A portable impedance measuring device based on vector microphones

Abstract

The utility model relates to acoustics impedance measurement technical field discloses a kind of portable impedance measuring device based on vector microphone, including top fixed seat, base and support assembly, support assembly is connected between top fixed seat and base, support assembly includes upper support rod and lower support rod, upper support rod and lower support rod are coaxially arranged, upper support rod is rotatably connected with lower support rod, speaker is installed on top fixed seat, vector microphone is installed on base.The utility model uses detachable frame structure, upper support rod and lower support rod are rotatably matched by rotating part and rotating groove, and the quick and convenient threaded connection of two end threaded rods and fixed seat, base threaded hole is realized, adapts multiple mobile measurement scenes such as scene, only need to be placed on the surface of the measured object to complete detection, avoid the damage to the measured object, and manufacturing cost is low, through the accurate positioning of vector microphone and speaker, ensure the reliability and accuracy of measurement data.

Description

Technical Field

[0001] This utility model belongs to the field of acoustic impedance measurement technology, specifically, it relates to a portable impedance measurement device based on a vector microphone. Background Technology

[0002] Acoustic impedance measurement is a core technology for characterizing a material's ability to transmit sound waves. It is widely used in acoustic research, acoustic equipment development, noise control engineering, and building acoustic testing, among other fields. The measurement results provide crucial data support for material selection, product optimization, and noise control solution development. Existing acoustic impedance measurement equipment mainly includes impedance tubes, acoustic impedance analyzers, and microphone array-based measurement systems. These devices often rely on the collaborative operation of multiple precision sensors, signal generators, and receivers, and require specialized environments such as reflection-free test spaces and controlled temperature and humidity.

[0003] However, existing measuring equipment is bulky, heavy, and takes up a lot of space, making it difficult to meet the portability requirements of mobile scenarios such as on-site testing and field operations. The operation process is complicated, requiring professional technicians to debug, calibrate, and analyze the equipment. In addition, some of the equipment is destructive to the object being measured, and the high cost is due to the presence of many precision sensors and complex mechanical structures.

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

[0005] To address the problems of existing measuring equipment being bulky, heavy, and space-consuming, making it difficult to meet the portability requirements of mobile scenarios such as on-site inspections and field operations, having complex operation procedures requiring professional technicians for debugging, calibration, and analysis, and having some devices being destructive to the object being measured, as well as being costly due to the presence of numerous precision sensors and complex mechanical structures, the basic concept of the technical solution adopted in this utility model is as follows: A portable impedance measurement device based on a vector microphone includes a top mounting base, a base, and a support assembly. The support assembly is connected between the top mounting base and the base. The support assembly includes an upper support rod and a lower support rod, which are coaxially arranged and rotatably connected. A loudspeaker is mounted on the top mounting base, and a vector microphone is mounted on the base.

[0006] In a preferred embodiment of this utility model, four support assemblies are provided, which are symmetrically distributed in the four corner areas of the top fixing seat and the base. The upper support rod and the lower support rod are both cylindrical rod structures.

[0007] In a preferred embodiment of the present invention, one end of the upper support rod is integrally formed with a connecting part, and the other end is provided with a cylindrical rotating groove along the axial direction. One end of the lower support rod is integrally formed with a cylindrical rotating part adapted to the rotating groove, and the other end is integrally formed with a connecting part. The rotating part is embedded in the rotating groove and adapted to the rotating groove.

[0008] In a preferred embodiment of this utility model, a handle is rotatably mounted at the center of the top of the top fixing seat, and the handle is a U-shaped rod structure.

[0009] In a preferred embodiment of this utility model, a slot is provided in the middle of the lower surface of the top fixing seat along the axial direction, and a speaker is installed in the slot.

[0010] In a preferred embodiment of this utility model, the upper surface of the base is provided with a mounting groove, and a vector microphone is installed in the mounting groove.

[0011] In a preferred embodiment of this utility model, connecting holes are provided at the four corners of the top fixing seat and the four corners of the base. The connecting part is an external threaded rod structure, and the connecting hole is an internal threaded hole. The upper support rod is threadedly connected to the connecting hole of the top fixing seat through the connecting part, and the lower support rod is threadedly connected to the connecting hole of the base through the connecting part.

[0012] In a preferred embodiment of this utility model, a signal transmission line is connected to the end of the vector microphone.

[0013] Compared with the prior art, the present invention has the following advantages: This utility model adopts a detachable frame structure. The upper support rod and the lower support rod are rotated and engaged by the rotating part and the rotating groove. With the threaded rods at both ends and the threaded holes of the fixed seat and the base, a quick and convenient threaded connection is achieved. It is suitable for various mobile measurement scenarios such as on-site measurement. The structure is simple and the operation process is simplified. The device can be completed simply by gently placing it on the surface of the object to be measured, avoiding damage to the object. The device uses general standardized components, resulting in low manufacturing cost. The precise positioning of the vector microphone and the speaker ensures the reliability and accuracy of the measurement data, meeting the accuracy requirements of practical applications.

