The principle and circuit of monitoring system in laser welding are introduced in this article, which consist of numeric control potentiometer, instrumentation amplifier and SCP for data processing.

介绍了由数控电位器、仪表放大器以及单片机构成的激光焊监测系统信号处理电路的工作原理及实用电路。

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Trunk amplifier is a important part of mobile communication network. We mainly discussed the design plan of the software and hardware architecture of the trunk amplified monitoring system.

干线放大器是移动通信网络的重要组成部分，我们主要论述了干放监控系统的软件结构设计方案。

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This paper summarizes the general principle and technical problems in optical fibre amplifier. The principle characteristics and functions of EDFA, which are commonly used in monitoring are described.

总结了光放大器的一般原理和技术难点，分类评述了常用的EDFA监控方案的工作原理、特点和性能。

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