Visual sound velocity measurement intelligent experiment device

Abstract

The invention relates to the technical field of sound velocity measurement, and particularly discloses a visual sound velocity measurement intelligent experimental device, which comprises a rack, a visual sound standing wave tube is arranged on the rack, an audio loudspeaker and a reflection end cover are arranged at the two ends of the visual sound standing wave tube respectively, and an acousto-optic conversion array is arranged in the visual sound standing wave tube; an ultrasonic pipeline is further arranged on the rack, an ultrasonic transmitter is arranged at one end of the ultrasonic pipeline, and an ultrasonic receiving probe capable of linearly moving is arranged in the ultrasonic pipeline; a visual standing wave tube is used for presenting a standing wave phenomenon, and data measurement is realized, so that an experiment is more intuitive, and understanding and mastering of physical concepts in a teaching process are facilitated; a phase comparison method is used for measurement, ultrasound is spread in a pipeline, the space is closed, the influence of reflection of ultrasonic waves by surrounding objects on measurement is avoided, and measurement errors are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sound velocity measurement, and more specifically, to a visualized sound velocity measurement intelligent experimental device. Background Art

[0002] Traditional sound velocity measuring instruments used in experimental teaching mostly use ultrasonic transducers to measure the propagation speed of ultrasonic waves in the air. During the sound velocity measurement process, since the measurement space is open, ultrasonic waves are easily reflected by surrounding objects, especially desktop reflections, resulting in large errors in the measurement results. In addition, since ultrasonic waves are invisible to the naked eye, the experiments are relatively abstract, which is not conducive to the understanding and mastery of physical concepts in teaching. Summary of the invention

[0003] In order to overcome the above technical problems, the present invention proposes a visual sound velocity measurement intelligent experimental device.

[0004] The purpose of the present invention can be achieved through the following technical solutions: A visual sound velocity measurement intelligent experimental device comprises a rack; The frame is provided with a visual sound standing wave tube, both ends of which are provided with audio speakers and reflective end covers, and an acoustic-optical conversion array is provided inside the visual sound standing wave tube; An ultrasonic pipe is also arranged on the frame, an ultrasonic transmitter is arranged at one end of the ultrasonic pipe, and an ultrasonic receiving probe which can move linearly is arranged in the ultrasonic pipe.

[0005] As a further solution of the present invention: the acousto-optic conversion array is composed of a plurality of acousto-optic conversion units connected in parallel, the acousto-optic conversion unit includes an acoustic signal pickup module, and the acoustic signal pickup module includes a plurality of conversion channels with built-in pickup microphones.

[0006] As a further solution of the present invention: the rack is provided with a transmitting signal output interface and a receiving signal output interface; the transmitting signal output interface is used to selectively receive the transmitting signal of the audio speaker and the ultrasonic transmitter; the receiving signal output interface is used to selectively receive the receiving signal of the acousto-optic conversion array and the ultrasonic receiving probe.

[0007] As a further solution of the present invention: a sampling signal output interface is also provided on the rack, and the sampling signal output interface is used to receive a sampling signal.

[0008] As a further solution of the present invention: an adjustment knob is provided on the frame; In the visual standing wave method sound wave measurement mode, the adjustment knob is used to adjust the frequency and amplitude of the signal emitted by the audio speaker; In the phase comparison method sound wave measurement mode, the adjustment knob is used to adjust the sound frequency of the ultrasonic transmitter, the position of the ultrasonic receiving probe, and the amplification factor of the signal received by the ultrasonic receiving probe.

[0009] As a further solution of the present invention: an operation screen is arranged on the rack, and the operation screen is used for selecting and switching between a visual standing wave method acoustic wave measurement mode and a phase comparison method acoustic wave measurement mode.

[0010] As a further solution of the present invention: the frame is provided with a slide rail parallel to the ultrasonic pipe, a slide table is slidably mounted on the slide rail, the ultrasonic receiving probe is detachably mounted on the slide table, and the frame is also provided with a driving component for driving the slide table.

[0011] As a further solution of the present invention: the driving assembly includes a stepper motor fixed on the frame, the output end of the stepper motor is connected to a lead screw, and the lead screw is threadedly connected to the slide.

[0012] As a further solution of the present invention: a notch for accommodating the slide is provided on the ultrasonic pipe, and the notch extends in the axial direction.

[0013] As a further solution of the present invention: a limit switch adapted to the slide table is provided on one side of the frame close to the ultrasonic transmitter; When the slide triggers the limit switch, the ultrasonic receiving probe reaches the zero position.

