KR102188393B1 - Doppler effect experimental device of sound - Google Patents

Abstract

The present invention relates to a Doppler effect experimental device of sound and, more specifically, to a Doppler effect experimental device of sound, which is suitable for learning the principles and theories to observe the Doppler effect of sound, measure the shifted frequency, check the proportional relationship between the speed of the ultrasonic sound source and the frequency change, and measure the speed of sound in the air. The present invention for achieving the above technical object provides a Doppler effect experimental device of sound, comprising: a Trek main body provided with a fixed base to which an ultrasonic receiver is fixedly coupled, a moving block which is fixedly coupled to an ultrasonic transmitter and moves in a left and right direction by a moving means, and a start sensor and an end sensor which detects the start and end movements of the moving block; the ultrasonic transmitter detachably coupled to the moving block to generate ultrasonic waves; the ultrasonic receiver detachably coupled to the fixed base to receive the ultrasonic waves generated by the ultrasonic transmitter; a CPU composed of a waveform shaping unit for amplifying the low ultrasound signal received by the ultrasound receiver and shaping the signal into a square wave; a frequency information measuring unit for receiving the frequency signal transmitted from the waveform shaping unit in real time and measuring a frequency value that changes by time depending on the moving speed of the ultrasonic transmitter moving a certain section in the left and right direction, and a memory unit for storing frequency information measured by the frequency information measuring unit; a display unit for displaying the frequency information stored in the memory unit; and an operation unit for adjusting the horizontal movement direction and moving speed of the moving block and initializing the frequency information stored in the memory unit.

Description

Doppler effect experimental device of sound

The present invention relates to an apparatus for experimenting with the Doppler effect of sound, and more particularly, to observe the Doppler effect of sound, measure a shifted frequency, check the proportional relationship between the speed and frequency change of an ultrasonic sound source, and sound in air. It relates to a sound Doppler effect experimental apparatus suitable for use in learning the principles and theories that can measure the speed of

In the device industry using sound or sound waves, there is often a need to measure moving objects. A common environment in which the need to measure the speed of an object arises is found in toy car play sets. Historically, instruments such as plural spaced apart switches or infrared or ultrasonic detectors have been used for this purpose. This basic mechanism works by measuring the time interval between when the moving toy vehicle encounters the first and second sensors or switches.

Such instruments have achieved commercial success in a number of applications, but nevertheless, there is a continuing need in the art for a more inexpensive, more sophisticated speed measuring instrument that is suitable for use in laboratory equipment.

Korean Patent Registration No. 10-094498 has been registered.

The present invention was conceived to solve the problems of the prior art as described above, and an object of the technical configuration of the present invention is to observe the Doppler effect of sound, measure the shifted frequency, and change the speed and frequency of the ultrasonic sound source. The purpose of this study is to provide a sound Doppler effect experimental device suitable for use in learning the principles and theories that can check the proportional relationship and measure the speed of sound in the air.

The present invention for achieving the above technical problem is a fixed base to which an ultrasonic receiver is fixedly coupled, an ultrasonic transmitter is fixedly coupled, a moving block moving in the left and right direction by a moving means, and detecting the start and end motion of the moving block. Trek body provided with a start sensor and an end sensor; An ultrasonic transmitter that is detachably coupled to the moving block to generate ultrasonic waves; An ultrasonic receiver that is detachably coupled to the fixing table to receive ultrasonic waves generated by the ultrasonic transmitter; A waveform shaping unit that amplifies the signal of low ultrasonic waves received by the ultrasonic receiver to shape it into a square wave, and a frequency signal transmitted from the waveform shaping unit in real time and moves a certain section in the left and right direction according to the moving speed A CPU including a frequency information measuring unit that measures a frequency value that changes according to time, and a memory unit that stores frequency information measured by the frequency information measuring unit; A display unit that displays frequency information stored in the memory unit; And a manipulation unit for adjusting the left and right movement direction and movement speed of the moving block and initializing frequency information stored in the memory unit.

Further, the frequency information measuring unit includes: a start detection unit for starting time measurement by receiving a detection signal from the start sensor as the moving block in a stopped state moves and contacts the start sensor; An end detection unit for terminating time measurement by receiving a detection signal from the end sensor as the moving block in motion contacts the end sensor; A time measuring unit for measuring a moving time in seconds during the moving distance from the start sensor to the end sensor of the moving block; A frequency measurement unit that measures a frequency amplitude that changes for each time period measured by the time measurement unit; And an initialization unit for resetting the time recording and frequency recording measured by the time measurement unit and the frequency measurement unit.

