CN110166921B - Fixture for microphone calibration - Google Patents
Fixture for microphone calibration Download PDFInfo
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- CN110166921B CN110166921B CN201910336892.5A CN201910336892A CN110166921B CN 110166921 B CN110166921 B CN 110166921B CN 201910336892 A CN201910336892 A CN 201910336892A CN 110166921 B CN110166921 B CN 110166921B
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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Abstract
The invention discloses a clamp for calibrating a microphone, which comprises a bracket, a rotating mechanism and a locking and clamping mechanism for mounting the microphone; the bracket is used for supporting the rotating mechanism and the sound production component; the rotating mechanism is used for supporting the locking and clamping mechanism and driving the locking and clamping mechanism to rotate; and the locking and clamping mechanism is used for locking and clamping the microphone. The positions of the reference microphone, the microphone to be calibrated and the loudspeaker which participate in the experiment are relatively fixed, so that the calibration error caused by the position error of the calibration experiment microphone can be effectively reduced; and the locking clamping mechanism is driven to rotate 180 degrees according to a specific track by rotating the rotor, so that the positions of the microphones are exchanged, and the experimental efficiency is improved.
Description
Technical Field
The invention relates to a clamp for calibrating a microphone, and belongs to the field of microphone calibration. .
Background
The current commonly used sound intensity measurement method is a double-microphone cross power spectrum sound intensity measurement method, and the basic condition of sound intensity measurement is the phase difference of sound waves generated between two microphones. In an actual sound intensity measurement and analysis system, additional phase differences generated by other reasons exist between two measurement channels, and a sound intensity measurement error generated by the additional phase differences is called as a phase mismatch error, which is the most important error in the current sound intensity measurement method and is an important reason for restricting the development of the sound intensity measurement technology.
Calibration of the microphones corrects for phase and sensitivity mismatches due to inherent differences in the microphones.
The frequency response function method is one of effective methods for microphone calibration, and the principle is as follows: symmetrically placing a reference microphone and a microphone to be calibrated by taking a sound source as a center, and respectively acquiring sound pressure signals; in order to eliminate channel errors caused by position difference of the two microphones, the sound pressure signal acquisition is carried out again by adopting a method of exchanging the positions of the two microphones. And then, carrying out algorithm processing on the output sound pressure signal to obtain a correction function of the microphone to be calibrated:
wherein P is2(omega) is a frequency domain signal obtained by converting sound pressure signals collected by the microphone to be calibrated when the microphone is not exchanged, P1(omega) is a frequency domain signal obtained by converting sound pressure signals collected by a reference microphone when the microphones are not exchanged, P2(omega)' is a frequency domain signal obtained by converting sound pressure signals collected by the microphone to be calibrated after exchanging the microphone, P1And the (omega)' is a frequency domain signal obtained by converting the sound pressure signal collected by the reference microphone after the microphones are exchanged. In order to reduce the calibration error caused by the position error of the calibration experiment microphone and improve the experiment efficiency, a special microphone calibration fixture is necessary to be designed.
Disclosure of Invention
The invention provides a clamp for calibrating a microphone, which is used for calibrating the microphone by a frequency response function method and can realize the exchange of the position of the microphone by rotation.
The technical scheme of the invention is as follows: a clamp for calibrating a microphone comprises a bracket, a rotating mechanism and a locking and clamping mechanism for mounting the microphone;
the bracket is used for supporting the rotating mechanism and the sound production component;
the rotating mechanism is used for supporting the locking and clamping mechanism and driving the locking and clamping mechanism to rotate;
and the locking and clamping mechanism is used for locking and clamping the microphone.
The support comprises a long support column 1, a short support column 2, a support ring 3 and a base 4; wherein two long support columns 1 pass through the support ring 3 and are placed along the diameter symmetry, the bases 4 locked by nuts are installed at the lower ends of the long support columns 1 at the two ends, the upper ends of the two long support columns 1 are in threaded connection with the two ends of the middle cross beam 11 of the rotating mechanism, the upper ends of the two short support columns 2 are connected with threaded holes at the diameter symmetry positions of the support ring 3, and the bases 4 locked by nuts are installed at the lower ends of the two short support columns 2.