[0014] Beneficial effects of the present invention: 1. Use a visual standing wave tube to present the standing wave phenomenon and realize data measurement, making the experiment more intuitive and conducive to the understanding and mastery of physical concepts in the teaching process; 2. Use the phase comparison method to measure. Ultrasound propagates in the pipeline. The closed space prevents the ultrasonic wave from being reflected by surrounding objects and affects the measurement, thus reducing the measurement error. 3. The operation screen and multi-function knob are used to realize human-computer interaction and control, and the output interface of the transmitting signal and the receiving signal are multiplexed, which is convenient and flexible to use and has a compact structure; 4. The stepper motor controls and drives the ultrasonic probe, making the position adjustment of the ultrasonic probe more accurate; the position of the ultrasonic probe can be adjusted manually or automatically, with a high degree of intelligence; 5. The received signal amplification factor can be adjusted manually or automatically to avoid the change of the received signal amplitude during the measurement process affecting the observation experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the front structure of the present invention; Figure 2 The schematic diagram of the structure of the present invention is a diagram in which the visual acoustic standing wave tube and the ultrasonic pipeline are removed; Figure 3 The schematic diagram of the structure of the present invention without the visualized acoustic standing wave tube, ultrasonic pipeline and operation screen; Figure 4 It is a schematic diagram of the back structure of the present invention.

[0017] In the figure: 100, rack; 101, audio speaker; 102, reflective end cap; 103, acousto-optic conversion array; 104, visual acoustic standing wave tube; 105, power socket; 106, power switch; 201, ultrasonic transmitter; 202, ultrasonic receiving probe; 203, slide rail; 204, slide table; 205, screw rod; 206, stepping motor; 207, ultrasonic pipe; 208, notch; 209, limit switch; 301, adjustment knob; 302, operation screen; 303, transmission signal output interface; 304, reception signal output interface; 305, sampling signal output interface. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0019] See also Figure 1 and Figure 2 The present invention discloses a visualized sound velocity measurement intelligent experimental device, comprising a frame 100, on which a visualized sound standing wave tube 104 is arranged, at both ends of which audio speakers 101 and reflection end covers 102 are arranged, and in which an acousto-optic conversion array 103 is arranged; an ultrasonic pipe 207 is also arranged on the frame 100, at one end of which an ultrasonic transmitter 201 is arranged, and in which a linearly movable ultrasonic receiving probe 202 is arranged; Specifically, the test device has two sound velocity measurement modes, namely, a visual standing wave method and a phase comparison method. In the two measurement modes, sound waves can propagate in corresponding pipes (i.e., the visual sound standing wave pipe 104 and the ultrasonic pipe 207), thereby avoiding interference of external factors on the sound wave measurement. In the visual standing wave method sound wave measurement mode, the audio speaker 101 emits a sound wave signal, and the sound wave propagates toward one end of the reflective end cap 102 through the visual sound standing wave tube 104. The audio signal is collected by the pickup microphone on the acousto-optic conversion array 103, and after processing, a standing wave phenomenon is presented in the visual sound standing wave tube 104, which is convenient for visual observation of the sound wave. It should be noted that the visual sound standing wave tube 104 is made of a transparent material, and the specific material may be a transparent acrylic plate, which can not only improve the effect of observing the internal sound waves, but also effectively prevent the visual sound standing wave tube 104 from being damaged by collision and scratches; In addition, the sound-light conversion array 103 is composed of several sound-light conversion units connected in parallel, and the sound-light conversion unit includes a sound signal pickup module, and the sound signal pickup module includes several conversion channels with built-in pickup microphones; the analog sound signal is converted into a digital quantity, and after being processed by the single-chip microcomputer, the luminous brightness and color of the two-color LED are controlled by the PWM signal, thereby realizing the visualization of the sound wave.

[0020] In the phase comparison method acoustic wave measurement mode, the ultrasonic receiving probe 202 is adjusted to the corresponding position, the ultrasonic transmitter 201 generates an ultrasonic signal, and the sound wave propagates toward the side of the ultrasonic receiving probe 202 through the ultrasonic pipe 207. The ultrasonic receiving probe 202 receives the ultrasonic signal. The ultrasound propagates in the pipe. The closed space prevents the ultrasound wave from being reflected by surrounding objects and affecting the measurement, thereby reducing the measurement error.

