Vector microphone for material surface acoustic impedance measurement

Abstract

The utility model relates to the technical field of acoustic measurement sensors, and discloses a vector microphone for material surface acoustic impedance measurement, which comprises an upper shell and a lower shell, two supports are mounted on the lower shell, sliding grooves are formed in the two supports, E-shaped rods are mounted in the sliding grooves in a sliding manner, two mounting grooves are formed in each support, and the E-shaped rods are mounted in the mounting grooves in a sliding manner. A guide rod is connected in each mounting groove, a locking block is slidably mounted on the guide rod, a first connecting rod is connected to the side wall of the locking block, a rotating shaft is connected to the first connecting rod, a second connecting rod is rotatably mounted on the rotating shaft, a sliding rod is connected to the side wall of each second connecting rod, and every two sliding rods are movably sleeved with a cross rod; a supporting rod is connected in the transverse rod, and a top block is slidably installed on the supporting rod. By adopting the L-shaped structure, the distance between the sensor and the surface of a material is ensured to be accurate, signal errors are reduced, the measurement precision is improved, the sensor is convenient to mount and dismount, maintenance and calibration are convenient, and the working efficiency and the equipment availability are improved.

Description

Technical Field

[0001] This invention belongs to the field of acoustic measurement sensor technology, specifically, it relates to a vector microphone for measuring the acoustic impedance of material surfaces. Background Technology

[0002] In the field of acoustic measurement, especially the accurate measurement of the acoustic impedance of material surfaces, has always been a crucial aspect of numerous scientific research and engineering applications. Traditional acoustic measurement equipment often has many limitations, making it difficult to meet the ever-increasing demand for high-precision and high-stability measurements.

[0003] However, traditional sensors suffer from uneven installation spacing, resulting in varying energy loss during sound wave transmission and errors in acoustic signals. They cannot accurately reflect the acoustic impedance characteristics of materials. Furthermore, the sensors are easily damaged, and the cumbersome disassembly and assembly process required by repairing, replacing, or calibrating them expends a great deal of time and effort from professionals.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] To address the problems of traditional sensors, such as uneven installation spacing leading to varying sound wave transmission energy loss, acoustic signal errors, inaccurate reflection of material acoustic impedance characteristics, sensor fragility, and the cumbersome disassembly and assembly process requiring significant time and effort from professional personnel for repair, replacement, or calibration, the basic concept of this utility model is as follows:

[0006] A vector microphone for measuring the acoustic impedance of a material surface includes an upper housing and a lower housing. Two supports are mounted on the lower housing, each supporting a housing for a sound pressure sensor and a housing for a particle velocity sensor. Each support has a sliding groove, in which an E-shaped rod is slidably mounted. Limiting rods are connected to both ends of the E-shaped rod. Each support has two mounting slots, each connected to a guide rod. A locking block is slidably mounted on the guide rod, and the locking block has a through hole. A first connecting rod is connected to the side wall of the locking block, and a rotating shaft is connected to the first connecting rod. A second connecting rod is rotatably mounted on the rotating shaft. A sliding rod is connected to the side wall of each second connecting rod, and a crossbar is movably sleeved between every two sliding rods. A support rod is connected to the crossbar, and a top block is slidably mounted on the support rod.

[0007] In a preferred embodiment of this utility model, the bottom of both the sound pressure sensor housing and the mass velocity sensor housing are provided with four pin holes, each of which is equipped with a positioning pin, and the eight positioning pins are connected to the lower housing.

[0008] In a preferred embodiment of this utility model, the upper and lower housings are provided with a plurality of sound inlets and a plurality of sound outlets, and the upper and lower housings are provided with sockets at their ends.

[0009] In a preferred embodiment of this utility model, an L-shaped circuit board is mounted on the upper housing.

[0010] In a preferred embodiment of this utility model, each of the E-shaped rods is connected to a return spring at its bottom, and the end of the return spring is connected to the bottom of the sliding groove.

[0011] In a preferred embodiment of this utility model, each of the guide rods is fitted with a spring.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] This invention employs an L-shaped structure to ensure precise distance between the sensor and the material surface, reducing signal errors and improving measurement accuracy. The sensor is easy to install and disassemble, facilitating installation, maintenance, and calibration, effectively reducing operational difficulty, and improving work efficiency and equipment availability.

