文中论述了光调制特性、微分增益（DG）、微分相位（DP）、信噪比（S/N）等重要问题。
The optical modulation characteristics, differential gain (DG), differential phase (DP) and signal-to-noise ratio (S/N) are described as well in this paper.
简述了MD 1721型矢量示波器的工作原理和自检方法，微分增益失真dg和微分相位失真dp的测量方法。
This article simply introduces the work principles self-checking methods differential gain distortion DG differential phasic distortion DP of MD1721 Model Vector Oscollograph.
条纹的强度的相位分布同物体相位的一阶微成正比，所以称为微分相衬。
And the phase information, which is proportional to the first derivative of phase distribution, can be obtained from the fringes.
条纹的强度的相位分布同物体相位的一阶微成正比，所以称为微分相衬。
And the phase information, which is proportional to the first derivative of phase distribution, can be obtained from the fringes.
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