[0021] In one embodiment, see Figure 2 The rack 100 is provided with a transmission signal output interface 303 and a reception signal output interface 304; the transmission signal output interface 303 is used to selectively receive transmission signals from the audio speaker 101 and the ultrasonic transmitter 201; the reception signal output interface 304 is used to selectively receive reception signals from the acousto-optic conversion array 103 and the ultrasonic receiving probe 202; Specifically, in the visual standing wave method sound wave measurement mode, the signal transmitted by the audio speaker 101 is output from the transmission signal output interface 303, and the audio signal received by the acousto-optic conversion array 103 is output from the reception signal output interface 304; In the phase comparison method sound wave measurement mode, the transmission signal of the ultrasonic transmitter 201 is output from the transmission signal output interface 303 , and the ultrasonic signal received by the ultrasonic receiving probe 202 is output from the reception signal output interface 304 .

[0022] It should be noted that when the visualized standing wave method sound wave measurement mode is selected, the power supply of the visualized sound standing wave tube 104 is in a turned-off state, and the visualized sound standing wave tube 104 stops working.

[0023] For further information, see Figure 2The rack 100 is also provided with a sampling signal output interface 305, and the sampling signal output interface 305 is used to receive a sampling signal; In the visual standing wave method acoustic wave measurement mode, the internal sampling signal is output from the sampling signal output interface 305, and its edge signal is coupled to the receiving signal output interface 304 and output from the receiving signal output interface 304 for experimental observation; In the phase comparison acoustic wave measurement mode, the sampling signal output interface 305 stops signal output.

[0024] For further information, see Figure 2 , the frame 100 is provided with an adjustment knob 301; in the visual standing wave method sound wave measurement mode, the adjustment knob 301 is used to adjust the frequency and amplitude of the signal emitted by the audio speaker 101; in the phase comparison method sound wave measurement mode, the adjustment knob 301 is used to adjust the sound frequency of the ultrasonic transmitter 201, the position of the ultrasonic receiving probe 202 and the amplification factor of the signal received by the ultrasonic receiving probe 202.

[0025] Accordingly, see Figure 2 The rack 100 is provided with an operation screen 302, and the operation screen 302 is used for selecting and switching between a visual standing wave method acoustic wave measurement mode and a phase comparison method acoustic wave measurement mode.

[0026] In yet another embodiment, see Figure 2 and Figure 3 For adjusting the position of the ultrasonic receiving probe 202, the rack 100 is provided with a slide rail 203 which is parallel to the ultrasonic pipe 207, a slide table 204 is slidably mounted on the slide rail 203, the ultrasonic receiving probe 202 is detachably mounted on the slide table 204, and a driving component for driving the slide table 204 is also provided on the rack 100; Specifically, when it is necessary to adjust the distance between the ultrasonic receiving probe 202 and the ultrasonic transmitter 201, the slide 204 is driven by the driving component to slide along the slide rail 203, thereby driving the ultrasonic receiving probe 202 to move synchronously in the ultrasonic pipe 207, and the distance between the ultrasonic receiving probe 202 and the ultrasonic transmitter 201 can be adjusted.

[0027] Further, the specific structure of the driving assembly is not limited, and can be a cylinder or an electric cylinder, etc. In this embodiment, optionally, refer to Figure 3 The driving assembly includes a stepper motor 206 fixed on the frame 100, the output end of the stepper motor 206 is connected to a screw rod 205, and the screw rod 205 is threadedly connected to the slide 204; The stepping motor 206 drives the lead screw 205 to rotate, and the lead screw 205 and the slide table 204 drive the slide table 204 to slide along the slide rail 203, thereby realizing the position adjustment of the ultrasonic receiving probe 202.

[0028] For further information, see Figure 4 , considering that the ultrasonic receiving probe 202 is disposed inside the ultrasonic pipe 207, and the slide rail 203 is located outside the ultrasonic pipe 207, the ultrasonic pipe 207 is provided with a slot 208 for accommodating the slide 204, and the slot 208 extends in the axial direction; In this way, the end of the slide 204 away from the slide rail 203 extends into the ultrasonic pipe 207 through the slot 208. When the slide 204 slides along the slide rail 203, the slide 204 also produces relative displacement relative to the slot 208, and will not cause the slide 204 and the ultrasonic receiving probe 202 to interfere with the ultrasonic pipe 207.