[0014] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0015] In the attached diagram:

[0016] Figure 1 A three-dimensional diagram of a vector microphone used for measuring the acoustic impedance of material surfaces;

[0017] Figure 2 This is a schematic diagram of a vector microphone used for measuring the acoustic impedance of a material surface.

[0018] Figure 3 This is a partial cross-sectional view of a vector microphone used for measuring the acoustic impedance of a material surface.

[0019] Figure 4 A vector microphone for measuring the acoustic impedance of material surfaces Figure 3 Enlarged view of a portion of the image;

[0020] Figure 5 A cross-sectional view of a vector microphone used for measuring the acoustic impedance of a material surface;

[0021] Figure 6 A cross-sectional view of a locking mechanism in a vector microphone used for measuring the acoustic impedance of a material surface. Figure 1 ;

[0022] Figure 7A cross-sectional view of a locking mechanism in a vector microphone used for measuring the acoustic impedance of a material surface. Figure 2 .

[0023] In the diagram: 1. Upper housing; 2. Lower housing; 3. Sound inlet; 4. Sound outlet; 5. Socket; 6. L-shaped circuit board; 7. Positioning pin; 8. Pin hole; 9. Sound pressure sensor housing; 10. Mass velocity sensor housing; 11. Bracket; 12. Sliding groove; 13. E-shaped rod; 14. Return spring; 15. Limiting rod; 16. Mounting groove; 17. Guide rod; 18. Locking block; 19. Through hole; 20. Spring; 21. First connecting rod; 22. Rotating shaft; 23. Second connecting rod; 24. Crossbar; 25. Sliding rod; 26. Support rod; 27. Top block. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0025] like Figures 1 to 7As shown, a vector microphone for measuring the acoustic impedance of a material surface includes an upper housing 1 and a lower housing 2. Two supports 11 are mounted on the lower housing 2. A sound pressure sensor housing 9 and a particle velocity sensor housing 10 are respectively mounted on the two supports 11. Each support 11 has a sliding groove 12, in which an E-shaped rod 13 is slidably mounted. Limiting rods 15 are connected to both ends of the E-shaped rod 13. Each support 11 has two mounting slots 16. Each component is connected to a guide rod 17, and a locking block 18 is slidably mounted on the guide rod 17. The locking block 18 has a through hole 19. A first connecting rod 21 is connected to the side wall of the locking block 18. A rotating shaft 22 is connected to the first connecting rod 21. A second connecting rod 23 is rotatably mounted on the rotating shaft 22. A sliding rod 25 is connected to the side wall of each second connecting rod 23. A crossbar 24 is movably sleeved on every two sliding rods 25. A support rod 26 is connected in the crossbar 24. A top block 27 is slidably mounted on the support rod 26.In this configuration, the upper housing 1 and lower housing 2 serve as the external protective structure for the microphone, providing a basic framework for the installation of various components. The bracket 11 is the direct load-bearing component for the sound pressure sensor housing 9 and the particle velocity sensor housing 10. The sound pressure sensor housing 9 and the particle velocity sensor housing 10 are the core components protecting the internal sensors, and their precise installation position is crucial for the sensors to acquire accurate acoustic signals. The sliding groove 12 ensures the stable movement of the E-shaped rod 13. During installation, the E-shaped rod 13 supports the sound pressure sensor housing 9 and the particle velocity sensor housing... The pressing action of 10 is converted into sliding within the sliding groove 12, which in turn moves the limiting rod 15, thereby triggering the subsequent action of the locking block 18. Upon unlocking, it resets under the action of the return spring 14, returning all components to their initial state. In the initial state, the limiting rod 15 is located in the through hole 19 of the locking block 18, limiting the position of the locking block 18 and ensuring that all components are in a stable initial state when the microphone is not being installed. During installation, as the E-shaped rod 13 moves, the limiting rod 15 disengages from the through hole 19, allowing the locking block 18 to spring back. The mounting slot 16 provides the necessary conditions for locking the sensor housing. In the non-operating state, the locking block 18 is stored within the mounting slot 16. During installation, the spring 20 pushes the locking block 18 out of the mounting slot 16, allowing it to press tightly against the side wall of the sensor housing, thus achieving the locking function. The guide rod 17 precisely guides the sliding of the locking block 18. When the top block 27 presses against the sliding rod 25, the linkage mechanism moves the locking block 18 to both sides through a prying motion, thus unlocking the sensor. When the second link 23 rotates upward, it provides enough space to remove the sensor, making operation easier. When the second link 23 rotates downward, the thrust is brought closer to the locking block 18, making it easier to push the locking block back into the mounting slot 16. Under the pressure of the top block 27, the sliding rod 25 converts the pressure into a sliding motion on both sides of the crossbar 24, thereby driving the first link 21 and the second link 23 to move, thus controlling the locking block 18. The crossbar 24 provides support and a sliding track for the sliding rod 25, and the support rod 26 provides support and a sliding track for the top block 27.