The rotating mechanism comprises a rotor 5, a top cover 6, a central shaft 7, a bearing 8, a compression spring 9, a top ball 10, a cross beam 11 and a bottom cover 12; the horizontal microphone mounting structure comprises a beam 11, a bottom cover 12, a top cover 6, two bearings 8, a bearing 8 outer ring, a bearing 8 inner wall, a central shaft 7, a bearing 8 inner ring, a rotor 5 rack-shaped structure, a rotor 5 outer wall, a top ball 10, a compression spring 9, a top ball 10, a circular hole, a circular groove 6-1 of the top cover 6 and a microphone mounting frame 13, wherein the bottom end of the cylinder 11-2 in the beam 11 is connected with the bottom cover 12 through screws, the top end of the cylinder 11-2 in the beam 11 is connected with the top cover 6 through screws, the two bearings 8 are installed in the cylinder 11-2, the outer ring of the bearing 8 is in interference fit with the inner ring of the central shaft 7, the upper.
The locking clamping mechanism comprises a microphone mounting frame 13, a sleeve 14, a locking spring 15 and a locking ring 16; wherein, the both ends screw hole symmetry installation sleeve 14 of microphone mounting bracket 13, locking spring 15, locking ring 16: one end of the sleeve 14 is in threaded connection with the microphone mounting frame 13, the locking spring 15 and the locking ring 16 are sleeved on the outer wall of the sleeve 14, one end of the locking spring 15 is attached to the microphone mounting frame 13, and the other end of the locking spring 15 is attached to the locking ring 16.
Threads are tapped at two ends of the long supporting column 1, one end of the long supporting column is in threaded connection with the base 4, and the other end of the long supporting column is in threaded connection with the cross beam 11; two column shoulders are arranged, one column shoulder is tightly attached to the top surface of the base 4, and the other column shoulder is tightly attached to the bottom surface of the support ring 3;
the screw thread is attacked at two ends of the short supporting column 2, one end of the short supporting column is in threaded connection with the base 4, the other end of the short supporting column is in threaded connection with the supporting ring 3, and a column shoulder is attached to the top surface of the base 4.
The support ring 3 is a circular thin plate part, and four holes are uniformly formed in the surface of the outer ring of the support ring: two of the two equal-diameter through holes are symmetrically provided and are matched with the long supporting column 1, and the other two equal-diameter threaded holes are symmetrically provided and are connected with the short supporting column 2; three through holes with the same diameter are arranged on the surface of the inner ring at equal intervals and used for mounting a sound component;
the base 4 is a circular thin plate part, and four equal-diameter through holes are formed in the surface of the base and used for installing the long supporting columns 1 and the short supporting columns 2.
The rotor 5 is a hollow component and is in a stepped cylinder shape, the outer surface of a first-step large cylinder is matched with the inner surface of the top cover 6, two equal-diameter cylindrical holes 5-1 are symmetrically formed in the outer surface of the first-step large cylinder along the diameter, the cylindrical holes 5-1 are matched with a compression spring 9 and a top ball 10, and a scale mark I5-2 is arranged on the end surface of the top of the first-step large cylinder; the inner wall of the second-stage small cylinder is provided with tooth sheets I5-3 which are matched with the central shaft 7 and are distributed at equal intervals;
the top cover 6 consists of an inner cylinder and an outer ring arranged along the periphery of the inner cylinder; the outer surface of the lower cylinder body of the inner cylinder is matched with the inner surface of a middle cylinder 11-2 of the cross beam 11, the bottom end surface of the inner cylinder is attached to the end surface of the outer ring of the bearing 8, the inner wall of the upper cylinder body of the inner cylinder is provided with a ring groove 6-1 matched with the top bead 10, and the top end surface of the inner cylinder is provided with four scale marks II 6-2 for aligning to the scale marks I5-2 on the rotor 5; four threaded holes with equal diameter are formed around the outer circular ring and used for connecting a cylinder 11-2 in the beam 11;
the central shaft 7 is a hollow component, the outer surface of one end of the central shaft is provided with threads matched with the microphone mounting rack 13, the other end of the central shaft is provided with four toothed sheets II 7-1 in a tooth shape and matched with the rotor 5, and the four toothed sheets II 7-1 are distributed at equal intervals along the circumference of the shaft; having a shoulder for abutting against the two bearings 8;
the top ball 10 is composed of a cylindrical connecting part 10-1 and a hemispherical tip 10-2, the cylindrical connecting part 10-1 is sleeved with a compression spring 9, and the hemispherical tip 10-2 is attached to the annular groove 6-1.
