子午工程二期感应式磁力仪. (Chinese)

The Earth's induced magnetic field is a result of the electrical current that is generated by the space current system within the Earth's interior. By observing Earth's induced magnetic field, we can acquire information on the space current system and the electrical structure of the Earth's interior, which is an important physical parameter to study the mechanism of space weather events and seismic sphere coupling. The Meridian Project has set up several induction magnetometers in the shape of a "#" along the longitudes of 120° E and 100° E and latitudes of 30° N and 40° N in China's mainland and Antarctic regions, to carry out fixed, long-term, and continuous measurements of the Earth's induced magnetic field. The first phase of the Meridian Project is equipped with 14 LEMI-30 induction magnetometers produced by Ukraine, which have been in routine operation since 2009 and will be integrated with the grid of the second phase of the Meridian Project. Thirteen induction magnetometers will be installed in the second phase of the Meridian Project, which is scheduled to commence operation in 2023. Together with the equipment already installed in the first phase of the Meridian Project, a network of 27 induction magnetometers will be established. China is independently developing the induction magnetometer of the second phase of the Meridian Project. The magnetic core incorporates a new alloy material with high permeability. The multi-piece superposition technology was adopted to effectively gather the magnetic field, enhance the induction output signal, and improve the sensor's ability to pick up weak signals. The test results show that the frequency range of the induction magnetometer used in the second phase of the Meridian Project is wider, up to 0.001–30 Hz; its sensitivity is high, with a resolution of 10 pT; and its long-term operation is very stable. [ABSTRACT FROM AUTHOR]

地球的感应磁场是空间电流体系在地球内部感应而成的电流所产生的磁场. 通过地球感应磁场的观测, 既可以了 解空间电流体系的信息, 也可以了解地球内部电性结构等信息, 是研究空间天气事件和地震圈层耦合机理的重要物理参量. 子午工程在我国大陆和南极地区东经 120°、100°和北纬 30°、40°线附近布设呈“#”字型分布的多台 (套) 感应式磁力仪, 开展固定、长期、连续的地球感应磁场测量. 子午工程一期配置有 14 台 (套) 由乌克兰生产的 LEMI-30 型感应式磁力仪, 自 2009 年开始观测, 至今一直正常运行, 并将与子午工程二期并网融合运行. 子午工程二期将布设 13 台 (套) 感应式磁力 仪, 计划于 2023 年投入运行, 与子午工程一期已布设设备共形成 27 台 (套) 的感应式磁力仪观测网. 子午工程二期感应式 磁力仪由我国自主研制, 磁芯采用高磁导率的新型合金材料, 通过采用多片叠加技术, 有效聚集磁场, 增强感应输出信号, 提高传感器对微弱信号的拾取能力. 研制方出厂测试、中国计量科学院测试以及在高淳地震台较长时间的实际观测, 结果表 明, 子午工程二期采用的感应式磁力仪的频带范围宽, 可达 0.001～30 Hz, 灵敏度高, 分辨力达 10 pT, 长期运行稳定好. [ABSTRACT FROM AUTHOR]

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