频率域感应式磁传感器灵敏度研究

The Research on Sensitivity of Inductive Magnetism Sensor in the Frequency Domain

频率域电磁勘探中接收磁场信号应用最广泛的传感器是感应式磁传感器,由于大地电磁场信号比较微弱,这就需要磁传感器有比较高的灵敏度。目前国内外多家公司都研制出具有宽频带、低噪声和高灵敏度的感应式磁传感器,其灵敏度的大小不一,到底多大比较合适没有一个标准。通过分析影响磁传感器灵敏度的要素提出了提高灵敏度的方法,之后通过室内和野外测试得知:磁传感器灵敏度(平坦部分)并非越高越好,适当的灵敏度可以提高信号传输过程中的信噪比。

The inductive magnetism sensor,as the receiver of magnetic field,is most widely used in the electromagnetic exploration of frequency domain. Because the magnetotelluric signal is very faint,the magnetic sensor needs high sensitivity. At present, many domestic and foreign companies have developed an inductive magnetism sensor with wide band,low noise and high sensitivity, but the sensitivity is different and there is not a standard on what is more appropriate. This paper puts forward the method of improving the sensitivity through analyzing factors that affect the sensitivity of magnetic sensor. At last, through the indoor and outdoor experiment,we know that the sensitivity of magnetic sensor （ flat part） doesn＇t mean the higher the better and the proper sensitivity can improve the signal tonoise ratio in the signal transfer process.