The ring groove 6-1 is used as a moving track of the top bead 10, one spherical groove 6-1-1 is arranged at intervals of 90 degrees, and a scale mark II 6-2 is superposed with the diameter of 1 spherical groove 6-1-1.
The beam 11 is a symmetrical member and consists of a cylinder 11-2 and two beam arms 11-1 arranged along the periphery of the cylinder 11-2; one end of the beam arm 11-1 is connected with the cylinder 11-2, the other end of the beam arm 11-1 is provided with a threaded hole for connecting the long support column 1 in the support, the bottom end face of the cylinder 11-2 is provided with four threaded holes with equal diameter for installing the bottom cover 12, and the top end face of the cylinder 11-2 is provided with four threaded holes with equal diameter for installing the top cover 6.
The microphone mounting rack 13 is a plate, a through hole is formed in the middle of the microphone mounting rack and is matched with the central shaft 7 of the rotating mechanism, and threaded holes with equal diameters are symmetrically formed in the two sides of the microphone mounting rack through the middle through hole and are used for mounting the sleeve 14;
the sleeve 14 comprises a threaded connection part 14-1 and a clamping part 14-2 consisting of clamping sheets 14-2-1 distributed at equal intervals along the circumference of one end of the threaded connection part 14-1; the outer surface of the threaded connecting part 14-1 is cylindrical, the other end of the threaded connecting part 14-1 serves as a threaded end to be connected with the microphone mounting frame 13, the initial outer surface of the end, connected with the threaded connecting part 14-1, of the clamping part 14-2 is conical, and the outer surface of the tail end of the clamping part 14-2 is cylindrical; the inner surface of the sleeve 14 is a cylinder with the same diameter and is matched with the microphone;
the locking ring 16 is a hollow stepped cylindrical structure, the outer surface of the locking ring is sleeved with a locking spring 15, one section of the inner surface of the locking ring is a cylindrical cylinder with the same diameter and is matched with the outer surface of the connecting part 14-1, the other section of the inner surface of the locking ring is conical, and the locking ring is matched with the conical outer surface of the clamping part 14-2 in a locking state.
The invention has the beneficial effects that: the positions of the reference microphone, the microphone to be calibrated and the loudspeaker which participate in the experiment are relatively fixed, so that the calibration error caused by the position error of the calibration experiment microphone can be effectively reduced; and the locking clamping mechanism is driven to rotate 180 degrees according to a specific track by rotating the rotor, so that the positions of the microphones are exchanged, and the experimental efficiency is improved.
