Dong Haifeng, Ye Hangfei, Hu Min, Ma Zongmin
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China.
National Key Laboratory for Dynamic Measurement Technology and School of Semiconductor and Physics, North University of China, Taiyuan 030051, China.
Micromachines (Basel). 2023 Dec 27;15(1):59. doi: 10.3390/mi15010059.
Optically pumped gradiometers have long been utilized in measurement in the International Geomagnetic Reference Field (IGRF). With advancements in technologies such as laser diodes and microfabrication, integrated gradiometers with compact sizes have become available, enabling improvements in magnetoencephalography and fetal magnetocardiography within shielded spaces. Moreover, there is a growing interest in the potential of achieving biomagnetic source detection without shielding. This review focuses on recent developments in optically pumped magnetic field gradiometers, including various fabrication methods and measurement schemes. The strengths and weaknesses of different types of optically pumped gradiometers are also analyzed.
光泵磁力梯度仪长期以来一直用于国际地磁参考场（IGRF）的测量。随着激光二极管和微纳加工等技术的进步，尺寸紧凑的集成磁力梯度仪已经问世，这使得在屏蔽空间内的脑磁图和胎儿心磁图测量得到了改进。此外，人们对在无屏蔽情况下实现生物磁源检测的潜力越来越感兴趣。本综述重点关注光泵磁场梯度仪的最新进展，包括各种制造方法和测量方案。还分析了不同类型光泵磁力梯度仪的优缺点。
