摘要
核磁共振测井中实际接收到的信号十分微弱,为能够有效地提取回波信号,该文提出一种微弱信号接收链路的设计方案,并辅以隔离与泄放电路以确保接收链路在探头高压发射与低压接收中能够很好地完成对微弱信号的预处理,且在最后对该接收链路噪声水平进行分析与实际测试。目前该接收链路已经成功应用于实际井下仪器中,并取得了较好的应用效果。
The actual signals receiving from NMR （nuclear magnetic resonance） logging is very weak. In order to pick up the echoes effectively, a design of receiving circuits for weak signals was proposed. An auxiliary part of decoupler and discharge circuits was used to preprocess the echoes perfectly when high exciting voltage and weak receiving signals upon the antenna. Noise of the receiving circuits was analyzed and tested practically. At present, this receiving circuit is used in actual downhole equipment with satisfactory results.
出处
《中国测试》
CAS
北大核心
2012年第3期94-97,共4页
China Measurement & Test
基金
中海油企业发展基金项目(H04010701W070552)
关键词
核磁共振
微弱信号
前置放大
高压隔离
高压泄放
NMR
weak signals
pre-amplifier
high voltage isolation
high voltage discharge
