Precision measurement using cold atom has surpassed the traditional method, and become an important trend of current quantum precision measurement. Due to gravity, velocity of atoms changes continuously, and therefore, Doppler shift effect should be considered. In this paper, the probability of atom transition and velocity selective effect has been theoretically analyzed and calculated during the Raman pulse dura-tion. Furthermore, the loss of the active atom ofπ/2-π-π/2 scheme has been estimated, as well as the decay of the fringe contrast caused by atom loss.%冷原子干涉测量技术在重力加速度测量等领域已经超越传统测量方法, 成为量子精密测量的重要发展方向. 在干涉测量过程中, 由于原子受到重力场影响, 速度不断变化, 因此激光相对原子具有多普勒频移效应. 本文通过对原子跃迁概率及速度选择的理论分析, 计算了在拉曼激光脉冲持续时间内, 由于多普勒频移造成的原子跃迁概率改变. 进而, 具体计算了π/2-π-π/2干涉方案中, 频移造成的有效原子数损失, 及其对干涉条纹对比度产生的影响.
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