[0026] like Figures 1 to 7 As shown in the specific embodiment, both the sound pressure sensor housing 9 and the particle velocity sensor housing 10 have four pin holes 8 at their bottoms, and each pin hole 8 has a positioning pin 7 installed in it. The eight positioning pins 7 are connected to the lower housing 2. In this configuration, the pin holes 8 and the positioning pins 7 ensure that the initial positions of the sound pressure sensor housing 9 and the particle velocity sensor housing 10 are accurate during the installation process.

[0027] like Figures 1 to 7As shown, furthermore, the upper housing 1 and the lower housing 2 are provided with several sound inlets 3 and several sound outlets 4, and sockets 5 are provided at the ends of the upper housing 1 and the lower housing 2. In this configuration, the sound inlets 3 can capture sound wave signals from the outside, providing an information input channel for the sensor's measurement work; while the sound outlets 4 can transmit the internally processed acoustic information in a suitable manner under specific measurement conditions; and the sockets 5 serve as a key interface for connecting the microphone to external devices, providing power to the microphone.

[0028] like Figures 1 to 7 As shown, an L-shaped circuit board 6 is mounted on the upper housing 1. In this configuration, the L-shaped circuit board 6 provides stable physical support for the internal electronic components and performs preliminary processing and optimization of the acoustic signals acquired by the sensor.

[0029] like Figures 1 to 7 As shown, each E-shaped rod 13 is connected to a return spring 14 at its bottom, and the end of the return spring 14 is connected to the bottom of the sliding groove 12. In this configuration, the return spring 14 can quickly reset the E-shaped rod 13, driving the entire mechanical structure back to its initial state.

[0030] like Figures 1 to 7 As shown, each guide rod is fitted with a spring 20. In this configuration, the spring 20 helps the locking block 18 to pop out smoothly from the mounting slot 16 and press firmly against the side wall of the sensor housing, thus achieving a reliable locking function.

