CN115022788A - Vibrating diaphragm tension device for controlling measuring microphone and vibrating diaphragm method thereof - Google Patents
Vibrating diaphragm tension device for controlling measuring microphone and vibrating diaphragm method thereof Download PDFInfo
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- CN115022788A CN115022788A CN202210924443.4A CN202210924443A CN115022788A CN 115022788 A CN115022788 A CN 115022788A CN 202210924443 A CN202210924443 A CN 202210924443A CN 115022788 A CN115022788 A CN 115022788A
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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
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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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
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
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- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
A vibration diaphragm tension device for controlling a measuring microphone and a vibration diaphragm method thereof comprise a fixing device, a shell and a base which are sequentially connected, wherein a static exciter is arranged in the fixing device, a vibration diaphragm arranged in parallel with the static exciter is arranged at the top of the shell, and the static exciter and the vibration diaphragm are arranged in an insulating way; the shell is communicated with the base, and a signal converter arranged towards the vibrating diaphragm is arranged in the base; the signal converter is electrically connected with an audio analyzer, and the audio analyzer is electrically connected with an electrostatic excitation power supply connected with the electrostatic exciter; the shell is provided with a vibrating diaphragm ring for adjusting the tension of the vibrating diaphragm; compared with the prior art, thereby through the tension of audio analyzer analysis resonant frequency analysis vibrating diaphragm, realize that the resonant frequency of control vibrating diaphragm can control the tension of vibrating diaphragm to carry out the testing process to the resonant frequency of vibrating diaphragm in proper order, ensure the uniformity of vibrating diaphragm.
Description
Technical Field
The invention relates to the technical field of circuit channel frequency oscillation, in particular to a vibrating diaphragm tension device for controlling a measuring microphone and a vibrating diaphragm method thereof.
Background
The eardrum in the ears of people and animals is very sensitive to air vibration, when the energy of the air vibration drives the eardrum to vibrate, the eardrum converts sound signals into bioelectricity signals, the bioelectricity signals are transmitted to the brain, and the brain analyzes and understands the received signals, so that the sound is sensed and fed back. An important role in an acoustic system is that of a microphone, an electroacoustic transducer device in a gaseous medium which converts acoustic signals into corresponding electrical signals.
A measuring microphone is an acousto-electric transducer for measuring sound pressure under defined operating conditions, the sensitivity response of which is known. Generally, the sensor is required to have the characteristics of high sensitivity, wide and flat frequency response, good stability, large dynamic range, small distortion and the like. And requires a small volume, approximately non-directional, to avoid disturbing the measured sound field.
In a specific use, the measuring microphone is a microphone that operates with a change in capacitance. The capacitor of the microphone is inversely proportional to the distance between the back polar plate and the vibrating diaphragm, when the microphone is excited by sound pressure, the vibrating diaphragm can deform and get close to or away from the back polar plate, at the moment, the capacitance changes, and the change of the capacitor is converted into the change of voltage.
When sound waves are incident to the microphone diaphragm from different angles, acting forces borne by the diaphragm are different, so that corresponding output is different, in the batch production process of the measuring microphone, the tension of the diaphragm cannot be well controlled, the consistency of products is poor, the diaphragm of the measuring microphone needs to be calibrated in sequence after the production of the measuring microphone is completed, time and labor are wasted, the cost is increased, and the production efficiency of the measuring microphone is also influenced.
Chinese patent No. CN205249481U discloses a film stretching tool for producing electret microphone diaphragms, which comprises an annular base, a spiral ring and a gland, wherein the longitudinal section of the annular base is of two L-shaped structures in opposite directions, the spiral ring is connected to the outer ring of the annular base through threads and can move up and down through threads, an annular groove is formed in the spiral ring, a rubber ring is arranged in the groove, a gasket is arranged at the top of the annular base, the gasket is sleeved on the inner ring of the spiral ring, an annular protrusion is arranged on the gland, the annular protrusion can be buckled in the groove, and a diaphragm is pressed between the gland and the spiral ring.
The tension adjustment of the vibrating diaphragm is realized by upwards or downwards rotating the spiral rings, but in the batch production process of the measuring microphones, certain precision errors exist in each spiral ring, so that the tension adjustment quantity of different measuring microphones is influenced, and the accurate tension adjustment of the measuring microphones in batch production cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the vibrating diaphragm tension device for controlling the measuring microphone and the vibrating diaphragm method thereof, which have the advantages of simple structure, accurate measurement and good consistency of products.
