An on-line monitoring system of vacuum pressure for 35KV vacuum tube is designed in this paper. The operation principle, hardware structure and software plan are explained in details. The system can valuate the internal pressure of the vacuum tube by monitoring the static charge of the shields using electrical field sensors with rotating electrode. At the same time, the data-collecting machine and the controller are developed for long-range and on-line monitoring. The result shows that such system runs steadily and reliably. It can estimate the vacuum degree accurately laying 35cm from the vacuum tube. Besides, it is steady and anti-jamming with less-cost.

For meeting the requirements of formulating a reasonable surgical planning by using PC before the orthopedic surgery, and for solving the problem that MIMICS cannot solve and post process biological tissue models, we present a new virtual orthopedic surgery system which can accurately predict the healing effects after analyzing the mechanical characteristics of biological tissue by combining finite element method with FEA software. According to the different operation plans formulate by orthopedic doctors, the different surgical results will be revealed from the virtual orthopedic surgery system by which the problem of choosing the best surgical procedure is solved and the functions of MIMICS is optimized. This paper introduces the overall structure, application platform, operating principle and major function modules of the virtual orthopedic surgery system, and then proves the practical applicability and reliability by an experiment.