Packaging Structure Design And System Integration Of Deep-sea Multi-parameter Chemical Sensor Based On Manned Submersible

The discovery of deep-sea hydrothermal activities is one of the most important events in marine scientific research in the 20 th century.It has both scientific and economic significance for the study of hydrothermal regions.In the future,the focus of deep-sea hydrothermal detection methods is in-situ measurement technology.In-situ measurement technology mainly relies on deep-sea in-situ sensors to carry out automatic and continuous measurements on the seabed.Deep-sea in-situ sensors are usually composed of internal optoelectronic components plus a packaging shell.According to the design requirements of deep-sea multi-parameter chemical sensors,the key technologies of sensor packaging and system integration suitable for deep-sea environment are solved in this paper.Firstly,according to the requirements of deep-sea multi-parameter chemical sensors,the technical specifications of sensor packaging structure were put forward,and two packaging schemes,split structure and integrated structure,were formulated.By comparing and analyzing the two packaging schemes,and combining with the technical specifications of sensor packaging structure,the packaging structure of sensor was determined as an integrated packaging structure.Then the structural design,strength calculation,stability check and sealing design of the ballast tank were completed according to the technical route of the integrated packaging structure design.Stress analysis and optimization of the pressure structure were carried out through ANSYS Workbench to ensure that the strength and stability of the packaging structure of the sensor can meet the depth requirement of 7000 m underwater.Through the analysis and comparison of various pressure self-balancing technologies,the pressure compensation mode of the outer skin bag was determined,the structure design of the self-balancing cabin was completed,the principle of pressure compensation was analyzed,the minimum compensation amount of oil in the self-balancing cabin was calculated,and the seal of the self-balancing cabin was designed in detail after the determination of the self-balancing structure.According to the requirement of packaging structure,we selected appropriate flow control components,used SolidWorks software to layout and optimized the sensor flow control system module to ensure the compact structure of the sensor,and carried out a series of voltage withstanding tests on the flow control components to ensure that they can work reliably and steadily in deep-sea high-pressure environment.Then,the sensor system was integrated,and two sets of sensor prototypes were assembled.The water tightness test of the tank and the joint debugging test of the wharf were carried out using the sensor prototype,and the measurement data were obtained successfully.Finally,the in-situ measurement scheme of the sensor at sea was designed.Through the research of this paper,a packaging structure of deep-sea multi-parameter chemical sensors has been successfully designed,which integrates two sets of sensor systems.It has accumulated some experience for the packaging technology and integration technology of deep-sea sensors,and also contributed to the improvement of in-situ measurement technology in China.