In order to achieve the purpose, the invention adopts the following technical scheme: a vibrating diaphragm tension device for controlling a measuring microphone comprises a fixing device, a shell and a base which are sequentially connected, wherein a static exciter is arranged in the fixing device, a vibrating diaphragm arranged in parallel with the static exciter is arranged at the top of the shell, and the static exciter and the vibrating diaphragm are arranged in an insulating mode; the shell is communicated with the base, and a signal converter arranged towards the vibrating diaphragm is arranged in the base; the signal converter is electrically connected with an audio analyzer, and the audio analyzer is electrically connected with an electrostatic excitation power supply connected with the electrostatic exciter; and the shell is provided with a vibrating diaphragm ring for adjusting the tension of the vibrating diaphragm.
As a preferable aspect of the present invention, the fixing device is an insulating structure, a capacitance is generated between the electrostatic actuator and the diaphragm, and a distance between the electrostatic actuator and the diaphragm is 0.5mm to 2 mm.
As a preferred aspect of the present invention, an output cable connected to the audio analyzer is disposed between the audio analyzer and the electrostatic excitation power supply, and the output sweep frequency signal of the audio analyzer is transmitted to the electrostatic excitation power supply through the output cable.
As a preferred aspect of the present invention, a transmission cable connected to the electrostatic excitation power supply is disposed between the electrostatic excitation power supply and the electrostatic actuator, and the electrostatic excitation power supply amplifies the sweep frequency signal and superimposes the sweep frequency signal on a current and a voltage generated by the electrostatic excitation power supply itself to generate the offset alternating current signal.
As a preferable scheme of the invention, the electrostatic excitation power supply amplifies the sweep frequency signal by 50-100 times, and the direct current voltage generated by the electrostatic excitation power supply is 500VDC-1200 VDC.
As a preferred aspect of the present invention, after the electrostatic actuator receives the offset ac signal through the transmission cable, an induced charge is generated between the electrostatic actuator and the diaphragm.
As a preferred scheme of the present invention, the diaphragm ring compresses the diaphragm, and the diaphragm ring is in threaded connection with the housing.
In a preferred embodiment of the present invention, the signal converter comprises a preamplifier and a measuring microphone connected to each other.
A control method for controlling the tension of a diaphragm of a measuring microphone, comprising the steps of:
step S1: the method comprises the following steps of sequentially connecting a fixing device, a shell and a base, placing an electrostatic exciter in the fixing device in an insulating mode, installing a vibrating diaphragm corresponding to the electrostatic exciter on the top of the shell, installing a signal converter in the base, electrically connecting the electrostatic exciter with an electrostatic excitation power supply, electrically connecting the signal converter with an audio analyzer, and electrically connecting the audio analyzer with the electrostatic excitation power supply;
step S2: the audio analyzer outputs a frequency sweeping signal, and the frequency sweeping signal is transmitted to the electrostatic excitation power supply through an output cable;
step S3: after receiving the sweep frequency signal, the electrostatic excitation power supply amplifies the sweep frequency signal by 50-100 times, and superposes the sweep frequency signal with the direct current voltage of 500VDC-1200VDC generated by the electrostatic excitation power supply to generate a high-voltage biased alternating current signal which is transmitted to the electrostatic exciter through a transmission cable;
step S4: the electrostatic exciter and the vibrating diaphragm are arranged in parallel, the electrostatic exciter and the vibrating diaphragm are insulated through the fixing device, the electrostatic exciter and the vibrating diaphragm form a capacitor after the electrostatic exciter receives a high-voltage biased alternating-current signal, and the distance between the electrostatic exciter and the vibrating diaphragm is 0.5mm-2 mm;
step S5: after the electrostatic actuator receives the high-voltage biased alternating-current signal, inductive charges are generated between the electrostatic actuator and the vibrating diaphragm, and coulomb force generated by the change of the two inductive charges pulls the vibrating diaphragm to deform;
step S6: the generated coulomb force enables the diaphragm to generate vibration with corresponding frequency, and the diaphragm vibrates to generate a sound signal;
step S7: the sound signal is transmitted to the signal converter through the shell and the base, the signal converter converts the sound signal into an electric signal, and the electric signal is transmitted to the audio analyzer through the input cable for data analysis;
step S8: the audio analyzer performs data analysis according to the sampled signals and analyzes the resonant frequency of the vibrating diaphragm;
step S9: the tension of the vibrating diaphragm can be adjusted through the vibrating diaphragm ring, and the tension of the vibrating diaphragm can be controlled by controlling the resonant frequency of the vibrating diaphragm.
