Electrostatic exciter reliability testing device

Abstract

The utility model discloses a reliability testing device for an electrostatic exciter. The reliability testing device comprises an excitation signal module, a device testing module and a data acquisition and analysis module which are connected in sequence, the excitation signal module can generate and adjust the amplitude-frequency characteristic of an excitation signal, so that the output excitation signal meets the technical index data of the to-be-tested electrostatic exciter provided by a manufacturer. The device inspection module is used for adjusting the distance between the polar plate of the to-be-tested electrostatic exciter and the diaphragm of the standard capacitor microphone, so that the distance meets the technical index data of the to-be-tested electrostatic exciter provided by a manufacturer; and the data acquisition and analysis module is used for conditioning and amplifying the output signal of the device inspection module and then carrying out signal acquisition and analysis processing to judge the reliability of the electrostatic exciter device to be detected. The device can be compatible with electrostatic exciters of various models, and an accurate reliability evaluation result is obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrostatic exciter technical field, especially relates to a kind of electrostatic exciter reliability testing device. BACKGROUND

[0002] In the field of electroacoustic measurement microphone, electrostatic exciter is widely used in determining frequency response, which is of great significance to the research and development, production and quality control of acoustic products. For example, in the design and production process of automotive audio system, earphone, microphone and other products, electrostatic exciter is widely used to accurately determine and calibrate the frequency response of microphone, to ensure that the sound quality and performance of the product meet the design requirements. The performance of electrostatic exciter has a direct impact on the measurement and calibration results of microphone. In order to ensure the accuracy of the results, it is particularly important to regularly test the reliability of electrostatic exciter.

[0003] At present, there are various electrostatic exciters on the market, but the reliability test of these electrostatic exciters still has shortcomings, the detection process is complex and easy to make mistakes, and there is a lack of a standardized testing device, so that it is difficult to effectively reproduce and verify the related parameters of electrostatic exciter performance provided by the manufacturer, such as the distance between the plate and the diaphragm, the output frequency and amplitude of sound pressure level, etc. Therefore, it is impossible to judge whether the performance of electrostatic exciter is normal and whether maintenance is needed. This limitation not only reduces production efficiency, but also may lead to inconsistency of microphone measurement and calibration results, thereby affecting the reliability of acoustic measurement. Therefore, it is of great practical significance and market demand to develop an electrostatic exciter reliability testing device. SUMMARY

[0004] (I) Technical problem to be solved

[0005] Therefore, the utility model provides an electrostatic exciter reliability testing device to solve the problem that the traditional detection process of electrostatic exciter is complex and easy to make mistakes, and there is a lack of a standardized testing device, so that it is difficult to effectively reproduce and verify the related parameters of electrostatic exciter performance provided by the manufacturer.

[0006] (II) Technical scheme

[0007] In order to achieve the above purpose, the utility model provides an electrostatic exciter reliability testing device, which comprises excitation signal module, device testing module and data acquisition and analysis module connected in sequence;The device testing module comprises testing cavity, conductive shaft, insulator, four small stop needles, standard capacitor microphone and soft rubber fixing frame.

[0008] The soft rubber fixing frame is used for fixing a standard condenser microphone, the four small stop pins are used for fixing the soft rubber fixing frame, so that the four small stop pins, the standard condenser microphone and the soft rubber fixing frame are all fixed at the right end of the inner wall of the test cavity; the conductive shaft penetrates through the insulator and is connected with the polar plate of the to-be-tested electrostatic exciter; the conductive shaft, the insulator and the polar plate of the to-be-tested electrostatic exciter are all arranged at the left end of the inner wall of the test cavity, and the distance between the polar plate of the to-be-tested electrostatic exciter and the diaphragm of the standard condenser microphone can be adjusted through the insulator.

[0009] Preferably, the test cavity comprises an integrally-formed ladder-shaped lower column and a cylindrical upper column, the cross section of the ladder-shaped column is a quadrilateral, three sides of the quadrilateral are the lower base and two sides of the isosceles trapezoid, and the other side of the quadrilateral is a circular arc section of the cylindrical upper column, and the ladder-shaped lower column is used for stably supporting the cylindrical upper column; the cylindrical upper column is a hollow cylindrical structure and is used for accommodating and supporting the insulator, the four small stop pins and the soft rubber fixing frame.

[0010] Preferably, the test cavity is made of transparent hard PCB material, has a length of 100 mm, an inner diameter of 20 mm and a thickness of 5 mm.

