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根据天然音频大地电磁场理论设计选频接收多个频点大地电场音频电场信号,用来定性了解地下地质体电性结构的观测方案.设计中采用微弱信号检测技术,对微弱的音频大地电场信号进行放大、滤波,选频检波、积分后读取音频大地电场信号.仪器可观测8Hz,16Hz,32Hz,64Hz,128Hz,256Hz,512Hz,1024Hz等8个频率的电场信号,在硬件设计与软件开发中利用多种可靠的技术,使设置抗干扰能力和系统的稳定性得到了加强.通过野外工作实例的对比分析,天然场选频仪能够反映地下一定深度范围内的地质信息,可用于地质矿产、工程物探及水资源的快速普查.
According to the theory of natural audio frequency electromagnetic field, the frequency field electric field signal of geoelectric field is received and used to qualitatively understand the observation scheme of the electrical structure of the underground geologic body.Weak signal detection technology is used in the design to detect the weak audio geoelectric field signal Amplify, filter, select the frequency detection, the integration of the reading signal of the electric field of the earth after the instrument can be observed 8Hz, 16Hz, 32Hz, 64Hz, 128Hz, 256Hz, 512Hz, 1024Hz and other eight electric field signal in the hardware design and software development By using a variety of reliable technologies, the anti-jamming capability and the stability of the system are enhanced.Compared with field working examples, the natural frequency-selecting instrument can reflect the geological information within a certain depth of the underground and can be used for geology and mineral resources, Geophysical prospecting and water resources rapid census.