In order to improve the signal noise ratio and the precision of the analysis, a "two-level sifting" is processed in recording and analyzing VLP by HOLTER.
The railway signal auto-control system is a level of power supply load, which requires two lines of high quality power supply.
铁路信号自控系统是一级供电负荷，要求有两路高质量的供电电源。
3
The results show that the Doppler background due to the near resonance of the intermediate level is eliminated and the signal of two-photon transition can be distinguished from saturation absorption.