[0011] Preferably, the test cavity has a scale mark on the surface, the scale range is 0-10 mm, and the scale accuracy is 0.5 mm.

[0012] Preferably, the conductive shaft is made of copper.

[0013] Preferably, the insulator is made of PE material and comprises a first cylinder, a second cylinder and a cone which are integrally formed and connected in sequence; the first cylinder, the second cylinder and the cone are all center-hollow structures, so that the conductive shaft penetrates through the insulator through the center holes of the first cylinder, the second cylinder and the cone; the first cylinder is used for pushing the insulator to move, and the radius of the first cylinder is not greater than the radius of the second cylinder; the radius of the second cylinder is the same as the radius of the inner wall of the test cavity, and the second cylinder is used for supporting and fixing the insulator; the cone is connected with the polar plate of the to-be-tested electrostatic exciter at the top, and does not cover the strip-shaped hole or the circular hole above the polar plate; the insulator can push the polar plate of the to-be-tested electrostatic exciter to move in the test cavity.

[0014] Preferably, the four small stop pins are fixed at 20 mm of the right end of the inner wall of the test cavity, the four small stop pins are located at the same cross section of the test cavity, and the location is the position of the scale mark of 0 on the surface of the test cavity.

[0015] Preferably, the soft rubber fixing frame is a cylindrical structure, made of elastic soft rubber, with a side thickness of 3.425mm and an inner diameter of 13.15mm.

[0016] Preferably, the excitation signal module comprises a signal generator, a signal amplifier and a filter connected in sequence; the signal generator is used to generate an excitation signal, the signal amplifier is used to amplify the excitation signal, and the filter is used to filter the amplified excitation signal, so that the excitation signal module outputs an excitation signal with stable amplitude and specific frequency.

[0017] Preferably, the data acquisition and analysis module comprises a signal conditioning unit and a data acquisition and analysis instrument connected in sequence; the signal conditioning unit is used to condition and amplify the output signal of the device testing module, and the data acquisition and analysis instrument is used to collect and analyze the conditioned and amplified output signal.

[0018] (III) Beneficial effects

[0019] The above technical scheme of the utility model has the following advantages:

[0020] The electrostatic exciter reliability testing device provided by the utility model can be compatible with various models of electrostatic excitors, so that the related parameters of the performance of the electrostatic excitors provided by manufacturers can be effectively reproduced and verified, the operation is simple, and accurate reliability performance evaluation results can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0021] The features and advantages of the utility model will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be understood as any limitation on the utility model, and in the drawings:

[0022] Figure 1 is a frame structure schematic view of the utility model embodiment;

[0023] Figure 2 is a testing module device schematic view of the utility model embodiment.

[0024] Wherein, 1-testing cavity, 2-insulator, 3-conductive shaft, 4-to-be-measured electrostatic exciter plate, 5-soft rubber fixing frame, 6-small stop needle. DETAILED DESCRIPTION

[0025] The specific implementation of the utility model will be further described in detail in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0026] The frame structure schematic view of the electrostatic exciter reliability testing device provided by the utility model embodiment is as shown in Figure 1As shown, the device inspection module includes an inspection cavity 1, an insulator 2, a conductive shaft 3, four small blocking needles 6, a standard condenser microphone, and a soft rubber fixing bracket 5.

[0027] The excitation signal module includes a signal generator, a signal amplifier, and a filter connected in sequence; the signal generator is used to generate an excitation signal, the signal amplifier amplifies the excitation signal, and the filter filters the amplified excitation signal, thereby obtaining a stable and specific amplitude frequency excitation signal. The excitation signal module can generate and adjust the amplitude frequency characteristics of the excitation signal, so that the output excitation signal meets the technical index data of the static exciter provided by the manufacturer.

[0028] As shown in Figure 2 The device inspection module includes an inspection cavity 1, an insulator 2, a conductive shaft 3, four small blocking needles 6, a standard condenser microphone, and a soft rubber fixing bracket 5.

[0029] The soft rubber fixing bracket 5 is used to fix the standard condenser microphone, and the four small blocking needles 6 are used to fix the soft rubber fixing bracket 5, so that the four small blocking needles, the standard condenser microphone, and the soft rubber fixing bracket are all fixed on the right end of the inner wall of the inspection cavity 1.

[0030] The conductive shaft 3 penetrates the insulator 2 and connects the plate 4 of the static exciter to be tested, and the conductive shaft, the insulator, and the plate of the static exciter to be tested are all placed on the left end of the inner wall of the inspection cavity 1, and the distance between the plate 4 of the static exciter to be tested and the diaphragm of the standard condenser microphone can be adjusted through the insulator 2.

