Study On The DAQ And Control System Of Smart Sensor In Deep Sea

In-situ observation technique has been widely used in oceanic sciencific research. Encapsulated chemical sensors had already been successfully carried to deep sea in order to observe the hydrothermal fluid or the diffuse plume by the Deep Submergence Vehicle. And Smart Sensor is a kind of long-term observation system carrying chemical and physical sensors to carry out in-situ observation in deep sea.In comparison with traditional chemical sensors, Smart Sensor applied Flow Injection Analysis into deep sea. It is able to get over the time limit of the deep sea application of chemical sensors, and observe for a long period. Smart Sensor is more than a data acquisition equipment. It especially has a self-calibration system for chemical sensors which is built by flow control elements, and carries enough standard buffer solution needed in self-calibration. It will keep observing until the veracity of the chemical sensors fall below the requirement of observation, and then it will start up the self-calibration program which is programed according to the requirements of the chemical sensors.The contents of this dissertation are the researches on the DAQ and control system of Smart Sensor. It mainly includes DAQ system and self-calibration control system of the chemical sensors. The principle and technique flow of Smart Sensor, and the theories of the sensors and the flow control elements are given in the fisrt part. Based on the theories and principles above, the design of the circuit and the software on PC is introduced in the middle part of this dissertation. More detailed descriptions of the microcontroller application of SD memory and the software design with LabVIEW are given in separate chapters. Some experiments are given at last to prove that each part of the DAQ and control system of the Smart Sensor is able to work well.Smart Sensor in this dissertation is an attempt to the long term in-situ observation in deep sea. It is still in the first phase which means the main targets are not strict enough and may be increased later. So space for expansion is reserved during the design, such as the variety and amount of sensors, volume of the flash memory, interface of the flow control components, functions of the software on PC and so on.