Drawings
FIG. 1 is a schematic view of the overall assembly of the present invention;
FIG. 2 is a schematic view of a rotary mechanism assembly of the present invention;
FIG. 3 is a schematic view of the locking fixture assembly of the present invention;
FIG. 4 is a schematic view of a long support column according to the present invention;
FIG. 5 is a schematic view of a short support post structure according to the present invention;
FIG. 6 is a schematic view of a support ring according to the present invention;
FIG. 7 is a schematic view of a base structure according to the present invention;
FIG. 8 is a schematic view of a rotor according to the present invention;
FIG. 9 is a schematic view of the top cover structure of the present invention;
FIG. 10 is a schematic view of the bottom cover structure of the present invention;
FIG. 11 is a schematic view of the structure of the mandrel of the present invention;
FIG. 12 is a schematic view of the structure of a knob bead according to the present invention;
FIG. 13 is a schematic view of a cross beam structure according to the present invention;
FIG. 14 is a schematic view of a microphone mounting bracket configuration of the present invention;
FIG. 15 is a schematic view of the sleeve structure of the present invention;
FIG. 16 is a schematic view of a locking ring of the present invention;
the reference numbers in the figures are: 1: long support column, 2: short support column, 3: support ring, 4: base, 5: rotor, 5-1: cylindrical hole, 5-2: scale mark I, 5-3: tooth piece I, 6: top cover, 6-1: ring groove, 6-1-1: spherical groove, 6-2: scale lines ii, 7: central axis, 7-1: tooth pieces II and 8: bearing, 9: compression spring, 10: top bead, 10-1: cylindrical connecting part, 10-2: hemispherical apex, 11: beam, 11-1: beam arm, 11-2: cylinder, 12: bottom cover, 13: microphone mount, 14: sleeve, 14-1: threaded connection, 14-2: clamping portion, 14-2-1: clamping piece, 15: locking spring, 16: locking ring, 17: reference microphone, 18: the microphone is to be calibrated.
Detailed Description
The invention will be further described with reference to the following figures and examples, without however restricting the scope of the invention thereto.
Example 1: as shown in fig. 1 to 16, a microphone calibration jig comprises a bracket, a rotating mechanism and a locking and clamping mechanism for mounting a microphone; the bracket is used for supporting the rotating mechanism and the sound production component; the rotating mechanism is used for supporting the locking and clamping mechanism and driving the locking and clamping mechanism to rotate; and the locking and clamping mechanism is used for locking and clamping the microphone.
Further, the support can be arranged to comprise a long support column 1, a short support column 2, a support ring 3 and a base 4; wherein two long support columns 1 pass through the support ring 3 and are placed along the diameter symmetry, the bases 4 locked by nuts are installed at the lower ends of the long support columns 1 at the two ends, the upper ends of the two long support columns 1 are in threaded connection with the two ends of the middle cross beam 11 of the rotating mechanism, the upper ends of the two short support columns 2 are connected with threaded holes at the diameter symmetry positions of the support ring 3, and the bases 4 locked by nuts are installed at the lower ends of the two short support columns 2.
Further, the rotating mechanism can be arranged to comprise a rotor 5, a top cover 6, a central shaft 7, a bearing 8, a compression spring 9, a top ball 10, a cross beam 11 and a bottom cover 12; the horizontal microphone mounting structure comprises a beam 11, a bottom cover 12, a top cover 6, two bearings 8, a bearing 8 outer ring, a bearing 8 inner wall, a central shaft 7, a bearing 8 inner ring, a rotor 5 rack-shaped structure, a rotor 5 outer wall, a top ball 10, a compression spring 9, a top ball 10, a circular hole, a circular groove 6-1 of the top cover 6 and a microphone mounting frame 13, wherein the bottom end of the cylinder 11-2 in the beam 11 is connected with the bottom cover 12 through screws, the top end of the cylinder 11-2 in the beam 11 is connected with the top cover 6 through screws, the two bearings 8 are installed in the cylinder 11-2, the outer ring of the bearing 8 is in interference fit with the inner ring of the central shaft 7, the upper.
Further, the locking clamping mechanism may be provided to include a microphone mounting bracket 13, a sleeve 14, a locking spring 15 and a locking ring 16; wherein, the both ends screw hole symmetry installation sleeve 14 of microphone mounting bracket 13, locking spring 15, locking ring 16: one end of the sleeve 14 is in threaded connection with the microphone mounting frame 13, the locking spring 15 and the locking ring 16 are sleeved on the outer wall of the sleeve 14, one end of the locking spring 15 is attached to the microphone mounting frame 13, and the other end of the locking spring 15 is attached to the locking ring 16.
