20 is screwed down to finish adjustment. The inner diameters of the first laser positioning hole 603, the second laser positioning hole 604 and the third laser positioning hole 605 are set according to the sizes of light spots emitted by the first laser marker 9, the second laser marker 10 and the third laser marker 11, and are used for adjusting positioning accuracy.
The side of telescopic link slide 13 is equipped with apart from scale mark 14, and the length of scale mark 14 is greater than 1 meter, through the setting of telescopic link slide 13 and apart from scale mark 14, can adjust the horizontal distance of microphone anchor clamps platform and the fixed box 5 of sound source directly perceivedly, satisfies the microphone of different models and calibrates, has increased the practicality.
Example two
As shown in fig. 9, on the basis of the first embodiment, in order to make the front end of the microphone 4 to be measured sufficiently suspended, the positioning hole plate 606 on the front fixing sleeve 6 is moved back to above the rear end of the microphone 4 to be measured, and the first laser positioning hole 603, the second laser positioning hole 604 and the third laser positioning hole 605 are on the same straight line; the geometric centers of the laser positioning hole III 605 and the front end surface of the measured microphone 4 are on the same straight line in the vertical direction, and the laser positioning hole I603 and the laser positioning hole II 604 are symmetrically positioned on two sides of the laser positioning hole III 605; meanwhile, the installation distance of the first laser marker 9, the second laser marker 10 and the third laser marker 11 on the front end face of the sound source fixing box 5 is the sum, and the first laser positioning hole 603, the second laser positioning hole 604 and the third laser positioning hole 605 are guaranteed to be corresponding.
When positioning is performed, the first laser marker 9, the second laser marker 10 and the third laser marker 11 are opened, and first, a light spot emitted by the third laser marker 11 is overlapped with the third laser positioning hole 605; the specific adjustment method is as follows: the first telescopic adjusting switch 701 and the second telescopic adjusting switch 801 are respectively rotated, the heights of the sound source supporting telescopic rod 7 and the clamp table supporting telescopic rod 8 are adjusted, the geometric center of the front end face of the sounder 2 is approximately consistent with the geometric center of the front end of the tested microphone 4, the sliding connecting block 18 is pushed to enable the microphone clamp table 3 to move, the geometric center of the front end of the sounder 2 is approximately coincident with the geometric center of the front end of the tested microphone 4 in horizontal position, and the sliding connecting block 18 is finely adjusted until a light spot emitted by the laser marker III 11 completely passes through the laser positioning hole III 605, so that the fastening nut I19 is screwed; then, the microphone clamp table 3 is rotated through handles 303 arranged on two sides of the microphone clamp table 3, and the angle between the microphone clamp table 3 and the horizontal plane is adjusted until the light spots emitted by the first laser marker 9 and the second laser marker 10 completely pass through the first laser positioning hole 603 and the second laser positioning hole 604; according to the geometric relationship, the geometric center of the front end face of the sounder 2 coincides with the geometric center of the front end of the tested microphone 4, and the second fastening nut 20 is screwed down to finish adjustment. The inner diameters of the first laser positioning hole 603, the second laser positioning hole 604 and the third laser positioning hole 605 are set according to the sizes of light spots emitted by the first laser marker 9, the second laser marker 10 and the third laser marker 11, and are used for adjusting positioning accuracy.
By the arrangement, interference of the positioning hole plate 606 on test sound scattering is reduced, but machining accuracy of the front fixing sleeve 6 and the positioning hole plate 606 is required to be improved, and errors of experiments are guaranteed to be reduced to the minimum.
Example III
Based on the first embodiment and the second embodiment, the first laser positioning hole 603, the second laser positioning hole 604 and the third laser positioning hole 605 can be replaced by laser sensors arranged at corresponding positions, so that the positioning accuracy can be further improved.
Example IV
On the basis of the first embodiment, as shown in FIGS. 9-10
After the light spot emitted by the laser pointer three 11 and the laser positioning hole three 605 form positioning, the horizontal angle needs to be adjusted to enable the light spots of the laser pointer one 9 and the laser pointer two 104 to pass through the complete laser positioning hole one 603 and the laser positioning hole two 604 at the same time, the horizontal angle of the microphone clamp table 3 needs to be adjusted, the adjustment amplitude is small in most cases, the possible adjustment amplitude by using the handle 303 is overlarge, and an angle fine adjustment device is needed.
The angle fine adjustment device comprises an angle adjustment slide block 21, wherein the angle adjustment slide block 21 slides in the T-shaped groove 1701; a threaded rod positioning plate 25 is fixedly arranged on the fixture platform sliding chute, a precise threaded rod 23 is arranged on the threaded rod positioning plate 25 through a bearing, the precise threaded rod 23 is matched with the angle adjusting slide block 21 through a lead screw in a transmission manner, and a rotating wheel 25 is arranged on the precise threaded rod 23;
a hinge rod 306 is arranged below the microphone clamp table 3, the hinge rod 306 is connected with the angle adjusting slide block 21 through a connecting rod 24, and the connecting rod 24 and the hinge rod 306 are in hinge fit with the angle adjusting slide block 21.
When the angle needs to be adjusted, the second fastening nut 20 is firstly loosened, then the rotating wheel 25 is rotated, the angle adjusting slide block 21 slides in the T-shaped groove 1701 through the transmission fit of the precise threaded rod 23 and the lead screw of the angle adjusting slide block 21, and the connecting rod 24 drives the angle of the microphone clamp table 3 to be finely adjusted; when the light spots emitted by the first laser positioning hole 603 and the second laser positioning hole 604 simultaneously completely pass through the first laser positioning hole 603 and the second laser positioning hole 604, the second fastening nut 20 is screwed down to finish adjustment.
