频率域激电信号采集平台研究

为提高传统频率域激电信号接收机的通用性，设计了一种可采集和处理变频信号、双频信号和伪随机多频信号等多种频率域激电信号的采集平台。该平台以STM32微控制器为核心设计硬件电路，实现低通滤波、程控放大、模数转换以及数据通信等功能；在LabVIEW中设计上位机，进行参数设置、数字滤波、频谱分析、幅值测量、求值计算等处理，得到幅频率等目标参数，并具有波形显示与回放、数据存储与查看等功能；设计了阻容网络模拟实验，3种激电法幅频率实测值与理论值绝对误差均小于0.5%。实验表明，平台能够灵活选取不同方法进行采集和处理，测量精度较高，在资源勘查以及煤矿水害探测等方面具有良好的应用前景。 

Acquisition platform of frequency domain IP signal

In order to improve the versatility of the induced polarization(IP) signal receiver of traditional frequency domain, a signal acquisition platform was designed, which can acquire and process IP signals of frequency domain such as variable-frequency signals, dual-frequency IP signals, and pseudo-random multi-frequency IP signals and so on. Hardware circuits were established based on STM32 to execute low-pass filtering, program-controlled amplification, analog-to-digital conversion, and data communication. The host computer was developed in LabVIEW to achieve parameter settings, digital filtering, spectrum analysis, amplitude measurement and calculation to obtain target parameters such as PFE, and has waveform display and playback, data storage and viewing functions. The experiment of the RC network model was carried out, three methods were used to measure the percent frequency effect(PFE), the absolute error of the PFE was less than 0.5%. Results showed that the platform has high measurement accuracy, and can flexibly select different methods for acquisition and processing. It has good application prospect in resource exploration and coal mine water hazard detection.