Furthermore, threads can be arranged on two ends of the long support column 1, one end of the long support column is in threaded connection with the base 4, and the other end of the long support column is in threaded connection with the cross beam 11; two column shoulders are arranged, one column shoulder is tightly attached to the top surface of the base 4, and the other column shoulder is tightly attached to the bottom surface of the support ring 3; the screw thread is attacked at two ends of the short supporting column 2, one end of the short supporting column is in threaded connection with the base 4, the other end of the short supporting column is in threaded connection with the supporting ring 3, and a column shoulder is attached to the top surface of the base 4.
Further, the support ring 3 may be a circular thin plate member, and four holes are uniformly formed on the outer circumferential surface of the support ring: two of the two equal-diameter through holes are symmetrically provided and are matched with the long supporting column 1, and the other two equal-diameter threaded holes are symmetrically provided and are connected with the short supporting column 2; three through holes with the same diameter are arranged on the surface of the inner ring at equal intervals and are used for installing sound production components (such as a loudspeaker); the base 4 is a circular thin plate part, and four equal-diameter through holes are formed in the surface of the base and used for installing the long supporting column 1 and the short supporting column 2 to stabilize the whole calibration clamp and support the loudspeaker.
Furthermore, the rotor 5 can be arranged to be a hollow component and be in a stepped cylinder shape, the outer surface of a first-step large cylinder is matched with the inner surface of the top cover 6, two equal-diameter cylindrical holes 5-1 are symmetrically formed in the outer surface of the first-step large cylinder along the diameter, the cylindrical holes 5-1 are matched with the compression spring 9 and the top bead 10, and the end face of the top of the first-step large cylinder is provided with a scale mark I5-2; the inner wall of the second-stage small cylinder is provided with tooth sheets I5-3 which are matched with the central shaft 7 and are distributed at equal intervals; the top cover 6 consists of an inner cylinder and an outer ring arranged along the periphery of the inner cylinder; the outer surface of the lower cylinder body of the inner cylinder is matched with the inner surface of a middle cylinder 11-2 of the cross beam 11, the bottom end surface of the inner cylinder is attached to the end surface of the outer ring of the bearing 8, the inner wall of the upper cylinder body of the inner cylinder is provided with a ring groove 6-1 matched with the top bead 10, and the top end surface of the inner cylinder is provided with four scale marks II 6-2 for aligning to the scale marks I5-2 on the rotor 5; four threaded holes with equal diameter are formed around the outer circular ring and used for connecting a cylinder 11-2 in the beam 11; the central shaft 7 is a hollow component, the outer surface of one end of the central shaft is provided with threads matched with the microphone mounting rack 13, the other end of the central shaft is provided with four toothed sheets II 7-1 in a tooth shape and matched with the rotor 5, and the four toothed sheets II 7-1 are distributed at equal intervals along the circumference of the shaft; a shoulder for abutting two bearings 8 (i.e., one bearing bottom surface abutting the shoulder top surface and one bearing top surface abutting the shoulder bottom surface); the top ball 10 is composed of a cylindrical connecting part 10-1 and a hemispherical tip 10-2, the cylindrical connecting part 10-1 is sleeved with a compression spring 9, and the hemispherical tip 10-2 is attached to the annular groove 6-1.
Further, the ring groove 6-1 can be set to serve as a moving track of the top ball 10, one spherical groove 6-1-1 is provided every 90 degrees, and one scale mark ii 6-2 is overlapped with the diameter of 1 spherical groove 6-1-1 (that is, one scale mark is used for corresponding to one spherical groove to realize the position location of the spherical groove, so that the top ball 10 can enter the spherical groove after moving for a corresponding angle).
Furthermore, the beam 11 can be a symmetrical member, and is composed of a cylinder 11-2 and two beam arms 11-1 arranged along the periphery of the cylinder 11-2; one end of the beam arm 11-1 is connected with the cylinder 11-2, the other end of the beam arm 11-1 is provided with a threaded hole for connecting the long support column 1 in the support, the bottom end face of the cylinder 11-2 is provided with four threaded holes with equal diameter for installing the bottom cover 12, and the top end face of the cylinder 11-2 is provided with four threaded holes with equal diameter for installing the top cover 6.