[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: Figure 1 A three-dimensional diagram of a portable impedance measurement device based on a vector microphone; Figure 2 A side view of a portable impedance measurement device based on a vector microphone; Figure 3 A cross-sectional view of a portable impedance measurement device based on a vector microphone; Figure 4 This is an exploded view of a portable impedance measurement device based on a vector microphone.

[0016] In the diagram: 1. Top mounting base; 11. Hole slot; 2. Base; 21. Mounting slot; 3. Bracket assembly; 31. Lower support rod; 32. Upper support rod; 33. Rotating part; 34. Rotating slot; 35. Connecting part; 4. Vector microphone; 41. Signal transmission line; 5. Speaker; 6. Handle; 7. Connecting hole. Detailed Implementation

[0017] 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.

[0018] like Figures 1 to 4 As shown, a portable impedance measurement device based on a vector microphone includes a top mounting base 1, a base 2, and a support assembly 3. The support assembly 3 connects the top mounting base 1 and the base 2. The support assembly 3 includes an upper support rod 32 and a lower support rod 31, which are coaxially arranged and rotatably connected. A speaker 5 is mounted on the top mounting base 1, and a vector microphone 4 is mounted on the base 2. In this configuration, the support structure between the top mounting base 1 and the base 2 is constructed through the support assembly 3. The coaxial rotation of the upper support rod 32 and the lower support rod 31 provides a foundation for the stable connection between the two ends. At the same time, it ensures that the speaker 5 and the vector microphone 4 are arranged in a vertically corresponding manner, guaranteeing the stability of the acoustic signal transmission and acquisition path.

[0019] like Figures 1 to 4 As shown, in a specific embodiment, four support components 3 are provided, which are symmetrically distributed in the four corner areas of the top fixing seat 1 and the base 2. The upper support rod 32 and the lower support rod 31 are both cylindrical rod structures. In this configuration, the four symmetrically distributed support components 3 can evenly distribute the force on the top fixing seat 1 and the base 2, thereby enhancing the stability and load-bearing capacity of the overall frame.

[0020] like Figures 1 to 4As shown, further, one end of the upper support rod 32 is integrally formed with a connecting portion 35, and the other end is provided with a cylindrical rotating groove 34 along the axial direction. One end of the lower support rod 31 is integrally formed with a cylindrical rotating portion 33 that matches the rotating groove 34, and the other end is integrally formed with a connecting portion 35. The rotating portion 33 is embedded in the rotating groove 34 and matches the rotating groove 34. In this configuration, the fitting and matching of the rotating portion 33 with the rotating groove 34 enables the coaxial rotation of the upper support rod 32 and the lower support rod 31, which facilitates the tightening of both ends of the bracket assembly 3 with the top fixing seat 1 and the base 2, respectively.

[0021] like Figures 1 to 4 As shown, a handle 6 is rotatably mounted at the center of the top of the top mounting base 1. The handle 6 has a U-shaped rod structure. In this configuration, the U-shaped handle 6 is easy to hold, and its rotatable connection with the top mounting base 1 allows for folding and storage, facilitating transfer between different measurement scenarios.

[0022] like Figures 1 to 4 As shown, furthermore, a slot 11 is formed in the middle of the lower surface of the top mounting base 1 along the axial direction, and a speaker 5 is installed in the slot 11. In this configuration, the slot 11 in the middle of the lower surface of the top mounting base 1 provides installation space for the speaker 5. The sound emission direction of the speaker 5 corresponds to the acquisition direction of the vector microphone 4 below, ensuring that the excitation sound wave can act perpendicularly on the object under test and improving the accuracy of signal acquisition.

[0023] like Figures 1 to 4 As shown, the upper surface of the base 2 is further provided with a mounting groove 21, in which a vector microphone 4 is installed. In this configuration, the mounting groove 21 provides a mounting position for the vector microphone 4.

[0024] like Figures 1 to 4 As shown, furthermore, connection holes 7 are provided at the four corners of the top fixing seat 1 and the four corners of the base 2. The connecting part 35 is an externally threaded rod structure, and the connecting hole 7 is an internally threaded hole. The upper support rod 32 is threadedly connected to the connecting hole 7 of the top fixing seat 1 through the connecting part 35, and the lower support rod 31 is threadedly connected to the connecting hole 7 of the base 2 through the connecting part 35. In this configuration, the connecting part 35 of the externally threaded rod structure and the connecting hole 7 of the internally threaded hole structure form a threaded connection, which can realize the detachable fixing of the upper support rod 32 to the top fixing seat 1 and the lower support rod 31 to the base 2. The device can be disassembled for easy storage, reducing the space occupied during carrying.