In a preferred embodiment of the present invention, the signal converter in step S7 includes a preamplifier and a measuring microphone connected to each other, and the measuring microphone converts an acoustic signal into an electrical signal, and the electrical signal is impedance-converted by the preamplifier and then transmitted to the audio analyzer via the input cable for data analysis.
Compared with the prior art, the invention has the beneficial effects that:
1. the alternating coulomb force is generated between the vibrating diaphragm and the electrostatic actuator through static electricity, so that the vibrating diaphragm is excited to vibrate to generate a corresponding sound signal, the sound signal is tested through measuring the pressure environment of the microphone, the whole structure is simple, and the operation is convenient.
2. Thereby through the tension of audio analyzer analysis resonant frequency analysis vibrating diaphragm, realize that the resonant frequency of control vibrating diaphragm can control the tension of vibrating diaphragm to carry out the testing process to the resonant frequency of vibrating diaphragm in proper order, ensure the uniformity of vibrating diaphragm.
Drawings
FIG. 1 is a schematic structural view of the present invention;
reference numerals: an electrostatic actuator 101, a transmission cable 102, an electrostatic excitation power supply 103, an output cable 104, an audio analyzer 105, an input cable 106, a base 107, a preamplifier 108, a measurement microphone 109, a fixing device 110, a housing 201, a diaphragm ring 202, a diaphragm 203, a housing cavity 301, a through hole 302, and a base cavity 303.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, a control device for controlling tension of a diaphragm of a measuring microphone includes a fixing device 110, a housing 201, and a base 107, which are connected in sequence, wherein an electrostatic actuator 101 is disposed in the fixing device 110, a diaphragm 203 disposed in parallel with the electrostatic actuator 101 is disposed on the top of the housing 201, and the electrostatic actuator 101 and the diaphragm 203 are disposed in an insulating manner; the shell 201 is communicated with the base 107, and a signal converter arranged towards the diaphragm 203 is arranged in the base 107; the signal converter is electrically connected with an audio analyzer 105, and the audio analyzer 105 is electrically connected with an electrostatic excitation power supply 103 connected with the electrostatic exciter 101; a diaphragm ring 202 for adjusting the tension of the diaphragm 203 is arranged on the shell 201.
The fixing device 110 is connected to the top of the casing 201, the fixing device 110, the casing 201 and the base 107 are sequentially connected from top to bottom, the fixing device 110, the casing 201 and the base 107 are connected to the same straight line, the fixing device 110 and the base 107 are connected to two opposite ends of the casing 201, the fixing device 110 can be made of insulating materials such as rubber and plastic, the bottom of the fixing device 110 is located between the electrostatic exciter 101 and the vibrating diaphragm 203, and meanwhile the fixing device 110 is arranged to wrap the electrostatic exciter 101.
The fixing device 110 is an insulating structure, capacitance is generated between the electrostatic actuator 101 and the diaphragm 203, the distance between the electrostatic actuator 101 and the diaphragm 203 is 0.5mm-2mm, a layer of non-conductive insulating medium is sandwiched between two conductors which are close to each other, so that a capacitor is formed, and under the condition that the electrostatic actuator 101 and the diaphragm 203 are both conductors, a layer of non-conductive insulating fixing device 110 is sandwiched between the electrostatic actuator 101 and the diaphragm 203, so that capacitance is generated between the electrostatic actuator 101 and the diaphragm 203.
An output cable 104 connected between the audio analyzer 105 and the electrostatic excitation power supply 103 is arranged, the audio analyzer 105 outputs a sweep frequency signal and transmits the sweep frequency signal to the electrostatic excitation power supply 103 through the output cable 104, an audio signal generator is arranged in the audio analyzer 105 and serves as an excitation signal source, and the excitation signal source outputs the sweep frequency signal and transmits the sweep frequency signal to the electrostatic excitation power supply 103 through the output cable 104.
