共模干扰衰减器设计

• 作 者: M.A.斯密瑟 A.佩特 严挹非
• 出 处: 石油物探译丛
• 发表日期: 1983年01期
• 关键词: 共模干扰 衰减器 共模信号 陷波器 高共模抑制 电缆线 地震记录 共模抑制比 三次谐波 地震信号

为消除输电线对地震记录的干扰所进行的各种努力,GEOSPACE公司研制的共模衰减器CMA是一种新的尝试,它将避免陷波器等装置的许多缺点。CMA本质上是一种自动调节的线路平衡器,使用该装置将使地震仪本身的高共模抑制特性获得充分发挥,从而使整个接收系统大大提高其抗共模干扰的能力。本文将介绍其原理和运用CMA所进行的试验。

The efforts of GEOSPACE, a common-mode attenuator developed by GEOSPACE, are a new attempt to eliminate the transmission line’s interference with seismic records and will avoid many of the shortcomings of devices such as traps. The CMA is essentially a self-regulating line balancer that will give full play to the high common-mode rejection of the seismometer itself so that the entire receiving system will greatly improve its immunity to common mode interference. This article describes its principles and tests conducted using CMA.