Further, the microphone mounting frame 13 can be arranged as a plate, a through hole is formed in the middle of the microphone mounting frame and is matched with the central shaft 7 of the rotating mechanism, and threaded holes with equal diameters are symmetrically formed in the two sides of the microphone mounting frame through the middle through hole and are used for mounting the sleeve 14; the sleeve 14 comprises a threaded connection part 14-1 and a clamping part 14-2 consisting of clamping sheets 14-2-1 distributed at equal intervals along the circumference of one end of the threaded connection part 14-1; the outer surface of the threaded connecting part 14-1 is cylindrical, the other end of the threaded connecting part 14-1 serves as a threaded end to be connected with the microphone mounting frame 13, the initial outer surface of the end, connected with the threaded connecting part 14-1, of the clamping part 14-2 is conical, and the outer surface of the tail end of the clamping part 14-2 is cylindrical; the inner surface of the sleeve 14 is a cylinder of equal diameter to fit the microphone (i.e. one sleeve 14 fits the spherical-grooved reference microphone 17 and the other sleeve 14 fits the microphone to be calibrated); the locking ring 16 is a hollow stepped cylindrical structure, the outer surface of the locking ring is sleeved with a locking spring 15, one section of the inner surface of the locking ring is a cylindrical cylinder with the same diameter and is matched with the outer surface of the connecting part 14-1, the other section of the inner surface of the locking ring is conical, and the locking ring is matched with the conical outer surface of the clamping part 14-2 in a locking state.
The working process of the invention is as follows:
1. the operator places the microphone calibration jig on the (semi-) anechoic indoor platform and mounts the loudspeaker on the support ring 3 of the microphone calibration jig. The locking ring 16 is first pushed up to compress the locking spring 15 to loosen the holding tab 14-2-1 of the sleeve holding portion 14-2, then the microphone is installed in the sleeve 14, and after the microphone is installed in place, the locking ring is slowly released to lock the holding tab of the sleeve, and after the holding tab is locked, the microphone in the sleeve is also clamped.
2. After the microphone and the loudspeaker are installed, the loudspeaker works to emit specified sound, and an operator can acquire a sound pressure signal through the microphone; then, an operator manually rotates the rotor 180 degrees until the scale marks on the rotor and the top cover coincide, the position of the microphone is exchanged, and the sound pressure signal is collected again (about rotation, specifically, a tooth piece I5-3 of the rotor 5 is matched with a tooth piece II 7-1 of a central shaft 7, the central shaft 7 is in threaded connection with a locking clamping mechanism, when the rotor 5 is subjected to a torque, the rotor 5 rotates, the rotor 5 drives the central shaft 7 to rotate, the central shaft 7 drives the locking clamping mechanism to rotate, a first-step large cylindrical surface of the rotor 5 is provided with a compression spring 9 and a top ball 10, the top ball 10 is constrained in an annular groove 6-1 of the top cover 6 to move, and when the rotor 5 rotates 90 degrees, the top ball 10 is clamped in a spherical groove 6-1-1 on the annular groove 6-1 under the pressure of the compression spring 9).
3. The operating personnel pushes up the locking ring, compresses tightly locking spring to let the centre gripping piece of sleeve clamping part relax, then pull down the microphone, calibration experiment finishes.
4. Processing two sound pressure signals acquired before the exchange of the reference microphone and the microphone to be calibrated and two sound pressure signals acquired after the exchange to obtain a correction function of the microphone to be calibrated:
while the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. A clamp for calibrating a microphone is characterized in that: comprises a bracket, a rotating mechanism and a locking and clamping mechanism for mounting a microphone;
the bracket is used for supporting the rotating mechanism and the sound production component;
the rotating mechanism is used for supporting the locking and clamping mechanism and driving the locking and clamping mechanism to rotate;
the locking and clamping mechanism is used for locking and clamping the microphone;
the rotating mechanism comprises a rotor (5), a top cover (6), a central shaft (7), a bearing (8), a compression spring (9), a top ball (10), a cross beam (11) and a bottom cover (12); the horizontal bearing device is characterized in that a beam (11) is horizontally placed, the bottom end of a cylinder (11-2) in the beam (11) is connected with a bottom cover (12) through screws, the top end of the cylinder (11-2) in the beam (11) is connected with a top cover (6) through screws, two bearings (8) are installed in the cylinder (11-2), the outer ring of each bearing (8) is in interference fit with the inner wall of the cylinder (11-2), a central shaft (7) is in interference fit with the inner ring of the corresponding bearing (8), the upper end of the central shaft (7) is meshed with a rack-shaped structure of a rotor (5), the outer wall of the rotor (5) is in clearance fit with the top cover (6), a top ball (10) and a compression spring (9) are installed in a round hole in the outer wall of the rotor (5), one end of the top ball (10) is tightly attached to a ring groove (6.
