摘要
本文针对过套管电阻率测井技术，提出利用直接数字频率合成技术，合成产生超低频率、高稳定度、高分辨率的正弦信号。设计实现了信号源的单片机控制模块、DDS信号产生模块、信号调理模块等。室内实验测试结果表明：信号源输出频率为0～10Hz，频率分辨率为0．004Hz，频率稳定度为：±5×10^—6／1小时。该设计已成功用于过套管电阻率纳伏级极微弱电信号采集理论与实验研究项目中。
This paper puts forward the application of digital direct frequency synthesis, ultra-low frequency signal and sine signal with high stability and high resolution, directing at the technology of cased hole resitivity logging. The designs of MCU control module, signal generator module with DDS and a signal disposal module were successfully made. The result of the indoor experiment shows that the signal source output frecluency is 0-10Hz, the frequency resolution 0.004Hz, and the frequency stability ±5×10^-6 per hour. The design has been successfully applied, in the research project of Extremely Weak nV-level Electric Signal acquisition theory and Experimental Study on Formation Resistivity Measurement Through Metal Casing.
出处
《微计算机信息》
2009年第13期152-153,207,共3页
Control & Automation
基金
基金申请人:张家田
项目名称:过套管电阻率纳伏级极微弱电信号采集理论与实验研究
基金颁发部门:陕西省科技厅自然科学基金(2007D01)
关键词
超低频信号源
直接数字频率合成技术
高分辨率
signal source with ultra-low frequency
Digital Direct Frequency Synthesis
High resolution