[0031] In this embodiment, the inspection cavity 1 includes an integrally formed trapezoidal column lower seat and a cylindrical column upper seat. The cross section of the trapezoidal column is a quadrilateral, three sides of which are the lower base and two sides of an isosceles trapezoid, and the other side is a circular arc of the cross section of the cylindrical column upper seat. The trapezoidal column lower seat is used to stably support the cylindrical column upper seat. The cylindrical column upper seat is a hollow cylindrical structure for accommodating and supporting the insulator 2, the four small blocking needles 6, and the soft rubber fixing bracket 5. The inspection cavity is made of transparent hard PCB material. The length of the inspection cavity is 100 mm, the inner diameter is 20 mm, and the thickness is 5 mm. The surface of the inspection cavity has a scale mark with a scale range of 0-10 mm and a scale accuracy of 0.5 mm. The scale mark is used to measure the distance between the plate of the static exciter to be tested and the diaphragm of the standard condenser microphone. The inspection cavity 1 serves as a support for the insulator 2, the static exciter to be tested, the four small blocking needles 6, and the soft rubber fixing bracket 5, and provides a suitable test environment for the static exciter to be tested to generate electrostatic force on the diaphragm of the standard condenser microphone.

[0032] The conductive shaft 3 is made of copper, one end of which penetrates the handle to connect the excitation signal output by the excitation signal module, and the other end penetrates the insulator to transmit the excitation signal to the plate of the static exciter to be tested.

[0033] The insulator 2 is made of PE material, and comprises a first cylinder, a second cylinder and a cone which are integrally formed and connected in sequence; the first cylinder, the second cylinder and the cone are all center-hollow structures, and the center holes are used for penetrating the conductive shaft; the first cylinder is used for pushing the insulator to move, and the radius thereof is not greater than that of the second cylinder; the radius of the second cylinder is the same as that of the inner wall of the test cavity, and is used for supporting and fixing the insulator; the vertex of the cone is connected with the polar plate of the electrostatic exciter, and does not cover the strip-shaped hole or the circular hole above the polar plate; the insulator can push the polar plate of the electrostatic exciter to move in the test cavity, so as to change the distance between the polar plate of the electrostatic exciter and the diaphragm of the standard condenser microphone;

[0034] Four small stop pins 6 are fixed at 20 mm of the right end of the inner wall of the test cavity 1, the four small stop pins are located at the same section of the test cavity, and the positions are the positions where the scale marks on the surface of the test cavity are 0, and the function is to fix the position of the soft rubber fixing frame;

[0035] The soft rubber fixing frame 5 is a cylindrical structure, and is made of soft rubber with elasticity, the thickness of the side surface is 3.425 mm, and the inner diameter is 13.15 mm; the inner diameter of the soft rubber fixing frame is slightly smaller than the diameter of a general microphone, and the function is to fix the diaphragm of the standard condenser microphone at the position where the scale marks on the surface of the test cavity are 0, so as to prevent the standard condenser microphone from moving during the test and affecting the test result.

[0036] The data acquisition and analysis module comprises a signal conditioning unit and a data acquisition and analysis instrument which are connected in sequence; the signal conditioning unit conditions and amplifies the output signal of the device test module, and the data acquisition and analysis instrument collects and analyzes the conditioned and amplified output signal.

[0037] The working principle of the electrostatic exciter reliability test device is as follows: according to the technical index data of the electrostatic exciter provided by the manufacturer, the related parameters (the distance between the excitation signal, the polar plate of the electrostatic exciter and the diaphragm of the microphone) are reproduced, the difference between the frequency response result of the standard condenser microphone (i.e. the condenser microphone meeting the factory standard) and the preset standard provided by the manufacturer is analyzed, and the performance of the electrostatic exciter is determined.

[0038] In the embodiment, the technical index data of the electrostatic exciter to be tested are as follows: the distance between the polar plate of the electrostatic exciter and the diaphragm of the microphone is 0.5 mm, and the excitation signal required to provide a standard 94 dB sound pressure level is a sine wave signal with an output voltage of 500 mV and a frequency of 1000 Hz.