In addition, the CPU detects the position of the moving block and blocks the motor of the moving means from continuously rotating while the moving block is located at the left or right end of the trek main body so that movement to the left or right direction is no longer possible. It characterized in that it includes a sensor position detection unit.

In addition, the moving means is provided in the center of the upper end of the trek body guide rail to guide the movement of the moving block; First and second guide pulleys provided at both ends of the guide rail to guide the rotation of the rotation line; A rotation pulley provided under any one of the first and second guide pulleys and coupled to the rotation shaft of the motor to rotate; A motor that is axially coupled to the rotary pulley to rotate the rotary pulley in a left and right direction; And a rotation line that penetrates through the through hole formed at the lower end of the movement block, and is wound around the outside of the first and second guide pulleys and the rotation pulley and rotates together in the rotation direction of the motor to move the movement block. do.

Further, the operation unit may include a movement direction button including a left button for moving the movement block in a left direction and a right button for moving the movement block in a right direction; A stop button for stopping the moving block; A moving speed control volume for adjusting a moving speed of the moving block; A scroll button including an upper button and a lower button for scrolling the information displayed on the display unit in a vertical direction; And a reset button for initializing the frequency information stored in the memory unit.

According to the present invention, it is possible to observe the Doppler effect of sound, measure the shifted frequency, check the proportional relationship between the speed of the ultrasonic sound source and the frequency change, and measure the speed of sound in the air.

In addition, it is possible to measure the changed frequency by moving the ultrasonic transmitter (sound source) that generates ultrasonic waves while the ultrasonic receiver (observer) that receives ultrasonic waves is fixed with one device, as well as the ultrasonic transmitter that generates ultrasonic waves (sound source). The changed frequency can be measured by moving the ultrasonic receiver (observer) that receives the ultrasonic waves while the is fixed.

1 is a perspective view showing a sound Doppler effect experiment apparatus according to the present invention.
Figure 2 is a perspective view showing a state in which the moving block is moved in the left direction in the state of Figure 1;
Figure 3 is a cross-sectional view showing the internal structure of Figure 2;
Figure 4 is a view for explaining the coupling relationship of the moving block, ultrasonic transmitter, and ultrasonic receiver applied to the present invention.
5 is a block diagram showing a CPU applied to the present invention
6 is a block diagram showing a frequency information measuring unit applied to the present invention
Figure 7 is a view for explaining the moving means applied to the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in the detailed description.

However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals have been used for similar elements.

Terms including ordinal numbers, such as second and first, may be used to describe various elements, but the elements are not limited by the terms.

Terms used in the present specification are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a second component may be referred to as a first component, and similarly, a first component may be referred to as a second component. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing a sound Doppler effect experiment apparatus according to the present invention, FIG. 2 is a perspective view showing a state in which the moving block is moved to the left in the state of FIG. 1, and FIG. 3 is a view showing the internal structure of FIG. It is a cross-sectional view, and FIG. 4 is a diagram for explaining a coupling relationship between a moving block, an ultrasonic transmitter, and an ultrasonic receiver applied to the present invention, and FIG. 5 is a block diagram showing a CPU applied to the present invention, and FIG. 6 is a frequency applied to the present invention. It is a block diagram showing an information measuring unit, and FIG. 7 is a view for explaining a moving means applied to the present invention.

An apparatus for experimenting with the Doppler effect of sound according to the present invention will be described with reference to FIGS. 1 to 7.

First, the present invention observes the Doppler effect of sound, measures the shifted frequency, checks the proportional relationship between the speed of the ultrasonic sound source and the frequency change, and measures the speed of sound in the air. It relates to a sound Doppler effect experimental apparatus suitable for use as a device, and such a sound Doppler effect experimental apparatus is largely a Trek main body 100, an ultrasonic transmitter 200, an ultrasonic receiver 300, a CPU 400, and a display part. It is configured to include 500 and the operation unit 600.

The trek main body 100 is formed in a rectangular box shape to achieve an overall appearance, and a power switch 110 for turning on/off the power of the system is provided at the rear end.

