场源效应受场源高度、信号周期、电阻率、测点距离等的影响。
Source effects vary with field periods, resistivity, source altitude and observation location.
在非同步采样过程中，信号周期的测量是周期信号数字化测量和分析的重要环节。
In the course of non-synchronization sampling, signal period measurement is an important step in digital measurement and analysis of periodic signal.
采用正切细分法，对不足一个信号周期的条纹位移，实现了正确的辨向和高倍数细分。
Combining with tangent subdividing method, this method can correct the counting error, recognize the direction and subdivide the fraction of fringes displacement.
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