摘要
有效地检测微弱信号是过套管仪器的核心技术之一。文章介绍了在频域进行的一种高质量的微弱信号检测方法,并用LabVIEW平台,设计出虚拟锁定放大系统,对实验室产生的模拟过套管测井微弱信号进行采集并作研究分析。试验表明,虚拟锁定放大系统可以较好地检测出信噪比不小于-30dB或最小检测信号幅值不低于10nV的微弱信号。因而,该系统可用于过套管微弱信号检测。
Detection of weak signals is one of the key technologies in cased-hole tools. An approach of high sensitive detection of weak signals in frequency domain is presented. The virtual system of Lock-in Amplifier based on LabVIEW is applied to detect the weak signals generated in laboratory. It is shown that the weak signals with greater than-30dB in SNR or 10nV in amplitude can be detected by virtual instrument of Lock-in Amplifier. Therefore, the virtual system can be used in detecting the weak signals through casing.
出处
《石油仪器》
2013年第5期17-19,1,共3页
Petroleum Instruments
