The Ultrasonic Ranging System Based On Microprocessor Controlled Study

The features of the good performance, low cost, easy use are incarnated in the ultrasonic distance measurement sensor. The ultrasonic distance measurement sensor is usually used at the scene robot positioning system, automatic vehicle navigation, the safety of vehicles traveling support system, the urban traffic management and the highway management monitoring system, as well as the detect in rivers, oil wells, storages and materials. The ultrasonic wave transmission is not easy to disturb, its energy consumption is slowly and it can be transmitted distantly in the medium, so it is frequently used in ultrasonic distance measurement. For example, the range finder and the material level finder can be achieved by ultrasonic wave. Therefore, the in-depth study of the generation and transmission law of ultrasonic and the development of high-performance ultrasonic sensor and transmit and receive circuits is of great practical significance in the development of ultrasonic detection technology.An non-contact ultrasonic distance measurement system based on microprocessor is presented, and the software and hardware are introduced in this paper. The integrated chips of CX20106A and DS18B20 are separately used in the detection accepting circuit and in the temperature compensation circuit in the system. The system could measure certain distance with the reflected wave on condition in which the speed of transmitting wave is fixed. This paper generally specifies the theoretical foundation of the system and summarizes the development and fundamental principle of ultrasonic detection. The paper proposes the whole structure of the system by introducing the function of ultrasonic distance measurement. Moreover, it presents the theory and characters of ultrasonic sensor and studies the transmit and receive circuits of the ultrasonic sensor. The integrated chips are separately used in the detection accepting circuit and in the temperature compensation circuit in the system, reducting the mutual disturbance between circuits and the eletrical noise. At last, the result and error analysis of the experiment is presented.The various parts of the circuit and the whole system are tested in the process of the paper researched. It is proved by experiments that the main waveform and technical indexes are achieved the design requirements. The features of the simple hardware, stable operation, distinct programme flow and high accuracy are incarnated in the proposed system. The results can also be displayed in real-time. The design of the system is provided with high accuracy and reliability in the limited range of distance measurement. Finally, the causes of the error are analysised and the improvements of the system are also presented in the paper.