[0029] It should be noted that when the phase comparison method sound wave measurement mode is used for the first time after powering on, it is necessary to perform a zeroing operation of the ultrasonic receiving probe 202 to initialize the position of the ultrasonic receiving probe 202; Accordingly, see Figure 4 A limit switch 209 adapted to the slide 204 is provided on one side of the rack 100 close to the ultrasonic transmitter 201. When the slide 204 triggers the limit switch 209, it indicates that the ultrasonic receiving probe 202 reaches the zero position; Specifically, the ultrasonic receiving probe 202 is driven by the stepper motor 206 to gradually approach the ultrasonic transmitter 201 until the slide 204 reaches the position of the limit switch 209, at which time the stepper motor 206 stops driving, the ultrasonic receiving probe 202 stops moving, and the position data of the ultrasonic receiving probe 202 returns to zero.

[0030] See also Figure 4 The rack 100 is also provided with a power socket 105 for power supply and a power switch 106 for starting and stopping.

[0031] The specific implementation methods of this embodiment are described above, but this embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms inspired by this embodiment, all of which are within the protection of this embodiment.

Claims

1. A visual sound velocity measurement intelligent experimental device, comprising a frame (100), characterized in that: A visual sound standing wave tube (104) is arranged on the frame (100), audio speakers (101) and reflective end covers (102) are arranged at two ends of the visual sound standing wave tube (104), and an acoustic-optical conversion array (103) is arranged inside the visual sound standing wave tube (104); An ultrasonic pipe (207) is also provided on the frame (100), an ultrasonic transmitter (201) is provided at one end of the ultrasonic pipe (207), and a linearly movable ultrasonic receiving probe (202) is provided inside the ultrasonic pipe (207).

2. According to claim 1, a visual sound velocity measurement intelligent experimental device is characterized in that: The acoustic-optic conversion array (103) is composed of a plurality of acoustic-optic conversion units connected in parallel, the acoustic-optic conversion units comprising an acoustic signal pickup module, and the acoustic signal pickup module comprising a plurality of conversion channels with built-in pickup microphones.

3. The visual sound velocity measurement intelligent experimental device according to claim 1 is characterized in that: The frame (100) is provided with a transmission signal output interface (303) and a reception signal output interface (304); The transmission signal output interface (303) is used to selectively receive transmission signals from the audio speaker (101) and the ultrasonic transmitter (201); The received signal output interface (304) is used to selectively receive received signals from the acousto-optic conversion array (103) and the ultrasonic receiving probe (202).

4. The visual sound velocity measurement intelligent experimental device according to claim 3 is characterized in that: The rack (100) is also provided with a sampling signal output interface (305), and the sampling signal output interface (305) is used to receive a sampling signal.

5. The visual sound velocity measurement intelligent experimental device according to claim 3 is characterized in that: The frame (100) is provided with an adjustment knob (301); In a visual standing wave method sound wave measurement mode, the adjustment knob (301) is used to adjust the frequency and amplitude of a signal emitted by the audio speaker (101); In the phase comparison method sound wave measurement mode, the adjustment knob (301) is used to adjust the sound frequency of the ultrasonic transmitter (201), the position of the ultrasonic receiving probe (202), and the amplification factor of the signal received by the ultrasonic receiving probe (202).

6. The visual sound velocity measurement intelligent experimental device according to claim 5 is characterized in that: An operating screen (302) is provided on the rack (100), and the operating screen (302) is used for selecting and switching between a visual standing wave method acoustic wave measurement mode and a phase comparison method acoustic wave measurement mode.

7. The visual sound velocity measurement intelligent experimental device according to claim 5 is characterized in that: The frame (100) is provided with a slide rail (203) distributed in parallel with the ultrasonic pipe (207); a slide table (204) is slidably mounted on the slide rail (203); the ultrasonic receiving probe (202) is detachably mounted on the slide table (204); and a driving component for driving the slide table (204) is also provided on the frame (100).

8. The visual sound velocity measurement intelligent experimental device according to claim 7 is characterized in that: The driving assembly comprises a stepper motor (206) fixed on the frame (100), the output end of the stepper motor (206) is connected to a lead screw (205), and the lead screw (205) is threadedly connected to the slide table (204).

9. The visual sound velocity measurement intelligent experimental device according to claim 8 is characterized in that: The ultrasonic pipe (207) is provided with a notch (208) for accommodating the slide table (204), and the notch (208) extends in the axial direction.

10. The visual sound velocity measurement intelligent experimental device according to claim 7, characterized in that: A limit switch (209) adapted to the slide table (204) is provided on a side of the frame (100) close to the ultrasonic transmitter (201); When the slide table (204) triggers the limit switch (209), the ultrasonic receiving probe (202) reaches the zero position.

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