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本文所述的相位测量系統主要是用于測定大功率行波管所产生的窄射頻脉冲的相位变化的。这种测量技术也适用于精确地测定工作过程中管子参量改变时所出現的相对相移。它是一个双臂系統,用一个平衡调制器产生一个偏置信号,同时用一个零拍检波器把相位信息轉换成一个高的中频信号。这种特殊的另值法,即使被比較的信号幅度在一个相当大的范围內变化时,也能保証高精度测量。
The phase measurement system described in this paper is mainly used to measure the phase change of narrow RF pulses generated by high-power TWTs. This measurement technique is also suitable for accurately determining the relative phase shift that occurs when pipe parameters change during operation. It is a two-arm system that uses a balanced modulator to generate a bias signal while using a zero-shot detector to convert phase information to a high-IF signal. This special alternative method guarantees high accuracy measurements even when the amplitude of the signal being compared varies over a relatively large range.