In addition, at both ends of the trek main body 100, the ultrasonic receiver 200, which will be described later, is detachably coupled, and a fixture 120 that can be used by connecting one or more trek main bodies 100 to each other is provided.

At this time, a first bolt hole 121 to which a bolt for fixing the ultrasonic receiver 200 is fastened is formed at the upper end of the fixing table 120, and bolting the fixing table 120 and the fixing table 120 to each other on the side surface. A second bolt hole 122 for is formed.

In addition, a moving block 130 is provided at the upper end of the trep main body 100 to slide left and right along the longitudinal direction by a moving means 700 to be described later.

The moving block 130 has a plurality of third bolt holes 131 through which a bolt for coupling a selected one of the ultrasonic transmitter 200 or the ultrasonic receiver 200 is inserted in the center, and a plurality of third bolt holes 131 are formed in the center of the lower end. A through hole 132 through which the rotation line 760 of the moving means 700 to be described later passes is formed, and at the bottom of the edge of one end, a contact surface portion that is in surface contact with the upper surface of the start sensor 140 and the end sensor 150 133 is formed.

In addition, a pair of rail insertion grooves 134 inserted into both ends of the guide rail 710 are formed at the lower end of the moving block 130.

The moving means 700 is provided at the center of the upper end of the trek main body 100 to guide the movement of the moving block 130, and the guide rail 710 is provided at both ends of the guide rail 710, It is provided under any one of the first and second guide pulleys 720 and 730 to guide rotation and the first and second guide pulleys 720 and 730 to rotate by being coupled to the rotation shaft of the motor 750 It penetrates through the through hole 132 formed at the lower end of the moving block 130 and the motor 750 which is axially coupled with the rotary pulley 740 to rotate the rotary pulley 740 in the left and right direction, , The first and second guide pulleys 720 and 730 and the rotation pulley 740 are wound on the outer side and rotated together in the rotational direction of the motor 750 and include a rotation line 760 for moving the moving block 130 It is composed by

In addition, a start sensor 140 for detecting the starting motion of the moving block 130 is provided on one side of the upper end of the trep body 100, and an end sensor 150 for detecting the end motion of the moving block 130 is provided on the other side. It is equipped.

At this time, the start sensor 140 and the end sensor 150 are configured to be pushed downward when an external force is applied by contacting the lower end of the moving block 130 to be moved and elastically restored when the contact is released. 140) transmits a detection signal to the start detection unit 421, which will be described later, when it comes into contact with the movement block 130, and the end sensor 150 transmits a detection signal to the end detection unit 422, which will be described later when contact with the movement block 130 Send.

Meanwhile, in the start sensor 140 and the end sensor 150, the end sensor 150 plays the role of the start sensor or the start sensor 140 plays the role of the end sensor 150 according to the moving block 130 moving start position. Perform. That is, when the movement block 130 is located at the left end of the trek body 100 and moves to the right, the end sensor 150 serves as the start sensor, and the start sensor 140 serves as the end sensor. Is to do.

The ultrasonic transmitter 200 is detachably coupled to the moving block 130 to continuously generate ultrasonic waves.

In addition, the ultrasonic transmitter 200 has a fourth bolt hole 210 for coupling the bolt corresponding to the third bolt hole 131 formed in the moving block 130.

In addition, the ultrasonic receiver 300 is detachably coupled to the fixing table 120 to receive ultrasonic waves continuously generated by the ultrasonic transmitter 200.

In addition, the ultrasonic receiving unit 300 has a fifth bolt hole 310 for coupling the bolt corresponding to the first bolt hole 121 formed in the fixing table 120.

Meanwhile, the ultrasonic transmitter 200 is coupled to the moving block 130, and the ultrasonic receiver 300 is coupled to the fixed base 120 to move the ultrasonic transmitter 200 in the left and right directions from the trek body 100 to measure the frequency. The ultrasonic receiver 200 is coupled to the fixed base 120, and the ultrasonic receiver 300 is coupled to the moving block 130, but the ultrasonic receiver 300 is connected to the trek main body 100. You can also measure the frequency by moving left or right at.

