主要介绍了功率反演(PI)算法的基本原理和主要特性，以及在数字电路中的设计方法和功能实现。
The basic principle and property of PI algorithm are introduced. The design method and realization are also given.
该仪器以嵌入式计算机PCM3370E为控制和数据处理核心，实现对激光器、光子计数卡、门控电路工作时序的控制及能见度反演。
The meter adopts embedded computer PCM3370E as the system core for control and data processing, to realize laser, photon counter and gating circuit timing control and visibility inversion.
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