摘要
大地电磁测深需要较宽频率范围的感应式磁传感器来探测大深度范围。感应线圈做为感应式磁传感器最前端的磁敏感部分,线圈的电感值较大程度上决定了传感器的上限频率。通过对不同参数线圈的电感值进行有限元仿真、测量,总结提出新的电感计算公式,计算值相对误差最大为5.5%。根据电感计算公式,对线圈优化设计后传感器高频段灵敏度可提高38%,频带扩展1.3倍。根据灵敏度标定与野外实验结果,自制传感器可满足大深度范围探测的需要。
Magneto-telluric （ MT） requires a wide frequency-range magnetic sensor to enable large depth range detection.The inductive coil is magnetic sensitive part for the inductive magnetic sensor in the forefront.The inductance of the induction coil largely determines the resonant frequency and the maximum frequency of the sensor . Based on the finite element simulation and the measurement on the coil inductance values with the different parameters , a new formula for calculating inductance is summarized and proposed .The relative error of calculating value is less than 5.5%.According to the formula, the sensitivity is improved by 38% and the frequency band is extended to 1.3 times at high frequency.According to the calibrated sensitivity and experiments in field, the sensor is able to meet the needs of large depth range detection .
出处
《电子测量与仪器学报》
CSCD
2014年第7期703-709,共7页
Journal of Electronic Measurement and Instrumentation
关键词
磁反馈
感应式
电感
谐振频率
magnetic flux feedback
inductive
inductance
resonant frequency