The CPU 400 amplifies the signal of low ultrasonic waves received by the ultrasonic receiver 300 to form a square wave, and a frequency signal transmitted from the waveform shaping unit 410 is received in real time to A frequency information measuring unit 420 that measures a frequency value that changes over time according to the moving speed of the ultrasonic transmitter 200 moving in a certain direction in the direction, and the frequency information measured by the frequency information measuring unit 420 is stored. It is configured to include a memory unit 430.

The frequency information measurement unit 420 starts to start time measurement by receiving a detection signal from the start sensor 140 as the moving block 130 in a stopped state moves and contacts the start sensor 140 to apply an external force. The detection unit 421 and the end detection unit 422 for terminating time measurement by receiving a detection signal from the end sensor 150 as the moving block 130 in motion contacts the end sensor 150 and applies an external force. Wow, a time measurement unit 423 for measuring the movement time in seconds during the movement distance from the start sensor 140 to the end sensor 150 by the movement block 130, and the time measurement unit ( A frequency measurement unit 424 that measures the magnitude of the frequency changed for each time period measured at 423 is included.

Meanwhile, the time measurement unit 423 measures time in units of 1/10000 seconds.

In addition, the frequency information measuring unit 420 may further include a time measuring unit 423 and an initialization unit 425 for resetting the time recording and frequency recording measured by the frequency measuring unit 424.

In addition, the CPU 400 detects the position of the movement block 130 and the movement block 130 is located at the upper left or right end of the trek main body 100 so that movement to the left or right direction is no longer possible. A sensor position detection unit 440 that blocks the motor 750 of the moving means 700 from continuously rotating is further included.

For example, if the moving block 130 is located at the left end of the trek main body 100 while the power of the trek main body 100 is turned off, the motor 750 rotates to the left for 1 second when the power is turned on. The moving block 130 is moved to the left. At this time, if the moving block 130 is not detected by the end sensor 150, the motor 750 is rotated to the right for 1 second to move the moving block 130 to the right. When the sensor 150 detects that the moving block 130 is located on the left, the motor 750 is rotated to the left for 1 second to move the moving block 130 to the left to stop. Then, when moving the moving block 130 in the stopped state, only the right button 612 of the moving direction button 610 is operated.

In addition, when the movement block 130 is located at the right end of the trek main body 100 while the power of the trek main body 100 is turned off, the motor 750 is rotated to the left for 1 second when the power is turned on. The moving block 130 is moved to the left, and at this time, when the start sensor 140 is detected, it senses that the moving block 130 is located on the right and rotates the motor 750 to the right for 1 second to turn the moving block 130 to the right. Move and stop. Then, when moving the moving block 130 in the stopped state, only the left button 611 of the moving direction button 610 is operated.

In addition, when the power of the trek main body 100 is turned off and the moving block 130 is located in the center of the trek main body 100, when the power is turned on, the motor 750 is rotated to the left for 1 second and the moving block ( 130) is moved to the left. At this time, if the end sensor 150 is not detected, the motor 750 is rotated to the right to move the moving block 130 to the right until the start sensor 140 is detected. When the start sensor 140 is detected, the motor 750 is rotated to the right for 1 second to move the moving block 130 to the right to stop.

That is, the sensor position detection unit 440 detects the current position of the moving block 130 according to the detection signals of the start sensor 140 and the end sensor 150 and moves while the moving block 130 is no longer able to move. As the motor 750 continuously rotates as the direction button 610 is pressed, the rotation line 760 is strained to prevent a failure.

When the time measurement is started by the start detection unit 421, the display 500 displays START, and when the time measurement is finished by the end detection unit 422, an END display and the total frequency movement time are displayed. A frequency that is provided with the first display window 510 and changes by unit time during the moving distance from the start sensor 140 to the end sensor 150 or the end sensor 150 to the start sensor 140 of the moving block 130 A second display window 520 displaying the size is provided.

The operation unit 600 includes a left button 611 for moving the above-described moving block 130 in the left direction, and a right button 612 for moving the moving block 130 in the right direction. And, a stop button 620 that can temporarily stop the moving block 130 moving in the left and right direction, a moving speed control volume 630 that adjusts the moving speed of the moving block 130, and a display unit 500 Includes a scroll button 640 including an upper button 641 and a lower button 642 for scrolling the information displayed in the vertical direction, and a reset button 650 for initializing the frequency information stored in the memory unit 430 It is composed by

Hereinafter, an experiment method of the sound Doppler effect experiment apparatus 10 configured as described above will be described.

