Research On The Capacitance Sensor Of Ice Thickness And Its Detecting System Based On CAV444

This topic is a basic research which is started in the National Natural Science Foundation project"the study of ice thickness sensor and its detection method"(Item Number:60672028) and"Outstanding Graduate in Shanxi Province funded projects focus on innovative projects"(Item Number :20081009).In recent years, polar ice melt leading to rising sea level has brought a huge impact for the survival of the human environment, flora and fauna, as well as global climate change. In addition, the widespread phenomenon of river ice in the northern winter makes a number of water conservancy facilities be in danger. Ice run hazard of Yellow River is a serious threat to the coastal people's lives and property and various hydroelectric dam. Considering the protection of the environment, the winter hydrology, water resources management and the ability of anti-ice designs hydraulic structures, we should know the basic characteristics of the ice.The ice thickness sensor based on the characteristic difference of resistance among air, water and ice has been actually used in the 21st,22nd,24th Chinese Antarctic Scientific Expedition,which is raised by Professor Qin Jianmin and so on in Taiyuan University of Technology. However, there are still some problems about testing mechanism and system architecture issues in engineering applications, which need to be resolved, such as the determining methods of ice interface and lower interface, which is an important research topic in the National Natural Science Foundation Project (60672028). In view of this, the foundation project team members proposed a new ice thickness detecting idea based on the capacitance differences of air, ice and water, so as to find a new way that determine the ice interface and the lower interface accurately. The project team members have carried out a number of mechanism experiments by the capacitance measuring instrument-TH2618B in the laboratory before, however, the experiments can not completely simulate the actual scene of ice thickness detection. Therefore, the author designed a ice thickness detecting system based on CAV444, which can solve this problem and achieve the automatic acquisition, storage and display of the capacitance value and the temperature. We obtained a large number of valuable experimental data in laboratory and well completed scheduled research tasks in National Natural Science Foundation.Combination of this experiment, this paper includes these as follow:1) Introduce the background and significance of this research and analysis of the status quo of ice thickness monitoring at home and abroad.2) Carry out a lot of capacitive mechanism experiments base on the differences from air, ice and water by choosing varieties of capacitive sensors test equipment.3) Focus on the principle and typical application of the capacitance-voltage integrated circuit CAV444 and introduce the other capacitance measuring circuits briefly.4) Give a detailed introduction about hardware circuits and software design of the capacitive ice thickness sensor and its detection system based on CAV444.5) Carry out further experiments about the capacitive mechanism experiments base on the differences from air, ice and water as well as the comparative experiments between ice strength and ice capacitance.A large number of experiments shows that the new auto-detecting system run stably and is able to reflect site conditions of ice thickness detection accurately, which provides more accurate and reliable datas for the mechanism experimental study of capacitive differences from air, ice and water.