电法地质状况勘探交流激电系统研究

Electrical Prospecting System Design of Geophysical Condition

文中研究用直接数字合成技术芯片AD9850构成频率可调交流激电系统。按键设置交流信号频率,随即键盘驱动芯片CH451向单片机发射对应的频率指令。单片机识别频率指令后并行向AD9850送出频率编码,AD9850输出的信号经过滤波放大,零点调节和V-I转换送出激电信号。将该信号源用于交流激发极化探地测量,保证了测量时频率精度和稳定性,而且频程转换快,噪声小。

This paper introduced a geophysical prospecting system.The system used an AC source generator making by DDS chip.AD9850 frequency was ranged convertible.Frequency can be set through the key that is dived by CH451.Then CH451 sent frequency code to MCU.MCU read the code and then sent frequency value of the code to AD9850 in parallel.The signal from AD9850 would be processed by filter,zero adjustment and V-I conversion.The signal source provides a high precision and stability AC signal,rapidly frequency rang change and low noise when it is used in geophysical prospecting.