工矿自动化2026，Vol.52Issue(4)：29-36,8.DOI:10.13272/j.issn.1671-251x.2026030062
基于STM32的孔中瞬变电磁接收装置设计
Design of a borehole transient electromagnetic receiving device based on STM32
摘要
Abstract
Due to the large size of high-precision receiving circuits,existing borehole transient electromagnetic detection mostly adopts a separated structure with a surface receiver and a downhole probe.The signal transmitted through cables is prone to early-time high-frequency distortion and couples with downhole noise,and the dynamic range for weak signal acquisition is insufficient,which limits detection accuracy.To address these issues,a borehole transient electromagnetic receiving device based on STM32 suitable for narrow drilling spaces was designed,realizing the integration of the receiving antenna and hardware circuit.Because the borehole space limited the effective area of the receiving coil,the late-time secondary field signal was susceptible to background noise interference,which imposed higher requirements on the low-noise design of the miniaturized hardware system.A roadway-borehole three-dimensional electromagnetic model was established using COMSOL Multiphysics,and the optimal number of turns of the receiving coil was determined as 50 through simulation.An analog-digital separation design was adopted,and an ultra-low-noise power supply scheme consisting of cascaded DC/DC and a Low Dropout Linear Regulator(LDO)was constructed.A multi-stage low-noise analog conditioning chain of"low-noise preamplification-low-pass filtering-differential driving-programmable gain"was designed using low-noise chips,effectively suppressing digital noise coupling.Based on FreeRTOS,synchronous sampling at 50 kHz with a 24 bit ADC and multitask scheduling were achieved.Prototype test results showed that the background noise of the device was 490 nV at a sampling rate of 50 kHz,and the dynamic range reached 138 dB.In a surface-simulated borehole experiment,the device successfully identified a banded low-resistivity anomaly at depths of 8-18 m,verifying its capability to capture weak secondary field signals.关键词
水害防治/瞬变电磁法/孔中瞬变电磁探测/接收装置/低噪声设计/模数分离设计/低阻异常体/二次场信号Key words
water hazard prevention and control/Transient electromagnetic method/borehole transient electromagnetic detection/receiving device/low-noise design/analog-digital separation design/low-resistivity anomaly/secondary field signals分类
矿业与冶金引用本文复制引用
王泽昆,张航滔,刘俊翔,林文奇,王文达,胡杰..基于STM32的孔中瞬变电磁接收装置设计[J].工矿自动化,2026,52(4):29-36,8.基金项目
山西省自然基金面上项目(202203021221073) （202203021221073）
华阳集团新能股份有限公司技术开发项目(2019000902) （2019000902）
山西省大学生创新训练计划项目(20250166). （20250166）