A transmission cable 102 connected between the electrostatic excitation power supply 103 and the electrostatic actuator 101 is provided, and the electrostatic excitation power supply 103 amplifies the sweep signal and superimposes the sweep signal with the current and voltage generated by the electrostatic excitation power supply 103 itself to generate an offset type alternating current signal.
The electrostatic excitation power supply 103 amplifies the sweep frequency signal by 50-100 times, the direct current voltage generated by the electrostatic excitation power supply 103 is 500-1200 VDC, the electrostatic excitation power supply 103 is a power supply additionally arranged for meeting the working condition of the electrostatic exciter 101, and the electrostatic excitation power supply 103 is an alternating current/direct current power supply.
After the electrostatic actuator 101 receives the offset ac signal through the transmission cable 102, an induced charge is generated between the electrostatic actuator 101 and the diaphragm 203, since the capacitor stores a charge when a voltage is applied between two plates of the capacitor, and after the electrostatic actuator 101 receives the offset ac signal, the electrostatic actuator 101 generates a corresponding offset ac charge.
The diaphragm ring 202 compresses the diaphragm 203, the diaphragm ring 202 is in threaded connection with the shell 201, one end of the shell 201 supports the diaphragm 203, and the tension of the diaphragm 203 can be adjusted by adjusting the relative position of the diaphragm ring 202 and the shell 201 up and down.
The signal converter comprises a preamplifier 108 and a measuring microphone 109 which are connected, a sound signal is transmitted to the measuring microphone 109 through a through hole 302, a shell cavity 301 and the through hole 302, the measuring microphone 109 converts the sound signal into an electric signal, the electric signal is subjected to impedance conversion by the preamplifier 108, and the electric signal is transmitted to the audio analyzer 105 through the input cable 106 for data analysis.
A control method for controlling the tension of a diaphragm of a measuring microphone, comprising the steps of:
step S1: the fixing device 110, the shell 201 and the base 107 are connected in sequence, the electrostatic actuator 101 is placed in the fixing device 110 in an insulating mode, the vibrating diaphragm 203 corresponding to the electrostatic actuator 101 is installed on the top of the shell 201, the signal converter is installed in the base 107, the electrostatic actuator 101 is electrically connected with the electrostatic excitation power supply 103, the signal converter is electrically connected with the audio analyzer 105, and the audio analyzer 105 is also electrically connected with the electrostatic excitation power supply 103.
The signal converter, the audio analyzer 105, the electrostatic excitation power supply 103 and the electrostatic exciter 101 are sequentially connected through a channel cable, the fixing device 110 is a hollow box structure, the electrostatic exciter 101 is placed at the bottom of the fixing device 110, the signal converter is hung in the middle of the base 107, and the vibrating diaphragm 203 is arranged at the top of the shell 201 in a pressing mode through the vibrating diaphragm ring 202.
The fixing device 110 is made of an insulating material such as plastic, rubber, etc., and the bottom of the fixing device 110 is located between the electrostatic actuator 101 and the diaphragm 203.
Step S2: the audio analyzer 105 outputs a frequency sweep signal, which is transmitted to the electrostatic excitation power supply 103 through the output cable 104 without specific constraints in the frequency range and without specific constraints in the voltage amplitude.
Step S3: after receiving the frequency sweep signal, the electrostatic excitation power supply 103 amplifies the frequency sweep signal by 50-100 times, and superposes the frequency sweep signal with a direct current voltage of 500VDC-1200VDC generated by the electrostatic excitation power supply 103 itself to generate a high-voltage biased alternating current signal, which is transmitted to the electrostatic actuator 101 through the transmission cable 102.
The electrostatic excitation power supply 103 is a power supply that is added to satisfy the operating conditions of the electrostatic actuator 101, and the electrostatic excitation power supply 103 is an ac/dc power supply.
Step S4: the electrostatic actuator 101 and the diaphragm 203 are arranged in parallel, the electrostatic actuator 101 and the diaphragm 203 are insulated by the fixing device 110, after the electrostatic actuator 101 receives an alternating-current signal with high voltage bias, the electrostatic actuator 101 and the diaphragm 203 form a capacitor, and the distance between the electrostatic actuator 101 and the diaphragm 203 is 0.5mm-2 mm.
The electrostatic actuator 101 and the diaphragm 203 are ensured to be in a close state, and both the electrostatic actuator 101 and the diaphragm 203 are in a conductor structure.