2. The jig for calibrating a microphone according to claim 1, wherein: the support comprises a long support column (1), a short support column (2), a support ring (3) and a base (4); wherein two long support columns (1) pass the lock ring (3) and are placed along the diameter symmetry, the base (4) by nut locking is installed to both ends long support column (1) lower extreme, two long support column (1) upper end threaded connection rotary mechanism intermediate cross beam (11) both ends, two short support column (2) upper ends are connected with the screw hole at lock ring (3) diameter symmetry position, base (4) by nut locking is installed to two short support column (2) lower extreme.
3. The jig for calibrating a microphone according to claim 1, wherein: the locking and clamping mechanism comprises a microphone mounting frame (13), a sleeve (14), a locking spring (15) and a locking ring (16); wherein, the two threaded holes at the two ends of the microphone mounting rack (13) are symmetrically provided with a sleeve (14), a locking spring (15) and a locking ring (16): one end of the sleeve (14) is in threaded connection with the microphone mounting frame (13), the locking spring (15) and the locking ring (16) are sleeved on the outer wall of the sleeve (14), one end of the locking spring (15) is attached to the microphone mounting frame (13), and the other end of the locking spring (15) is attached to the locking ring (16).
4. The jig for microphone calibration as defined in claim 2, wherein:
threads are tapped at two ends of the long supporting column (1), one end of the long supporting column is in threaded connection with the base (4), and the other end of the long supporting column is in threaded connection with the cross beam (11); two column shoulders are arranged, one column shoulder is tightly attached to the top surface of the base (4), and the other column shoulder is tightly attached to the bottom surface of the support ring (3);
the screw thread is attacked at both ends of the short supporting column (2), one end of the short supporting column is in threaded connection with the base (4), the other end of the short supporting column is in threaded connection with the supporting ring (3), and a column shoulder is attached to the top surface of the base (4).
5. The jig for microphone calibration as defined in claim 2, wherein:
the support ring (3) is a circular thin plate part, and four holes are uniformly formed in the surface of the outer ring of the support ring: two of the two through holes are symmetrically provided with two equal-diameter through holes which are matched with the long supporting columns (1), and the other two through holes are symmetrically provided with two equal-diameter threaded holes which are connected with the short supporting columns (2); three through holes with the same diameter are arranged on the surface of the inner ring at equal intervals and used for mounting a sound component;
the base (4) is a circular thin plate part, and four equal-diameter through holes are formed in the surface of the base and used for installing the long supporting columns (1) and the short supporting columns (2).
