By counting the number of such X-rays while scanning the frequency of the laser pulse, the team could make a very precise measurement of the photon energy required to drive the 2s-2p transition.
通过统计所发出X光的数量，然后对照激光脉冲的频率，测量小组能得出一个非常精确的测量值，从2s能级到2p能级跃迁所需的量子能量。
Based on pulse counting principle, the high precision time interval can be obtained by measuring the number of the high-frequency reference clock through it.
设计了一种高精度时间间隔测量模块，该模块由单片机控制，采用脉冲计数原理，通过测量时间间隔内高频参考时钟个数，得到被测时间间隔的精确值。
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