Prior to the description, as an experiment method, the case where the ultrasonic transmitter moves and the ultrasonic receiver is stopped, or the ultrasonic receiver moves and the ultrasonic transmitter is stopped can be selectively tested.

First, explaining the case where the ultrasonic transmitter moves and the ultrasonic receiver is stopped, the ultrasonic receiver 300 is fixedly coupled to the fixing table 120 provided on the left side of the trek main body 100, and the ultrasonic receiver 300 is fixed to the moving block 130. The transmission unit 200 is fixedly coupled.

Then, after turning on the power switch 110 of the trek main body 100, position the moving block 130 at the right end of the trek main body 100, and then move the ultrasonic transmitter 200 to the left (ultrasonic wave To measure the frequency of the transmitter 200 when it is close to the ultrasonic receiver 300), press the reset button 650 to initialize the timer and the frequency counter, and press the left button 611 of the operation unit 600 to move the block. Move (130) to the left.

Then, as the movement block 130 starts and comes into contact with the start sensor 140, time measurement starts and a START is displayed on the display unit 500, and when the movement block 130 reaches the left end As the time measurement is terminated as the end sensor 150 is contacted, an END is displayed on the display unit 500 at the same time. During the total moving distance from the start sensor 140 to the end sensor 150, the time is changed by time in seconds. It displays the frequency.

Accordingly, the frequency recorded in the display unit 500 in seconds (0.5 seconds) is scrolled up and down by pressing the upper button 641 and the lower button 642 of the operation unit 600 to visually check the frequency information.

And the reset button 650 to measure the frequency when the moving block 130 located at the left end of the trek main body 100 is moved in the right direction (when the ultrasonic receiver 300 and the ultrasonic transmitter 200 move away). Press to initialize the measurement record, and press the right button 612 of the operation unit 600 to move the moving block 130 to the right.

Then, as the moving block 130 starts and comes into contact with the end sensor 150, time measurement starts and a START is displayed on the display unit 500, and when the moving block 130 reaches the right end As the time measurement is terminated as the start sensor 140 comes into contact, an END is displayed on the display unit 500, and changes by time in seconds during the total moving distance from the end sensor 150 to the start sensor 140 By displaying the frequency, the measured record can be checked with the naked eye of the experimenter.

Finally, the above-described process is repeated while recording the speed step of the moving block 130 by using the moving speed control volume 630 of the operation unit 600.

And when testing the case where the ultrasonic receiver 300 moves and the ultrasonic transmitter 200 is stationary, the ultrasonic transmitter 200 is fixedly coupled to the fixture 120 provided on the left side of the trek body 100, and the moving block The ultrasonic receiver 200 is fixedly coupled to the 130.

Then, after turning on the power switch 110 of the trek main body 100, the position of the moving block 130 is positioned at the right end of the trek main body 100, and then the ultrasonic receiver 300 is moved in the left direction (ultrasonic wave In order to measure the frequency of the receiving unit 300 when it is close to the ultrasonic transmitter 200), press the reset button 650 to initialize the timer and the frequency counter, and press the left button 611 of the operation unit 600 to move the block Move (130) to the left.

Then, as the movement block 130 starts and comes into contact with the start sensor 140, time measurement starts and a START is displayed on the display unit 500, and when the movement block 130 reaches the left end As the time measurement is terminated as the end sensor 150 is contacted, an END is displayed on the display unit 500 at the same time. During the total moving distance from the start sensor 140 to the end sensor 150, the time is changed by time in seconds. It displays the frequency.

Accordingly, the frequency recorded in the display unit 500 in seconds (0.5 seconds) is scrolled up and down by pressing the upper button 641 and the lower button 642 of the operation unit 600 to visually check the frequency information.

And the reset button 650 to measure the frequency when the moving block 130 located at the left end of the trek body 100 is moved in the right direction (when the ultrasonic transmitter 200 and the ultrasonic receiver 300 move away). Press to initialize the measurement record, and press the right button 612 of the operation unit 600 to move the moving block 130 to the right.

Then, as the moving block 130 starts and comes into contact with the end sensor 150, time measurement starts and a START is displayed on the display unit 500, and when the moving block 130 reaches the right end As the time measurement is terminated as the start sensor 140 comes into contact, an END is displayed on the display unit 500, and changes by time in seconds during the total moving distance from the end sensor 150 to the start sensor 140 By displaying the frequency, the measured record can be checked with the naked eye of the experimenter.

