Abstract: In order to meet the demand for monitoring massive data in coastline waters, a seawater parameter measurement system designed to operate on board a ship is designed. On the ARM9 platform, the system expands the hardware circuits such as power supply, communication interface, control interface and A / D, and realizes automatic control through the application program written in EVC 4.0, which completes the measurement of water quality parameters and GPS positioning parameters in turn. Reading, sending data to the data center through the GPRS short message sending terminal, and storing the data in the machine with an SD card. The system can complete 8-channel A / D conversion at the same time, suitable for the measurement of a variety of seawater parameters, small size, flexible application, and comes with LCD touch screen, easy to operate. The data center PC program written by C # in Visual Studio 2010 is part of the entire system. With GPRS as the carrier, remote data transmission and simple remote control are realized.
Keywords: ARM9; seawater monitoring; remote data transmission; water quality parameters
0 Preface
The coastal zone is the most sensitive part of the ocean to human activities, and human activities will have a serious impact on the structure and function of its ecosystem. This makes the coastal zone a vulnerable area of ​​marine ecological environment. Therefore, the safety and management of the coastal zone has become a hot international research field. The scientific management of the coastal zone is based on a large amount of data. The traditional coastal zone survey requires a lot of manpower and material resources, and the data obtained is very limited. High-throughput coastal zone data acquisition has become a major bottleneck restricting coastal zone scientific management.
Countries with high levels of marine research represented by the United States and the European Union have developed various forms of marine monitoring systems, such as Buoy, towed monitoring ship (Tow), glider (Glider), satellite remote sensing, and seabed Observation stations, etc., to obtain massive data.
Here, a new method of marine data collection is introduced, and a set of collection system--Automated Instrument Packages on Ships of OpportuniTIes is developed. It is a kind of integrating a variety of marine environment monitoring sensors, sailing with the ship, real-time sampling of the entire route along the line, and the data can be passed directly
It is a marine data collection mode that can be transmitted to a data center remotely, and the data can also be stored on the ship, and the data can be obtained regularly.
Compared with other marine data collection systems, shipboard monitoring systems have the following advantages:
(1) Sufficient energy. Ships can provide energy for the system and facilitate the application of more complex analysis systems. Therefore, different sensors can be used according to different functional requirements to integrate the corresponding shipboard monitoring system.
(2) The working environment is good. The working conditions of the system can be guaranteed inside the ship, which is convenient for installing more delicate equipment.
(3) Easy maintenance. No auxiliary maintenance costs are required, and maintenance costs are low.
(4) The data source is wide and the accuracy is high, and data parameters of different time and space can be obtained.
Based on the above advantages, we can see that the shipboard monitoring system has a broad application prospect. By placing the system on a commercial ship on different routes, the entire coast monitoring system of China can be established; if placed on an ocean-going ship, a large amount of ocean surface seawater data can be obtained.
1 System principle
The system uses ARM9 as the control core, which is composed of sampling, testing, storage and transmission. After the system is started, the pump is turned on by the software control. The sensors installed in the water storage device measure the pH, conductivity, dissolved oxygen, temperature and other parameters of the seawater, and the position parameters are obtained by GPS. Bring your own SD card or send data to the data center via GPRS. The PC or industrial computer in the data center receives the data from the same GPRS, processes it in the data center program, and stores it in the database. The working principle is shown in Figure 1.
2 Hardware design
2.1 Cabinet design
The whole system is installed in the box of stainless material, which can protect the system to work normally under certain bad weather conditions. The box size is 555 mm & 519 mm & 454 mm, divided into three layers, the upper layer is a push-pull distribution box, the middle layer is a water storage tank and a water pump, and the lower layer is equipped with a battery. The upper cover and front and rear walls of the box can be opened to the side, which is easy to install and move. The structure is shown in Figure 2.
Among them, the distribution box is fixed on the slide. After the upper cover is opened to the side, the distribution box can be pushed to the rear side, so that the lower equipment can be disassembled or debugged without disassembling other devices. The water storage tank has water inlet and outlet, upper cover, conical air filter cover and other components. As shown in Figure 2 (b) above, seawater flows from the water inlet through the inner pipe to the tapered filter hood, and the gas passes through the connecting hose from the center port of the upper cover to the drain pipe. The lower edge of the cover flows out, thereby reducing the gas entering the water storage tank to prevent it from affecting the performance of the sensor. The upper cover part mainly has a water outlet and a sensor installation port. The reason why the air outlet is positioned on the upper cover is also based on the consideration of reducing gas accumulation in the water storage tank. A sealing gasket is added between the upper cover and the water storage tank body, and the bolts are connected. The physical appearance of the system is shown in Figure 3.
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