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瞬变电磁法是目前地球物理勘探领域里一种新兴的测量方法。它是在一次场衰减完之后观测二次场的时间域的勘探方法,然而其响应信号非常微弱,这就对调理电路的要求非常高。设计了一种能够放大有用信号、同时抑制噪声信号的调理电路。电路由前置放大电路、滤波电路和中间级放大电路组成。电路中,不仅通过选用合适的滤波电路来提高精度以及截止频率的稳定性,还通过制作良好的PCB和选择高精度器件来降低噪声的影响。通过实验,证明了调理电路的整体性能指标达到设计要求,从而方便了信号的后续处理。
Transient electromagnetic method is an emerging measurement method in the field of geophysical prospecting. It is a method of exploring the time domain of the secondary field after a field has been attenuated. However, its response signal is very weak, which requires very high conditioning circuitry. A conditioning circuit designed to amplify the useful signal while suppressing the noise signal is designed. The circuit consists of preamplifier circuit, filter circuit and intermediate stage amplifier circuit. In the circuit, not only by selecting the appropriate filter circuit to improve the accuracy and the stability of the cut-off frequency, but also by making a good PCB and select high-precision devices to reduce the impact of noise. Through experiments, it is proved that the whole performance index of the conditioning circuit meets the design requirements, thereby facilitating the subsequent processing of the signal.