Finally, the above-described process is repeated while recording the speed step of the moving block 130 by using the moving speed control volume 630 of the operation unit 600.

10: sound Doppler effect experimental device
100: Trek body
110: power switch
120: fixture 121: first bolt ball 122: second bolt ball
130: moving block 131: third bolt hole 132: through hole 133: contact surface portion
134: rail insertion groove
140: start sensor
150: end sensor
200: ultrasonic transmitter
210: 4th bolt ball
300: ultrasonic receiver
310: 5th bolt ball
400: CPU
410: waveform shaping unit
420: frequency information measurement unit 421: start detection unit 422: end detection unit
423: time measurement unit 424: frequency measurement unit 425: initialization unit
430: memory unit
440: sensor position detection unit
500: display
510: first display window
520: second display window
600: control panel
610: movement direction button 611: left button 612: right button
620: stop button
630: movement speed control volume
640: scroll button 641: upper button 642: lower button
650: reset button
700: means of transportation
710: guide rail
720, 730: first and second guide pulley
740: rotary pulley
750: motor
760: rotating line

Claims (5)

Trek main body provided with a fixed base to which an ultrasonic receiver is fixedly coupled, a moving block that is fixedly coupled to an ultrasonic transmitter and moves in a left and right direction by a moving means, and a start sensor and an end sensor for detecting the start and end movement of the moving block ;
An ultrasonic transmitter that is detachably coupled to the moving block to generate ultrasonic waves;
An ultrasonic receiver that is detachably coupled to the fixing table to receive ultrasonic waves generated by the ultrasonic transmitter;
A waveform shaping unit that amplifies the signal of low ultrasonic waves received by the ultrasonic receiver to shape it into a square wave, and a frequency signal transmitted from the waveform shaping unit in real time and moves a certain section in the left and right direction according to the moving speed of the ultrasonic transmitter. A CPU including a frequency information measuring unit that measures a frequency value that changes according to time, and a memory unit that stores frequency information measured by the frequency information measuring unit;
A display unit that displays frequency information stored in the memory unit; And
And a control unit for adjusting the left and right movement direction and movement speed of the moving block and initializing frequency information stored in the memory unit.
The method of claim 1,
Frequency information measuring unit,
A start detection unit for starting time measurement by receiving a detection signal from the start sensor as the moving block in the stopped state moves and contacts the start sensor;
An end detection unit for terminating time measurement by receiving a detection signal from the end sensor as the moving block in motion contacts the end sensor;
A time measuring unit for measuring a moving time in seconds during the moving distance from the start sensor to the end sensor of the moving block;
A frequency measurement unit that measures a frequency amplitude that changes for each time period measured by the time measurement unit; And
And an initialization unit for resetting the time recording and frequency recording measured by the time measurement unit and the frequency measurement unit.
The method of claim 1,
The CPU,
It includes a sensor position detection unit that detects the position of the moving block and prevents the motor of the moving means from continuously rotating while the moving block is positioned at the left or right end of the trek body and cannot be moved to the left or right any more. Sound Doppler effect experiment device, characterized in that.
The method of claim 1,
The moving means,
A guide rail provided in the center of the upper end of the trek body to guide the movement of the moving block,
First and second guide pulleys provided at both ends of the guide rail to guide the rotation of the rotation line;
A rotation pulley provided under any one of the first and second guide pulleys and coupled to the rotation shaft of the motor to rotate;
A motor that is axially coupled to the rotary pulley to rotate the rotary pulley in a left and right direction; And
And a rotation line that penetrates through the through hole formed at the lower end of the movable block, is wound around the outside of the first and second guide pulleys and the rotation pulley and rotates together in the rotational direction of the motor to move the movable block. Sound Doppler effect experimental device.
The method of claim 1,
The operation unit,
A movement direction button including a left button for moving the movement block in a left direction and a right button for moving the movement block in a right direction;
A stop button for stopping the moving block;
A moving speed control volume for adjusting a moving speed of the moving block;
A scroll button including an upper button and a lower button for scrolling the information displayed on the display in the vertical direction, and
And a reset button for initializing the frequency information stored in the memory unit.

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