Research And Application Of Remote Monitoring For Scientific Instrument Working State

The System of Large-scale Scientific Instrument Working State Monitor Project is one part of National Science and Technology Basic Condition Platform Project of China. This system could monitor the effective working hours of the large-scale scientific instrument objectively, provide technical support for effective management of large-scale scientific instrument, and improve the use ratio of large-scale scientific instrument consequently.In order to satisfy the requirement of monitoring system construction for scientific instrument working state, the monitoring standard of main types of large-scale scientific instruments was established, the monitoring technology for working state and the embedded Internet technology were studied. On this basis, the monitoring device for the working state of scientific instrument which support remote communication was developed. Then the remote monitoring for working state of large-scale scientific instrument was realized. The following contents of research were involved in this work:⑴Research and establishment of the monitoring standard for scientific instrument working state.The structure and working state of large-scale scientific instrument are complicated. It should be carefully studied on how to determine whether the instrument work effectively. In this work, the definition of effective working hours was presented. It was defined as the practical sample-testing time of large-scale scientific instrument excluding the time spent on sample pre-treatment and analysis of the results after testing. Based on the definition of effective working hours, the monitoring standard for working state of instrument such as electron microscope,X-ray equipment,mass spectrograph was studied and established. The monitoring standard provided the theoretical and scientific basis for the monitor of large-scale scientific instrument working state.⑵Study on the monitoring technology for the working state of scientific instrument.The characteristics which can reflect the instrument's effective working state were studied thoroughly and then were summarized and sorted. According to the characteristics of the various types of instruments, touch and non-touch monitoring methods for the work state of scientific instrument were proposed. For the touch monitoring method was carried out difficultly, this paper focused on the study of non-touch monitoring methods for scientific instrument working state. The non-touch detection technologies, such as photosensitive resistor,infrared tube,ultrasonic and so on, were used to monitor the various types of instrument's working state.⑶Study on the remote communication technology of embedded device.The key issue of the remote monitoring system is how to upload the monitor information to the remote monitoring server, and this is also the emphasis of this thesis. The existing connection modes of various units'LAN (local area networks) to Internet were investigated and classified into four categories: connection directly, connection through HTTP Proxy Server, connection through NAT (Network Address Translation) gateway, connection through Wireless Router. And then the remote communication technologies of embedded devices in four types of LAN were studied respectively.①Study on the remote communication technology based on direct interconnection network. According to the situation that some units connected LAN to Internet directly, the remote communication scheme based on socket mechanism was chosed. The simplified TCP protocol was presented on 8-bit microprocessor by reducing the TCP/IP protocol stack, then the network communication module which support socket mechanism was developed. The communication between local embedded device and remote monitor system was realized.②Study on the remote communication technology based on HTTP Proxy Server.According to the situation that some units connected LAN to Internet through HTTP Proxy Server, the communication scheme of remote monitoring based on HTTP Proxy Server was proposed. Compared to existing scheme of remote monitoring, this scheme saved more IP address resources and reduced the costs of operation and construction of the monitoring system. The communication technology of embedded device which support HTTP Proxy Server was studied: based on the Browser/Server (B/S) framework and authentication principle, the process of communication between embedded device and HTTP Proxy Server was analyzed; the simplified HTTP protocol was presented on 8-bit microprocessor by reducing the TCP/IP protocol stack, the encryption algorithms were designed for HTTP Proxy Server basic authentication and Integrated Windows authentication respectively. Then the network communication module which support HTTP Proxy Server was developed. The problem that the existing embedded device could not realize remote communication in these units was solved consequently.③Study on the remote communication technology based on NAT gateway.According to the situation that some units connected LAN to Internet through NAT gateway, the communication scheme of remote monitoring based on NAT gateway was proposed. The communication technology of embedded device which support NAT gateway was studied: based on the communication mechanism and authentication principle of NAT gateway, the process of authentication between the embedded device and NAT gateway was analyzed; the simplified HTTP protocol was presented on 8-bit microprocessor by reducing the TCP/IP protocol stack, and the BASE64 encryption algorithms was designed for NAT gateway authentication. Based on these, the network communication module supporting the non-encryption authentication and basic authentication of NAT gateway was developed. The problem that the existing embedded device could not realize remote communication in these units was solved consequently.④Study on the remote communication technology based on Wireless Router.According to the situation that some units had constructed Wireless LAN and connected to Internet through Wireless Router, the communication scheme of remote monitoring based on Wireless Router was proposed. The technology of embedded device supporting Wireless LAN communication was studied: the working principle of client model of wireless access point was analyzed, and the simplified HTTP protocol which used for controlling wireless access point was presented on 8-bit microprocessor. Based on these, wireless communication module supporting wireless LAN communication was developed. The problem that the embedded device based on 8-bit microprocessor could not realize the wireless LAN communication was solved.⑷Development of the monitoring device for the working state of scientific instrument.The monitoring device for the working state of scientific instrument was developed, which integrated the state monitoring technology and the embedded Internet technology. Practical applications showed that the monitoring device could monitor the working state of various types of scientific instrument effectively, record the effective working time of scientific instrument. It could also break through the restriction of various LANs, and upload the monitoring information such as the effective working time of the scientific instrument to remote monitoring server. Then the remote monitoring of the working state of scientific instrument was realized. By the research and application of the remote monitoring technology for working state of large-scale scientific instrument, the remote monitoring of scientific instrument working state had been realized. It provided a basis for the management and evaluation of large-scale scientific instrument, and furthermore, it provided a policy support for reasonably purchase and distribution large-scale scientific instrument. The method of monitoring and the technology of communication could be applied to other types of distributed monitoring systems, such as environmental remote monitoring systems, on-line remote monitoring systems for industry, remote monitoring systems for oil and gas transportation pipelines and so on.