Institute of Geophysics, China Earthquake Administration, No. 5 Minzudaxue Nanlu, Haidian District, Beijing 100081, China.
Sensors (Basel). 2021 Oct 2;21(19):6598. doi: 10.3390/s21196598.
Traditional fluxgate sensors used in geomagnetic field observations are large, costly, power-consuming and often limited in their use. Although the size of the micro-fluxgate sensors has been significantly reduced, their performance, including indicators such as accuracy and signal-to-noise, does not meet observational requirements. To address these problems, a new race-track type probe is designed based on a magnetic core made of a Co-based amorphous ribbon. The size of this single-component probe is only Φ10 mm × 30 mm. The signal processing circuit is also optimized. The whole size of the sensor integrated with probes and data acquisition module is Φ70 mm × 100 mm. Compared with traditional fluxgate and micro-fluxgate sensors, the designed sensor is compact and provides excellent performance equal to traditional fluxgate sensors with good linearity and RMS noise of less than 0.1 nT. From operational tests, the results are in good agreement with those from a standard fluxgate magnetometer. Being more suitable for modern dense deployment of geomagnetic observations, this small-size fluxgate sensor offers promising research applications at lower costs.
传统的用于地磁场观测的磁通门传感器体积大、成本高、功耗大，并且在使用上往往受到限制。尽管微磁通门传感器的尺寸已经大大减小，但它们的性能，包括准确性和信噪比等指标，并不满足观测要求。为了解决这些问题，我们设计了一种基于 Co 基非晶带磁芯的新型跑道型探头。这种单组件探头的尺寸仅为 Φ10mm×30mm。信号处理电路也进行了优化。集成了探头和数据采集模块的整个传感器尺寸为 Φ70mm×100mm。与传统的磁通门和微磁通门传感器相比，设计的传感器体积小巧，提供了与传统磁通门传感器相当的优异性能，具有良好的线性度和 RMS 噪声小于 0.1nT。从运行测试结果来看，与标准磁通门磁力仪的结果吻合良好。这种小尺寸的磁通门传感器更适合现代密集的地磁观测部署，以更低的成本提供了有前景的研究应用。