[0025] like Figures 1 to 4 As shown, the vector microphone 4 is further connected to a signal transmission line 41 at its end. In this configuration, the signal transmission line 41 stably transmits the acoustic signal acquired by the vector microphone 4 to the subsequent processing equipment, providing raw data support for the calculation of impedance values.

[0026] The implementation principle of the portable impedance measuring device based on a vector microphone in this embodiment is as follows: When the portable impedance measuring device based on a vector microphone is working, the top fixed seat 1 and the base 2 are first connected into an integral frame by four support components 3. The upper support rod 32 and the lower support rod 31 of the support components 3 are provided with connecting parts 35 at both ends. A cylindrical rotating groove 34 is opened in the upper support rod 32, and the lower support rod 31 is integrally formed with a rotating part 33 that is adapted to the rotating groove 34. The rotating part 33 is embedded in the rotating groove 34 to achieve coaxial rotation of the two, which solves the assembly problem that the threaded rods at both ends cannot be tightened with the connecting holes 7 of the top fixed seat 1 and the base 2 at the same time. During assembly, the connecting part 35 of the lower support rod 31 can be tightened and fixed with the connecting hole 7 of the base 2 first, and then the connecting part 35 of the upper support rod 32 can be tightened with the connecting hole 7 of the top fixed seat 1 by rotating the upper support rod 32 relative to the lower support rod 31. The speaker 5 on the top mounting base 1 is installed in the slot 11 to emit excitation sound waves of a specific frequency. The vector microphone 4 on the base 2 is installed in the mounting slot 21 to collect acoustic signals reflected by the object under test. In use, the speaker 5 is first connected to an external audio playback device, and the vector microphone 4 is connected to the acquisition card and PC via the signal transmission line 41. Then, the device is placed flat at the measurement position, and the program on the PC is started to make the speaker 5 emit excitation sound waves. The sound waves are collected by the vector microphone 4 after being reflected by the object under test. The collected sound pressure and particle velocity signals are transmitted to the PC via the signal transmission line 41. After processing by the software algorithm, the acoustic impedance value of the object under test can be calculated. The handle 6 on the top of the top mounting base 1 facilitates carrying and moving the device. After the measurement is completed, the bracket assembly 3, the top mounting base 1, and the base 2 can be disassembled and stored by removing the threaded connection between the connecting part 35 and the connecting hole 7, further improving portability.

Claims

1. A portable impedance measurement device based on a vector microphone, comprising a top mounting base (1), a base (2), and a support assembly (3), characterized in that, A bracket assembly (3) is connected between the top fixed seat (1) and the base (2). The bracket assembly (3) includes an upper support rod (32) and a lower support rod (31). The upper support rod (32) and the lower support rod (31) are coaxially arranged. The upper support rod (32) and the lower support rod (31) are rotatably connected. A speaker (5) is installed on the top fixed seat (1), and a vector microphone (4) is installed on the base (2).

2. The portable impedance measurement device based on a vector microphone according to claim 1, characterized in that, The bracket assembly (3) is provided in four parts. The four bracket assemblies (3) are symmetrically distributed in the four corner areas of the top fixing seat (1) and the base (2). The upper support rod (32) and the lower support rod (31) are both cylindrical rod structures.

3. A portable impedance measurement device based on a vector microphone according to claim 2, characterized in that, One end of the upper support rod (32) is integrally formed with a connecting part (35), and the other end is provided with a cylindrical rotating groove (34) along the axial direction. One end of the lower support rod (31) is integrally formed with a cylindrical rotating part (33) that is adapted to the rotating groove (34), and the other end is integrally formed with a connecting part (35). The rotating part (33) is embedded in the rotating groove (34) and is adapted to the rotating groove (34).

4. A portable impedance measurement device based on a vector microphone according to claim 3, characterized in that, The top fixing seat (1) has a handle (6) rotatably installed at the top center position. The handle (6) is a U-shaped rod structure.

5. A portable impedance measurement device based on a vector microphone according to claim 4, characterized in that, The lower surface of the top fixing seat (1) is provided with a slot (11) along the axial direction, and a speaker (5) is installed in the slot (11).

6. A portable impedance measurement device based on a vector microphone according to claim 5, characterized in that, The upper surface of the base (2) is provided with a mounting groove (21), and a vector microphone (4) is installed in the mounting groove (21).

7. A portable impedance measurement device based on a vector microphone according to claim 6, characterized in that, The top fixing seat (1) and the base (2) are provided with connecting holes (7) at the four corners. The connecting part (35) is an external thread rod structure and the connecting hole (7) is an internal thread hole. The upper support rod (32) is threadedly connected to the connecting hole (7) of the top fixing seat (1) through the connecting part (35) and the lower support rod (31) is threadedly connected to the connecting hole (7) of the base (2) through the connecting part (35).

8. A portable impedance measurement device based on a vector microphone according to claim 7, characterized in that, The vector microphone (4) is connected to a signal transmission line (41) at its end.

Images