Step S5: after the electrostatic actuator 101 receives the high-voltage biased alternating-current signal, the alternating-current signal is transmitted to the electrostatic actuator 101 through the transmission cable 102, induced charges are generated between the electrostatic actuator 101 and the diaphragm 203, and coulomb force generated by changes of the two induced charges pulls the diaphragm 203 to deform.
Coulomb force is the interaction force between statically charged bodies. The charged body can be regarded as being formed by a plurality of point charges, the interaction force between each pair of static point charges follows coulomb law, also called as electrostatic force, because the signal received by the electrostatic actuator 101 is a high-voltage biased alternating current signal, the direction and the magnitude of the current always change in real time, and thus the coulomb force received by the electrostatic actuator 101 and the diaphragm 203 changes in real time.
Step S6: the coulomb force generated causes the diaphragm 203 to vibrate at a corresponding frequency, the diaphragm 203 vibrates to generate an audio signal, and the amplitude frequency of coulomb force corresponds to the vibration frequency generated by the diaphragm 203, thereby causing the diaphragm 203 to vibrate to generate a corresponding audio signal frequency.
Step S7: the sound signal is transmitted through the housing 201 and the base 107 to the signal converter, which converts the sound signal into an electrical signal that is transmitted via the input cable 106 to the audio analyzer 105 for data analysis.
Step S8: the audio analyzer 105 performs data analysis according to the sampled signal to analyze the resonant frequency of the diaphragm 203.
Step S9: the tension of the diaphragm 203 is adjusted by the diaphragm ring 202, so that the resonance frequency of the diaphragm 203 is controlled, and the tension of the diaphragm 203 can be controlled.
The signal converter includes a preamplifier 108 and a measurement microphone 109 connected to each other, and the measurement microphone 109 converts an acoustic signal into an electric signal, and the electric signal is impedance-converted by the preamplifier 108 and then transmitted to the audio analyzer 105 via the input cable 106 to perform data analysis.
The diaphragm 203, the diaphragm ring 202 and the shell 201 are rigidly connected with the base 107, are electrically conductive and are grounded, and have better safety in use.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: electrostatic actuator 101, transmission cable 102, electrostatic actuation power supply 103, output cable 104, audio analyzer 105, input cable 106, base 107, preamplifier 108, measurement microphone 109, fixture 110, housing 201, diaphragm ring 202, diaphragm 203, housing cavity 301, through-hole 302, base cavity 303, and the like, without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A diaphragm tension device for controlling a measuring microphone comprises a fixing device (110), a shell (201) and a base (107) which are sequentially connected, and is characterized in that a static exciter (101) is arranged in the fixing device (110), a diaphragm (203) which is parallel to the static exciter (101) is arranged at the top of the shell (201), and the static exciter (101) and the diaphragm (203) are arranged in an insulating mode; the shell (201) is communicated with the base (107), and a signal converter arranged towards the vibrating diaphragm (203) is arranged in the base (107); the signal converter is electrically connected with an audio analyzer (105), and the audio analyzer (105) is electrically connected with an electrostatic excitation power supply (103) connected with the electrostatic exciter (101); and a diaphragm ring (202) for adjusting the tension of the diaphragm (203) is arranged on the shell (201).
2. A diaphragm tensioning device for a control measurement microphone according to claim 1, wherein the fixing means (110) is an insulating structure, a capacitance is generated between the electrostatic actuator (101) and the diaphragm (203), and the distance between the electrostatic actuator (101) and the diaphragm (203) is 0.5mm to 2 mm.
3. A diaphragm tension device for controlling a measuring microphone according to claim 1, wherein an output cable (104) is connected between the audio analyzer (105) and the electrostatic excitation power supply (103), and the output sweep frequency signal of the audio analyzer (105) is transmitted to the electrostatic excitation power supply (103) through the output cable (104).
4. A diaphragm tensioner as claimed in claim 3, wherein a transmission cable (102) is connected between the electrostatic excitation power supply (103) and the electrostatic actuator (101), and the electrostatic excitation power supply (103) amplifies the sweep frequency signal and superimposes the amplified sweep frequency signal with the current and voltage generated by the electrostatic excitation power supply (103) to generate the offset ac signal.