6. The jig for calibrating a microphone according to claim 1, wherein: the rotor (5) is a hollow component and is in a stepped cylinder shape, the outer surface of a first-step large cylinder is matched with the inner surface of the top cover (6), two cylinder holes (5-1) with equal diameters are symmetrically formed in the outer surface of the first-step large cylinder along the diameter, the cylinder holes (5-1) are matched with a compression spring (9) and a top bead (10), and the end surface of the top of the first-step large cylinder is provided with a scale mark I (5-2); the inner wall of the second-step small cylinder is provided with tooth sheets I (5-3) which are matched with the central shaft (7) and are distributed at equal intervals;
the top cover (6) consists of an inner cylinder and an outer ring arranged along the periphery of the inner cylinder; the outer surface of the lower cylinder body of the inner cylinder is matched with the inner surface of a middle cylinder (11-2) of the cross beam (11), the bottom end surface of the inner cylinder is tightly attached to the end surface of the outer ring of the bearing (8), the inner wall of the upper cylinder body of the inner cylinder is provided with a ring groove (6-1) matched with the top bead (10), and the top end surface of the inner cylinder is provided with four scale marks II (6-2) for aligning with the scale marks I (5-2) on the rotor (5); four threaded holes with equal diameter are formed around the outer circular ring and used for connecting a cylinder (11-2) in the cross beam (11);
the central shaft (7) is a hollow component, the outer surface of one end of the central shaft is provided with a thread matched with the microphone mounting rack (13), the other end of the central shaft is provided with four toothed sheets II (7-1) in a tooth shape and matched with the rotor (5), and the four toothed sheets II (7-1) are distributed at equal intervals along the circumference of the shaft; has a shaft shoulder for abutting against the two bearings (8);
the top bead (10) is composed of a cylindrical connecting part (10-1) and a hemispherical tip (10-2), the cylindrical connecting part (10-1) is sleeved with a compression spring (9), and the hemispherical tip (10-2) is attached to the annular groove (6-1).
7. The jig for calibrating a microphone according to claim 6, wherein: the ring groove (6-1) is used as a moving track of the top bead (10), one spherical groove (6-1-1) is arranged at intervals of 90 degrees, and one scale mark II (6-2) is superposed with the diameter of 1 spherical groove (6-1-1).
8. The jig for calibrating a microphone according to claim 1, wherein: the beam (11) is a symmetrical member and consists of a cylinder (11-2) and two beam arms (11-1) arranged along the periphery of the cylinder (11-2); one end of the beam arm (11-1) is connected with the cylinder (11-2), the other end of the beam arm (11-1) is provided with a threaded hole for connecting the long support column (1) in the support, the bottom end face of the cylinder (11-2) is provided with four equal-diameter threaded holes for installing the bottom cover (12), and the top end face of the cylinder (11-2) is provided with four equal-diameter threaded holes for installing the top cover (6).
9. The jig for microphone calibration as defined in claim 3, wherein:
the microphone mounting rack (13) is a plate, a through hole is formed in the middle of the microphone mounting rack and matched with the central shaft (7) in the rotating mechanism, and threaded holes with equal diameters are symmetrically formed in the two sides of the microphone mounting rack through the middle through hole and used for mounting a sleeve (14);
the sleeve (14) comprises a threaded connecting part (14-1) and a clamping part (14-2) consisting of clamping sheets (14-2-1) distributed at equal intervals along the circumference of one end of the threaded connecting part (14-1); the outer surface of the threaded connecting part (14-1) is cylindrical, the other end of the threaded connecting part (14-1) is used as a threaded end to be connected with the microphone mounting rack (13), the initial outer surface of one end, connected with the threaded connecting part (14-1), of the clamping part (14-2) is conical, and the outer surface of the tail end of the clamping part (14-2) is cylindrical; the inner surface of the sleeve (14) is a cylindrical cylinder with the same diameter and is matched with the microphone;
the locking ring (16) is of a hollow stepped cylindrical structure, the outer surface of the locking ring is sleeved with a locking spring (15), one section of the inner surface of the locking ring is a cylindrical cylinder with the same diameter and is matched with the outer surface of the connecting part (14-1), the other section of the inner surface of the locking ring is conical and is matched with the conical outer surface of the clamping part (14-2) in a locking state.
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| CN201910336892.5A CN110166921B (en) | 2019-04-25 | 2019-04-25 | Fixture for microphone calibration |
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| CN201910336892.5A CN110166921B (en) | 2019-04-25 | 2019-04-25 | Fixture for microphone calibration |
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| CN113959559A (en) * | 2021-11-08 | 2022-01-21 | 陕西省计量科学研究院 | Turntable of sound level meter calibrating device |
| CN114422927B (en) * | 2021-12-13 | 2024-05-24 | 中国航空工业集团公司北京长城计量测试技术研究所 | Microphone calibrating device of variable temperature |
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