Study On Ultrasonic Remote Monitoring And Controling System For Liquid Level

In recent years, the technology of ultrasonic measuring distance is more and more widely applied, this is the reason that the ultrasonic measuring distance does not disturb the measuring object, and no polution, no divulge, no corrosion, and at the same time can be simply fixed and asserted. But the forthcoming normal apparatus of ultrasonic measuring distance only can simply digitally display measuring distance does not preserve and analyse the data. Furthermore, according to the data it can not control and change the parameters, or it's cost price is more high. Aim to the condition, this paper scientifically analyses the principal of the ultrasonic measuring distance, and according to actual requirement, devises ultrasonic measuring distance system which is aimed for analysing the obtained data and remote controlling and supervising. This system can activitily display and remotely transform the parameter of the apparatus of ultrasonic measuring distance through the computer. The ultrasonic remote monitoring and controling system for liquid level can realize the remote data's collection, supervising and controling. It lowers the people labor strength, and reduces the waste of the material and the financial power which is given rise to by artificial supervision and control, at the same time, increases the measuring accuracy, and avoids the deflection which is caused by the artificial reading data.This paper which makes ultrasonic remote supervising and controling system for liquid level as research object , mainly studies and discusses several aspects as following:Firstly, it not only systematically describes the feature of the ultrasonic wave which is used to check, and analyse the reverted pulse wave method of the principle of ultrasonic measuring distance, but also analyse the second reflexion of ultrasonic, and points out the second reflextion meaning; explouds the problem of blind zone, the last limitation and the outermost limitation of the principal of ultrasonic measuring distance and the solution of the last and outermost limitation.Secondly, it thoroughly researchs the characteristics of the remote communication, aiming to the characteristics of ultrasonic remote supervising and controlling system of liquid level, we adopts the telephone line connection mode which adapts the system and researchs the mode thoroughly, and detailedly introduce the software design;Thirdly, it thoroughly analyses the method of realizing the ultrasonic frequency, and picks out the method that is fit for the system. It analyses the mode of measuring ultrasonic spreading time, discusses the problem of blink zone, and in accordance with the actual condition confirms the system's blink zone. It measurs the surroundings temperature which mostly affect the ultrasonic wave speed, and in accordance with the actual condition adopts the temperature sensor chip which adapts the system. It describes in particular the MCU's remote communication, analyses and offer the transforming circuit of RS232 voltage and TTL voltage, and transmits the ultrasonic transmission time and conditional temperature to the computer.Fouthly, the computer calculates the acknologied data,and according to calculated result,simply activitily displays,and conserves the data in order to analyse and adjust the deflection etc..At last, the paper thoroughly researchs the deflection of the ultrasonic wave measuring, and detailedly introduces the cause of the deflection, at the same time,, bings up some measurement to avoid the deflection. Additionally, the paper provide the experimental result and experimental data.