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1. Translate the abstract of the paper into English (English experts are advised not to translate online)
Ultrasonic ranging method is rapid, convenient, simple, easy to achieve real-time control, mentioned the ultrasonic distance measurement system based on MCU design can be more in-depth understanding of SCM application.This design uses a microcontroller as the core of low cost, high precision, miniaturization digital display ultrasonic rangefinder hardware circuit and software design. After starting the system, an ultrasonic emission head emission of ultrasonic transmission in the air after a period of time in front of the objects to be detected by the reflected back by the ultrasonic receiving head, ultrasonic receiving circuit, the receiving chip for signal amplification shaping, ultrasonic receiving circuit receives the echo after sending a drop level to enter the interrupt program, in the interrupt program SCM temperature detection circuit, from reading the numerical and converting the current temperature velocity, using the time difference method to calculate the detection distance, finally all the data in the LCD display circuit displays. The design uses the modular design, the hardware, including the microcontroller module, temperature compensation module, ultrasonic receiving module, LCD module. In software design, through the general program will ultrasonic ranging program module, display module, temperature measurement program module, external interrupt module organically unifies in together. The probe signal by single chip integrated analysis and processing, to achieve various functions of ultrasonic ranger. On the basis of the overall system design, hardware and software by the end of each fu
2. High score thesis proposal
Relevant information: Measurement principle of ultrasonic Doppler flowmeter 1. Basic working principle The measurement of ultrasonic Doppler flowmeter is based on the Doppler effect in physics. According to the acoustic Doppler effect, when there is relative motion between the sound source and the observer, the frequency of the sound perceived by the observer will be different from the frequency emitted by the sound source. The frequency change caused by relative motion is proportional to the relative velocity of two objects. In the ultrasonic Doppler flow measurement method, the ultrasonic transmitter is a fixed sound source, and the solid particles moving with the fluid act as the "observer" of relative motion with the sound source. Of course, it only reflects the ultrasonic waves incident on the solid particles back to the receiver. The frequency difference between the emitted sound waves and the received sound waves is the Doppler frequency shift of the sound waves produced less due to the motion of the solid particles in the fluid. Since this frequency difference is proportional to the fluid flow velocity, the measured frequency difference can obtain the flow velocity, and thus the fluid flow rate can be obtained. Therefore, A necessary condition for ultrasonic Doppler flow measurement is that the measured fluid medium should be a two-phase medium containing a certain
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