MicrOBEM:小型海底电磁接收机  

MicrOBEM:a micro-ocean-bottom electromagnetic receiver

作　　者：罗贤虎[1] 邓明[2] 邱宁 孙珍[3,4] 王猛 景建恩[2] 陈凯[2] LUO Xian-Hu;DENG Ming;QIU Ning;SUN Zhen;WANG Meng;JING Jian-En;CHEN Kai(Institute of Marine Technology Methods,Guangzhou Marine Geological Survey,Guangzhou 510076,China;School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Marginal Sea Geology of CAS,South China Sea Institute of Oceanology,Guangzhou 511458,China;Southern Ocean Science and Engineering Guangdong Laboratory(Guangzhou),Nanhai Ocean Institute,Guangzhou 511458,China)

机构地区：[1]广州海洋地质调查局海洋技术方法研究所,广东广州510760 [2]中国地质大学(北京)地球物理与信息技术学院,北京100083 [3]南海海洋研究所中国科学院边缘海与大洋重点实验室,广东广州511458 [4]南海海洋研究所南方海洋科学与工程广东省实验室(广州),广东广州511458

出　　处：《物探与化探》2022年第3期544-549,共6页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目“拖曳式海洋可控源电磁法电场运动噪声压制与信号增强方法研究”(42174081);“海底MT的运动海水电磁噪声分离方法研究”(41804071);南海U形海疆线综合研究团队项目“U型海疆线—U boundary in the South China Sea”(2019BT02H594);广东省基础与应用基础研究基金项目“南海珠江口陆坡天然气水合物的电磁和地震联合反演解释研究”(2021A1515011526)。

摘　　要：海底电磁接收机主要用于海底大地电磁与可控源电磁信号高精度观测。针对现有海底电磁接收机(OBEM-Ⅲ型)体积大、功耗大、成本高等不足,开展了小型化、低功耗、低成本方面的技术研究。MicrOBEM小型海底电磁接收机开发了新的低功耗控制单元、低功耗前置放大器,配置了低功耗磁通门传感器,采取先进的电源管理技术,使得整机功耗由现有海底电磁接收机(OBEM-Ⅲ型)的1600 mW下降至500 mW(搭载感应式磁传感器配置)以内。针对传统的声学释放器昂贵、笨重(需要匹配更多的浮力材料)等问题,通过集成水声通讯模块,并增加外置的电腐蚀释放装置方式实现释放回收,MicrOBEM仅需一个直径为17 in(1 in=2.54 cm)的玻璃浮球作为浮体,大幅降低仪器的体积和硬件成本,提升了设备的集成度和作业效率。MicrOBEM的体积(不含测量臂等)相比OBEM-Ⅲ减少3/4,功耗减少2/3,成本降低1/2,并于2021年3月在南海南部开展了深水大地电磁试验,其大地电磁测量功能得到初步验证,具有小体积、低功耗、低成本的优势。Ocean bottom electromagnetic receivers(OBEMs)are mainly used for high-precision observation and measurement of magnetotelluric signals and controlled-source electromagnetic signals at the sea bottom.To overcome the shortcomings of large volume,high power consumption,and high cost of the existing OBEMs(OBEM-Ⅲtype),this study conducted technical research regarding miniaturization,low power consumption,and low cost.As a result,the overall power consumption of the existing OBEMs(OBEM-Ⅲtype)has been reduced from 1600 mW to 500 mW or less(by equipment of inductive magnetic sensors)due to the development of a low-power control unit and preamplifier,the installation of low-power fluxgate sensors,and adoption of advanced power management technology.Traditional acoustic releasers are expensive and bulky and require more suitable buoyant materials.By integrating the underwater acoustic communication module and being equipped with the external erosion wearing release device,the MicrOBEMs make release and recovery possible using only a 17-inch glass sphere,thus greatly reducing the volume and hardware cost of the instrument and improving the integration and operation efficiency of devices.Compared to the OBEM-Ⅲtype,the volume,power consumption,and cost of the newly developed MicrOBEMs are reduced by 3/4,2/3,and 1/2,respectively.A deep-water geomagnetic test was conducted in March 2021 in the southern South China Sea,preliminarily verifying the geomagnetic measurement function of the MicrOBEMs and reflecting that the MicrOBEMs have the advantages of small size,low power consumption,and low cost.

关 键 词：海底大地电磁 小型海底电磁接收机 水声通讯 

分 类 号：P631[天文地球—地质矿产勘探]