[0031] The implementation principle of a vector microphone for measuring the acoustic impedance of a material surface in this embodiment is as follows: During the installation of the sound pressure sensor housing 9 and the particle velocity sensor housing 10, first, carefully align the pin holes 8 on the bottom of the housing with the positioning pins 7 one by one. Then, press the sound pressure sensor housing 9 and the particle velocity sensor housing 10 onto the bracket 11. As the pressing action proceeds, the sound pressure sensor housing 9 and the particle velocity sensor housing 10 will compress the E-shaped rod 13, causing the E-shaped rod 13 to slide within the sliding groove 12. The return spring 14 will be gradually compressed. Simultaneously... The E-shaped rod 13 drives the limiting rod 15 to move. Initially, the limiting rod 15 is located in the through hole 19 on the locking block 18. As the E-shaped rod 13 moves, the limiting rod 15 gradually disengages from the through hole 19. At this time, the spring 20 pushes the locking block 18 out of the mounting slot 16. After the locking block 18 is pushed out, it abuts against the side wall of the sensor housing, thus reliably locking the sensor housing. Considering the sensor's susceptibility to damage during use, this installation and locking mechanism not only ensures the stability of the sensor during normal operation but also... When sensor repair or replacement is required, the operation is relatively convenient. When unlocking the sensor, firstly, press the top block 27 into the crossbar 24. The top block 27 will exert a squeezing effect on the sliding rod 25. The sliding rod 25 can slide to both sides within the crossbar 24. Under the squeezing of the top block 27, the sliding rod 25 will slide to both sides of the crossbar 24. As the sliding rod 25 slides, the first connecting rod 21 and the second connecting rod 23 connected to it will be affected by the thrust and begin to spread to both sides. The first connecting rod 21 and the second connecting rod 23 form a connecting... When the first link 21 and the second link 23 are spread apart to both sides, the locking block 18 will also move to both sides under the drive of the link mechanism. At this time, the return spring 14 will use its own elastic potential energy to reset the E-shaped rod 13. During the reset process, the E-shaped rod 13 will drive the limit rod 15 to move, and finally make the limit rod 15 move back into the through hole 19 on the locking block 18, thereby locking the locking block 18. The link mechanism has two important functions: when the second link 23 rotates upward, it can make enough space to remove the sensor, making it easy to remove the sensor from the installation position.When it is necessary to push the locking block 18 back into the mounting slot 16, rotating the second connecting rod 23 downwards allows the pushing force to be closer to the locking block 18, thus making it easier and more convenient to push the locking block 18 back into the mounting slot 16 and complete the entire unlocking operation. Furthermore, the device adopts an L-shaped bottom opening sound inlet structure design. During the measurement process, the L-shaped structure allows the sound pressure sensor and the particle velocity sensor to be attached to the material surface at a precise and consistent distance. Through this close and equidistant attachment method, sound waves can be captured by the sensors more efficiently, reducing signal attenuation and interference caused by distance differences or excessive measurement spacing. When the sound wave enters the sound inlet 3, the sensor can quickly and accurately convert acoustic information such as sound pressure and particle velocity into electrical signals. The smaller measurement spacing achieved by this structure effectively avoids excessive mixing of external environmental noise, reduces measurement errors, and ensures that the entire measurement system can perform precise calculations and analyses based on accurate and reliable acoustic data, according to the established algorithms and principles, and finally output high-precision measurement results, providing solid data support for related acoustic measurement work. ;

Claims

1. A vector microphone for measuring the acoustic impedance of a material surface, comprising an upper housing (1) and a lower housing (2), characterized in that, Two brackets (11) are installed on the lower housing (2). The sound pressure sensor housing (9) and the particle velocity sensor housing (10) are respectively installed on the two brackets (11). Each of the two brackets (11) has a sliding groove (12). An E-shaped rod (13) is slidably installed in the sliding groove (12). Limiting rods (15) are connected to both ends of the E-shaped rod (13). Each bracket (11) has two mounting grooves (16). A guide rod (17) is connected to each mounting groove (16). A guide rod (17) is slidably installed on the guide rod (17). There is a locking block (18), and a through hole (19) is provided on the locking block (18). A first connecting rod (21) is connected to the side wall of the locking block (18). A rotating shaft (22) is connected to the first connecting rod (21). A second connecting rod (23) is rotatably installed on the rotating shaft (22). A sliding rod (25) is connected to the side wall of each second connecting rod (23). A crossbar (24) is movably sleeved on every two sliding rods (25). A support rod (26) is connected in the crossbar (24). A top block (27) is slidably installed on the support rod (26).

2. A vector microphone for measuring the acoustic impedance of a material surface according to claim 1, characterized in that, The bottom of both the sound pressure sensor housing (9) and the mass velocity sensor housing (10) is provided with four pin holes (8), and each pin hole (8) is equipped with a positioning pin (7). The eight positioning pins (7) are connected to the lower housing (2).

3. A vector microphone for measuring the acoustic impedance of a material surface according to claim 1, characterized in that, The upper housing (1) and the lower housing (2) are provided with a plurality of sound inlets (3) and a plurality of sound outlets (4), and the upper housing (1) and the lower housing (2) are provided with sockets (5) at their ends.

4. A vector microphone for measuring the acoustic impedance of a material surface according to claim 1, characterized in that, An L-shaped circuit board (6) is mounted on the upper housing (1).

5. A vector microphone for measuring the acoustic impedance of a material surface according to claim 1, characterized in that, Each of the E-shaped rods (13) is connected to a return spring (14) at its bottom, and the end of the return spring (14) is connected to the bottom of the sliding groove (12).

6. A vector microphone for measuring the acoustic impedance of a material surface according to claim 1, characterized in that, Each of the guide rods is fitted with a spring (20).

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