5. A diaphragm tensioning device for controlling a measuring microphone according to claim 4, wherein the electrostatic excitation power supply (103) amplifies the sweep frequency signal by a factor of 50 to 100, and the electrostatic excitation power supply (103) itself generates a DC voltage of 500VDC to 1200 VDC.
6. A diaphragm tensioning device for a control measurement microphone according to claim 3, wherein an induced charge is generated between the electrostatic actuator (101) and the diaphragm (203) upon receipt of the biased ac signal by the electrostatic actuator (101) via the transmission cable (102).
7. A diaphragm tensioning device for a control measurement microphone according to claim 6, characterized in that the diaphragm ring (202) presses the diaphragm (203) and the diaphragm ring (202) is screwed to the housing (201).
8. A diaphragm tensioning device for controlling a measuring microphone according to claim 1, characterized in that the signal converter comprises a preamplifier (108) and a measuring microphone (109) which are connected.
9. A diaphragm method for controlling a measuring microphone is characterized by comprising the following steps:
step S1: sequentially connecting a fixing device (110), a shell (201) and a base (107), placing an electrostatic exciter (101) in the fixing device (110) in an insulating mode, installing a vibrating diaphragm (203) corresponding to the electrostatic exciter (101) on the top of the shell (201), installing a signal converter in the base (107), electrically connecting the electrostatic exciter (101) with an electrostatic excitation power supply (103), electrically connecting the signal converter with an audio analyzer (105), and electrically connecting the audio analyzer (105) with the electrostatic excitation power supply (103);
step S2: the audio analyzer (105) outputs a frequency sweep signal, and the frequency sweep signal is transmitted to the electrostatic excitation power supply (103) through the output cable (104);
step S3: after receiving the sweep frequency signal, the electrostatic excitation power supply (103) amplifies the sweep frequency signal by 50-100 times, superposes the sweep frequency signal with the direct-current voltage 500VDC-1200VDC generated by the electrostatic excitation power supply (103) to generate a high-voltage biased alternating-current signal, and transmits the high-voltage biased alternating-current signal to the electrostatic exciter (101) through the transmission cable (102);
step S4: the electrostatic exciter (101) and the vibrating diaphragm (203) are arranged in parallel, the electrostatic exciter (101) and the vibrating diaphragm (203) are insulated through the fixing device (110), after the electrostatic exciter (101) receives a high-voltage biased alternating current signal, the electrostatic exciter (101) and the vibrating diaphragm (203) form a capacitor, and the distance between the electrostatic exciter (101) and the vibrating diaphragm (203) is 0.5mm-2 mm;
step S5: after the electrostatic actuator (101) receives the high-voltage biased alternating current signal, inductive charges are generated between the electrostatic actuator (101) and the diaphragm (203), and coulomb force is generated by the change of the two inductive charges to pull the diaphragm (203) to deform;
step S6: the generated coulomb force enables the diaphragm (203) to generate vibration with corresponding frequency, and the diaphragm (203) vibrates to generate a sound signal;
step S7: the sound signal is transmitted to a signal converter through the shell (201) and the base (107), the signal converter converts the sound signal into an electric signal, and the electric signal is transmitted to the audio analyzer (105) through the input cable (106) for data analysis;
step S8: the audio analyzer (105) performs data analysis according to the sampled signals and analyzes the resonant frequency of the diaphragm (203);
step S9: the tension of the diaphragm (203) is adjusted through the diaphragm ring (202), so that the resonance frequency of the diaphragm (203) is controlled, and the tension of the diaphragm (203) can be controlled.
10. A diaphragm method for controlling a measuring microphone according to claim 9, wherein the signal converter in step S7 comprises a pre-amplifier (108) and a measuring microphone (109) connected together, the measuring microphone (109) converts the acoustic signal into an electrical signal, and the electrical signal is transmitted to the audio analyzer (105) via the input cable (106) for data analysis after being impedance-converted by the pre-amplifier (108).
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| CN202210924443.4A CN115022788B (en) | 2022-08-03 | 2022-08-03 | Vibrating diaphragm tension device for controlling measuring microphone and vibrating diaphragm method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115824382A (en) * | 2023-02-13 | 2023-03-21 | 杭州兆华电子股份有限公司 | Rear polar plate type measuring microphone and manufacturing method thereof |
| CN116079499A (en) * | 2022-09-07 | 2023-05-09 | 天津大学 | Vibration measurement method and system for tool in rotary ultrasonic machining |
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