Design And Implementation Of Seabed Boundary Layer In-situ Micro Section Monitoring System

The development and utilization of marine resources and marine energy, thestudies of that such as ocean and the change of global environment andclimate, marine environment and the earth’s ecology, is the most practical way inwhich We human beings can maintain its survival and development, expand the livingspace, make full use of the earth which is the only resource rich areas. To developocean, we need to get a wide range of marine environmental data which is accurateand reliable, and the need for seabed exploration, underwater construction and othertasks. So this will require a series of marine development technologies to support it,including ocean remote sensing, deep-sea exploration, marine navigation, etc. Inrecent years, the seabed boundary layer in-situ monitoring technique has been paidmore attention of the country and developed rapidly. The seabed boundary layer is aregion in which the physical and chemical interaction is very complex. And it’senvironmental data including pH, dissolved oxygen, temperature, conductivity, flowrate, the content of carbon dioxide and methane, pressure etc. The seabed boundarylayer in-situ monitoring technique is an underwater observation technique whichassembles marine equipments and electrical technology, and can processes fixed andcontinuous monitoring of the change of physical and chemical parameters. In addition,using micro section data collection technique, we can get more accurate and detaileddata in seabed boundary layer. The research and development of seabed boundarylayer in-situ monitoring technique has an extremely important significance inpromoting deep-sea scientific research and the innovation and progress of seabedexploration and development technology.The system which is based on Linux2.6software platform uses ARM9as acontrol core, MSP430SCM as a power control module core. It integrates deep-seasensors and a stepper motor and uses a double ARM embedded system redundancycontrol and data storage design. The system controls the frame of sensors to work at three different heights successively by stepper motor. In this way, the system realizesthe real time, automatic, stable control and data storage function.In order to illustrate the importance and urgency of developingseabed monitoring technique, this paper first introduces the development of deepseabed boundary layer in-situ monitoring technique at home and abroad. Then we putforward the basic framework of the seabed in-situ monitoring system. Secondly,the paper discusses in detail the specific composition of seabed in-situ monitoringsystem in both hardware and software. In the hardware part of the paper, we introducethe circuitries of data collection system and power control system, and then showthe schematic diagram and the material object’s picture of the key circuit. In thesoftware part of the paper, we introduce the constructional process of embeddedLinux software platform, Including the transplantation of U-boot which is aboot program, and the compilation and transplantation of Linux2.6.30kernel. Thirdly,the paper discusses in detail the writing of which is the key part of the micro sectiondata collection system’s application program. The application program usesembedded C language, and uses multi-thread programming to improve the runningefficiency of the program. The program is divided into3main threads. The mainthread is mainly responsible for the control of the entire system, including thecommunication between the two embedded ARM systems which one is master systemwhile another is slave system, controlling the equipment’s power in thesystem by sending commands to SCM, monitoring the operational status of thesystem, etc. Data acquisition thread is primarily responsible for controlling each deepsensor to collect data, and then receive data when the sensors sent it to embeddedARM system and store the data to the SD card which is mounted on the ARM board.Data upload thread is mainly responsible for the communication with PC aftersystem recovery, and then upload the collected data. Next the paper shows pictures ofseabed boundary layer in-situ micro section monitoring system‘s material object andexperiment. In the end, we summarize the paper and foresee the further research.