Comprehensive test device and method of Doppler effect

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...

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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 changed. frequency experiment

In addition, its trolley movement is driven by weight pulleys, which cannot maintain a uniform movement, which is far from the theoretical definition

[0006] The acoustic Doppler effect instrument produced by PHYWE company in Germany is equipped with computer detection software and interface, but the detection frequency of the software is greatly limited, and it can only be more accurate in a certain range, and the precision is not high

In addition, the trolley is driven by batteries, and there are only two speed changes, and the changes in measurement parameters are very limited.

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