Comprehensive test device and method of Doppler effect

An experimental device and Doppler effect technology, applied in the field of physical experimental devices, can solve the problems of limited changes in measurement parameters, low precision, and few instruments

Inactive Publication Date: 2007-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Doppler effect is an important content of university physics. At present, there are many teaching and demonstration instruments for the Doppler effect, but there are few instruments used for experiments, and there are many deficiencies that cannot be accurately measured.
[0005] Domestic similar instruments include the Doppler effect experimental instrument produced by Chengdu Century Zhongke Instrument Co., Ltd., which uses ultrasonic transducers for signal transmission and reception. Due to its limitations, only one signal frequency can be used in the experiment, and the signal cannot be chan

Method used

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  • Comprehensive test device and method of Doppler effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 Doppler effect comprehensive experimental device

[0054] Referring to accompanying drawing 1, the inventive Doppler effect comprehensive experimental device is composed of three parts: a host computer, a signal generation controller, and signal acquisition and processing.

[0055] The motor rotates to drive the belt pulley to make the dolly 4 move on the track of the support 1. The motor and the pulley are fixed on the support 1, the dolly 4 is fixed with the belt 2, and the light blocking sheet 3 is installed on the 4 sides of the dolly. Adjust the speed of the motor through the speed control knob 5 to change the moving speed of the trolley. The photoelectric gate 14 is used to measure the elapsed time of the dolly 4 and calculate the moving speed of the dolly 4 . The position of the photoelectric gate 14 can be moved and changed, and the time value is displayed in the time display window 13. On the panel of the signal generation controller 8, there are...

Embodiment 2

[0059] Embodiment 2 The position of the sound source is fixed, the receiver follows the movement of the trolley, respectively measures the frequency of the received signal when it is moving and at rest, studies the phenomenon of the Doppler effect of waves, verifies the Doppler effect, and calculates the speed of sound.

[0060]

[0061]

[0062] data processing:

[0063] Perform spectrum analysis on the recorded sound files through software. The frequency of the signal received when the car is stationary and when the car is moving is measured respectively. The frequency of the signal received when the car is stationary is the frequency of the sound source signal.

[0064] Sound source position is fixed v 2 = 0, the receiver follows the movement of the car, Doppler effect formula f = f 0 ( c + v ...

Embodiment 3

[0068] Embodiment 3 The position of the receiver is fixed, the sound source follows the movement of the trolley, and the frequency of the signal received when the trolley is moving and stationary is respectively measured to study the wave Doppler effect phenomenon, verify the Doppler effect, and calculate the sound velocity.

[0069]

[0070] 4

[0071]

[0072] data processing:

[0073] Perform spectrum analysis on the recorded sound files through software. The frequency of the signal received when the car is stationary and when the small first is moving is measured respectively. The frequency of the signal received when the car is stationary is the frequency of the sound source signal.

[0074] Receiver position fixed v 1 = 0, the sound source follows the movement of the car, the Doppler effect formula f = f 0 ( c c ...

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Abstract

This invention relates to a Doppler effect integrated experimental device including a host, a signal generation controller and a signal collecting and processing part, in which, the host is composed of a speed controller, an orbit, a step motor, a belt wheel, a dolly, a photoelectric gate, a sound source head, a signal receiver and a base, the sound source head or the receiver can be fixed on one end of the base, three photoelectric gates are installed on the side, the one at the middle is used in testing speed, and the two at both sides control stopping the dolly, which is fixed at the belt and mounted with barn plates at the side mounted with the sound source head and the signal receiver, the step motor drives the belt wheel to rotate after being turned on, the rev of the motor is controlled by the button at one side of the base to realize adjusting the speed of the dolly continuously, the position of the photoelectric gate testing the speed can be moved or altered, and the dolly can stop automatically by the gates at both sides of the orbit, the positions of the head and the receiver can be exchanged according to the experimental content.

Description

technical field [0001] The invention relates to a physical experiment device and an experiment method, in particular to a Doppler effect comprehensive experiment device and an experiment method capable of quantitatively measuring the speed of sound and object motion and verifying the Doppler effect. Background technique [0002] When two trains are running towards each other, the passengers must have such a feeling. When the trains are getting closer and closer, the whistle of the train becomes sharp and sharp, and after the train meets, as the distance between the two trains increases, the whistle The sound becomes thicker. This is caused by the Doppler effect, which is: if the wave source or the observer moves relative to the medium, or both move relative to the medium, the frequency of the wave or the received frequency will change or The phenomenon of both changes. [0003] The Doppler effect is widely used in scientific research, engineering technology, traffic manage...

Claims

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Application Information

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IPC IPC(8): G09B23/06
Inventor 陈红雨乐培界
Owner ZHEJIANG UNIV
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