Visual sound wave interference phenomenon demonstrator

Abstract

The utility model discloses a visual sound wave interference phenomenon demonstrator, which is characterized by comprising a transparent sound wave interference cavity, a three-way unit, a sound source controller and a sound source, wherein the transparent sound wave interference cavity is provided with the three-way unit, and the three-way unit is used for placing the sound source into the transparent sound wave interference cavity through the three-way unit; the sound source controller is used for controlling the sound source to generate a sound wave signal; the transparent sound wave interference cavity is filled with foam which is used for forming a foam wall when the sound wave signals propagate in the transparent sound wave interference cavity and interfere with each other. According to the invention, the sound intensity change in interference is ingeniously converted into the vibration and static state of the foam particles, and the visualization of the sound wave interference phenomenon is perfectly realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of acoustics, and in particular relates to a visual sound wave interference phenomenon demonstrator. Background Art

[0002] Regarding the phenomenon of sound wave interference, in previous textbooks, it was suggested that the teacher strike a tuning fork, ask students to walk around the tuning fork and observe the changes in the intensity of the sound to demonstrate the interference phenomenon of sound. The frequency of the tuning fork usually used in the laboratory is 440Hz. Calculated based on the speed of sound of 340m / s, the wavelength of the wave λ=v / f≈0.773m. The distance between the two forks (i.e., two identical wave sources) is 0.02m, which is about 0.02λ. From theoretical calculations, it can be seen that only one reinforcement zone will be formed on the perpendicular midline of the line connecting the two forks, and there is no weakening zone around the other two tuning forks. Although the frequencies of the two wave sources are the same, due to the limitation of the distance between the two forks and the small sound of the tuning fork, the experiment will not achieve the expected effect. In actual operation, there are some changes in the intensity of the sound. The reason is that the tuning fork has different amplitudes in different directions, which is not caused by interference.

[0003] Some textbooks use two loudspeakers on the playground as coherent wave sources, and use the example of loud sound in some places and soft sound in other places to illustrate the interference phenomenon of sound waves. In actual operation, the phenomenon is not obvious, and it is not easy to operate in classroom teaching, and it does not have the characteristics of visualization.

[0004] Other traditional sound wavelength measurement equipment is complex and cumbersome to operate, and is not suitable for classroom teaching in primary and secondary schools.

[0005] Therefore, at present, there is no visual sound wave interference demonstration experimental equipment in primary and secondary schools in China. The interference phenomenon of waves is only analyzed theoretically during teaching. Students lack intuitive feelings, which is not conducive to their deep understanding and mastery of knowledge. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a visual acoustic wave interference phenomenon demonstrator.

[0007] This application uses the "Frequency Sound Generator" applet on a smartphone to drive Bluetooth sound. Sound waves propagate along two paths inside the pipe. They are coherent waves with the same pace and frequency, and interference occurs in the pipe. In the vibration attenuation area, the air pressure will be different due to the different attenuation amplitudes at each point. The foam particles at the location with low pressure will protrude upward to form multiple "foam walls". They "dance" together, which looks very shocking. The changes in the intensity of the sound in the interference are cleverly converted into the vibration and stillness of the foam particles, perfectly realizing the visualization of the sound wave interference phenomenon.

[0008] According to the principle of wave interference, the distance between adjacent strengthening points or weakening points is twice the wavelength. This demonstration instrument can measure the wavelength of sound waves by measuring the center distance of adjacent "foam walls". The visual sound wave interference demonstrator is a supplement and expansion of experimental teaching in physics textbooks. It helps students further understand the interference phenomenon of sound waves.

[0009] The technical solution of this application is:

[0010] A visual acoustic interference phenomenon demonstrator, characterized in that it comprises a transparent acoustic interference cavity, a three-way unit, a sound source controller and a sound source; wherein,

[0011] The transparent acoustic wave interference cavity is provided with the three-way unit, which is used to place the sound source into the transparent acoustic wave interference cavity through the three-way unit;

[0012] The sound source controller is used to control the sound source to generate a sound wave signal;

[0013] The transparent acoustic wave interference cavity is filled with foam, which is used to form a foam wall when the acoustic wave signal propagates in the transparent acoustic wave interference cavity and interferes.

[0014] Furthermore, the transparent acoustic wave interference cavity is a cylindrical cavity formed by connecting multiple sections of transparent tubes via adapters.