[0039] The working procedure of the electrostatic exciter reliability testing device for testing the to-be-tested electrostatic exciter is as follows: firstly, the distance between the pole plate of the to-be-tested electrostatic exciter and the diaphragm of the standard condenser microphone in the device testing module is set to the same parameter (0.5mm) as the factory data; then the excitation signal module is set to generate the same excitation signal (a sine wave signal with a voltage of 500mV and a frequency of 1000Hz) as the factory parameter data, the excitation signal is transmitted to the pole plate of the to-be-tested electrostatic exciter through the copper conductor in the insulator; the electrostatic force simulating the sound pressure acts between the pole plate of the electrostatic exciter and the diaphragm of the standard condenser microphone, the standard condenser microphone converts the electrostatic force into an electric signal and outputs the electric signal; then the signal conditioning unit of the data acquisition and analysis module conditions and amplifies the output signal of the standard condenser microphone, and the data acquisition and analysis instrument collects and analyzes the signal. Finally, the reliability degree of the to-be-tested electrostatic exciter device is judged according to the data of the data acquisition and analysis instrument.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the embodiments of the present application are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A reliability testing device for an electrostatic exciter, characterized in that, It includes an excitation signal module, a device inspection module, and a data acquisition and analysis module connected in sequence; the device inspection module includes an inspection chamber, a conductive shaft, an insulator, four small stop pins, a standard capacitor microphone, and a soft rubber mounting bracket; The soft rubber bracket is used to fix the standard condenser microphone, and the four small retaining pins are used to fix the soft rubber bracket, so that the four small retaining pins, the standard condenser microphone, and the soft rubber bracket are all fixed to the right end of the inner wall of the test chamber; the conductive shaft passes through the insulator and connects to the electrode plate of the electrostatic exciter under test; the conductive shaft, the insulator, and the electrode plate of the electrostatic exciter under test are all located at the left end of the inner wall of the test chamber, and the distance between the electrode plate of the electrostatic exciter under test and the diaphragm of the standard condenser microphone can be adjusted through the insulator.

2. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The inspection chamber includes an integrally formed trapezoidal column lower seat and a cylindrical column upper seat. The trapezoidal column has a quadrilateral cross-section, with three sides being the lower base and two lateral sides of an isosceles trapezoid, and the other side being an arc segment of the cross-section of the cylindrical column upper seat. The trapezoidal column lower seat is used to stably support the cylindrical column upper seat. The cylindrical column upper seat is a hollow cylindrical structure used to accommodate and support the insulator, four small stop pins, and a soft rubber fixing bracket.

3. The electrostatic exciter reliability testing device according to claim 2, characterized in that, The inspection chamber is made of transparent rigid PCB material, with a length of 100mm, an inner diameter of 20mm, and a thickness of 5mm.

4. As described in claim 3, characterized in that, The surface of the test chamber has graduation markings with a range of 0-10 mm and a graduation accuracy of 0.5 mm.

5. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The conductive shaft is made of copper.

6. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The insulator is made of PE material and includes a first cylinder, a second cylinder, and a cone integrally formed and connected in sequence. The first cylinder, the second cylinder, and the cone all have a centrally located hole, allowing the conductive shaft to pass through the insulator via the holes in the centers of the first cylinder, the second cylinder, and the cone. The first cylinder is used to move the insulator, and its radius is no greater than the radius of the second cylinder. The radius of the second cylinder is the same as the radius of the inner wall of the test chamber, used to support and fix the insulator. The apex of the cone connects to the electrode plate of the electrostatic exciter under test and does not cover the strip-shaped or circular hole on the electrode plate. The insulator allows the electrode plate of the electrostatic exciter under test to be moved within the test chamber.

7. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The four small stop pins are fixed 20mm from the right end of the inner wall of the inspection chamber. The four small stop pins are located on the same cross section of the inspection chamber and are positioned at the 0 mark on the surface of the inspection chamber.

8. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The soft rubber bracket is a cylindrical structure made of elastic soft rubber, with a side thickness of 3.425mm and an inner diameter of 13.15mm.

9. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The excitation signal module includes a signal generator, a signal amplifier, and a filter connected in sequence; the signal generator is used to generate an excitation signal, the signal amplifier is used to amplify the excitation signal, and the filter is used to filter the amplified excitation signal so that the excitation signal module outputs a stable excitation signal with a specific amplitude and frequency.

10. The electrostatic exciter reliability testing device according to claim 1, characterized in that, The data acquisition and analysis module includes a signal conditioning unit and a data acquisition and analysis instrument connected in sequence; the signal conditioning unit is used to condition and amplify the output signal of the device testing module, and the data acquisition and analysis instrument is used to acquire and analyze the conditionated and amplified output signal.

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