基于MEMS传感阵列的海底地形形变原位监测装置

In-situ monitoring device for seabed terrain deformation based on MEMS sensor array

为了满足南海天然气水合物资源试采环境评价的迫切需要,提出基于微机电系统(MEMS)传感阵列的海底地形形变监测技术及装置.开发基于MEMS传感阵列的多点同步采集系统,在实验室理想环境测试中,实现30 m×30 m区域的地形原位监测,地形形变监测分辨率优于5 cm且监测误差小于13 mm.构建三维海底地形变形矢量模型,利用MEMS传感器的扭转角和各节的长度确定传感阵列变形后的空间位置,采用细分算法拟合获得地形的表面形态.所提海底地形形变监测装置在水深为1203 m的天然气水合物试采区完成连续6个月的原位监测.海试结果表明,MEMS传感阵列观测到的地形最大沉降量为2 cm,最大抬升量为10 cm.

In order to meet the urgent need of environmental assessment of the trial production of gas hydrate resources in South China Sea,a seabed terrain deformation monitoring technology and device based on microelectro-mechanical system(MEMS)sensor array was proposed.The multi-point synchronous acquisition system based on MEMS sensor array was developed,and in-situ terrain monitoring in an area of 30 m×30 m was realized in the laboratory tests.The resolution of terrain deformation monitoring was better than 5 cm level,and the monitoring error was less than 13 mm.The three-dimension seabed terrain deformation vector model was constructed.The bend angle of MEMS sensor and the length of each segment were used to determine the position of the sensor array after deformation,and the subdivision algorithm was used to fit the surface shape of the submarine terrain.The proposed seabed terrain deformation monitoring device has completed in-situ consecutively monitoring for 6 months in gas hydrate trial mining area(water depth of 1203 m).The sea trial results show that MEMS sensor array observed a maximum subsidence of 2 cm and a maximum elevation of 10 cm.