[0015] Furthermore, a scale area is provided on the transparent acoustic wave interference cavity for calculating the distance between adjacent foam walls.

[0016] Furthermore, the sound source is a Bluetooth speaker; and the sound source controller is a smart phone.

[0017] The advantages of the utility model are as follows:

[0018] (1) The interference phenomenon of sound is cleverly displayed by the jumping and stillness of foam particles, realizing the visualization of the experimental phenomenon.

[0019] (2) Use the interference principle to conveniently and quickly measure the wavelength of sound waves, allowing students to experience that exploration and innovation are the source of scientific and technological progress.

[0020] (3) Use mini-programs and Bluetooth speakers on smartphones to adjust sound frequency conveniently, quickly, and accurately.

[0021] (4) The experimental phenomenon is obvious, the performance is stable, the operation is simple, and the instrument is easy to make. Students are happy to accept and understand it. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the visual acoustic wave interference phenomenon demonstrator of the present application.

[0023] Figure 2 This is a schematic diagram of the visual sound wave interference phenomenon demonstrator when interference occurs.

[0024] Among them, 1-transparent acoustic wave interference cavity, 2-foam, 3-three-way unit. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] The structure of the visual acoustic wave interference phenomenon demonstrator of this application is as follows Figure 1 As shown, it includes a transparent acoustic wave interference cavity 1, foam 2, a three-way unit 3, a sound source controller and a sound source; wherein, the transparent acoustic wave interference cavity 1 is provided with a three-way unit 3 for placing the sound source into the transparent acoustic wave interference cavity 1; and the transparent acoustic wave interference cavity 1 is filled with foam 2.

[0027] The transparent acoustic wave interference cavity 1 is a rectangular cavity frame with a length × height = 116 × 45 cm; the outer diameter of the transparent tube of the frame is 32 mm; the inner diameter of the three-way unit 3 is 40 mm. The sound source is a Bluetooth speaker (cylindrical bottom diameter × height = 35 × 25 mm, rated power 1w, response frequency 120-20KHz), and the sound source controller is a smart phone.

[0028] This application is a perfect combination of information technology and the interference principle of sound waves; the "frequency sound generator" software of the smartphone can easily obtain sinusoidal sound waves of any frequency; Bluetooth transmission to the speaker is efficient and fast; and the interference phenomenon generated in the pipeline is highly controllable.

[0029] How to use this application:

[0030] 1. Download and install "Frequency Sound Generator" on your smartphone as the sound source controller, and use the Bluetooth speaker as the sound source. Turn on the Bluetooth speaker and the Bluetooth on your phone and pair them.

[0031] 2. Place the Bluetooth speaker in the pipe from the three-way port and cover the sealing cover. Start the "frequency sound generator" and turn the adjustment knob to get the desired frequency. Figure 2 The foam wall shown. Record the scales corresponding to the two adjacent foam walls and calculate the distance d between them. According to the interference principle, we can get λ=2d.

[0032] Although the specific embodiments of the present invention are disclosed for the purpose of illustration, the purpose is to help understand the content of the present invention and implement it accordingly. Those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the attached claims. Therefore, the present invention should not be limited to the content disclosed in the best embodiment, and the scope of protection claimed by the present invention shall be based on the scope defined in the claims.

Claims

1. A visual acoustic wave interference phenomenon demonstrator, characterized in that: It includes a transparent acoustic wave interference cavity, a three-way unit, a sound source controller and a sound source; wherein, The transparent acoustic wave interference cavity is provided with the three-way unit, which is used to place the sound source into the transparent acoustic wave interference cavity through the three-way unit; The sound source controller is used to control the sound source to generate a sound wave signal; The transparent acoustic wave interference cavity is filled with foam, which is used to form a foam wall when the acoustic wave signal propagates in the transparent acoustic wave interference cavity and interferes.

2. A visual acoustic wave interference phenomenon demonstrator according to claim 1, characterized in that: The transparent acoustic wave interference cavity is a cylindrical cavity formed by connecting multiple sections of transparent tubes via adapters.

3. A visual acoustic wave interference phenomenon demonstrator according to claim 2, characterized in that: The transparent sound wave interference cavity is provided with a scale area for calculating the distance between adjacent foam walls.

4. A visual acoustic wave interference phenomenon demonstrator according to claim 1, 2 or 3, characterized in that: The sound source is a Bluetooth speaker; and the sound source controller is a smart phone.

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