In the description of the present invention, it should be understood that the terms "upper", "lower", "X-axis", "Y-axis", "Z-axis", "left", "right", "top", "bottom", "inner", "outer", "side wall", "end face", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
While the exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that many changes and modifications can be made to the specific embodiments described above without departing from the spirit of the invention, and that many combinations of technical features and structures can be made without departing from the scope of the invention.
Claims (8)
1. The utility model provides a microphone calibration test platform, includes base, its characterized in that: the sound source support telescopic rod and the clamp table support telescopic rod which are telescopic in the vertical direction are arranged on the base, the sound source support telescopic rod is fixedly arranged on the base, a telescopic rod slideway in the horizontal direction is arranged between the sound source support telescopic rod and the clamp table support telescopic rod, and the clamp table support telescopic rod slides in the telescopic rod slideway; the telescopic rod slideway is overlapped with a plane formed by the central axis of the sound source supporting telescopic rod and the central axis of the clamp table supporting telescopic rod;
the upper part of the sound source supporting telescopic rod is fixedly provided with a sound source fixing box, and the sound source fixing box is provided with a sounder and a laser emission component;
the upper end part of the clamp table supporting telescopic rod is provided with a microphone clamp table, and a microphone to be measured is fixed on the microphone clamp table; and the microphone clamp table is provided with a laser positioning assembly and a calibration adjusting assembly.
2. A microphone calibration test stand as defined in claim 1, wherein: the laser emission assembly comprises three laser punctuation devices, a coordinate axis is established by taking the geometric center of the front end surface of the sounder as an origin, the X-axis direction is set to be parallel to the direction of the telescopic rod slideway, the first laser punctuation device and the second laser punctuation device are symmetrically arranged at two ends of the geometric center Y axis of the sounder, and the third laser punctuation device is arranged at the lower end of the geometric center Z axis of the sounder;
the laser positioning assembly comprises a front fixed sleeve, at least two fixed sleeve positioning shafts are arranged on the front fixed sleeve, at least two fixed sleeve positioning holes are formed in the test bench, and the fixed sleeve positioning shafts are in fixed sliding fit with the fixed sleeve positioning holes;
the front fixed sleeve comprises an annular sleeve, the annular sleeve is sleeved at the front end of the tested microphone, a positioning pore plate extends out of the outer wall of the annular sleeve along the diameter direction, and a laser positioning hole is formed in the positioning pore plate;
the number of the laser positioning holes is three, namely a first laser positioning hole, a second laser positioning hole and a third laser positioning hole, and the distance position relationship between the first laser positioning hole, the second laser positioning hole and the central axis of the annular sleeve is consistent with the distance position relationship between the first laser marker, the second laser marker and the geometric center of the front end face of the sounder.
3. A microphone calibration test stand as defined in claim 1, wherein: the calibration adjusting assembly comprises a clamp table sliding groove and a sliding connecting block, the clamp table sliding groove is fixedly arranged above the clamp table supporting telescopic rod, and the extending direction of the clamp table sliding groove is vertical to the extending direction of the telescopic rod sliding groove on a horizontal plane;
the lower end of the sliding connecting block slides in the fixture platform chute, a long hole is formed in the side wall of the fixture platform chute, the lower end of the sliding connecting block is fixedly provided with a first adjusting shaft, the first adjusting shaft penetrates through the long hole, the first extending end of the adjusting shaft is sleeved with a first fastening nut, and the first fastening nut is in threaded fit with the first extending end of the adjusting shaft;
the microphone clamp is characterized in that an adjusting shaft II is arranged on the upper portion of the sliding connecting block, a connecting lug plate is arranged at the bottom of the microphone clamp table, an adjusting connecting hole is formed in the connecting lug plate, the adjusting shaft II penetrates through the adjusting connecting hole, the adjusting shaft II is fixedly and rotatably matched with the adjusting connecting hole, a fastening nut II is sleeved on an extending end of the adjusting shaft II, and the fastening nut II is in threaded fit with an extending end of the adjusting shaft II.
4. A microphone calibration test stand as defined in claim 2, wherein: the number of the laser punctuation device and the laser positioning holes matched with the laser punctuation device is at least three.
5. A microphone calibration test stand according to claim 1, characterized by: the base is rectangular, and four corners of the base are respectively provided with adjusting feet; the base is provided with a horizontal bubble.
6. A microphone calibration test stand as defined in claim 1, wherein: the side of telescopic link slide is equipped with apart from the scale mark, and the length of scale mark is greater than 1 meter.
7. A microphone calibration test stand according to claim 3, wherein: the shape of the fixture platform chute is T-shaped, and the lower part of the sliding connecting block is T-shaped.
8. A microphone calibration test stand as defined in claim 1, wherein: the sound source support telescopic rod and the clamp table support telescopic rod are electric telescopic rods, a first telescopic regulating switch is arranged on the sound source support telescopic rod, and a second telescopic regulating switch is arranged on the clamp table support telescopic rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255232.0A CN116320953A (en) | 2023-03-16 | 2023-03-16 | Microphone calibration test board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255232.0A CN116320953A (en) | 2023-03-16 | 2023-03-16 | Microphone calibration test board |
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| Publication Number | Publication Date |
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| CN116320953A true CN116320953A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310255232.0A Pending CN116320953A (en) | 2023-03-16 | 2023-03-16 | Microphone calibration test board |
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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
- 2023-03-16 CN CN202310255232.0A patent/CN116320953A/en active Pending
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 |
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