论文标题
直接数字合成器有限分辨率对原子重量表的影响
Impact of direct digital synthesizer finite resolution on atom gravimeters
论文作者
论文摘要
我们报告了对RAMAN LASER BEAMSPLITTERS频率差的chiRP速率有限分辨率的影响，该研究的影响到自由秋季原子重量表的相位。这次鸣叫引起了由于重力加速而弥补的相移，从而可以在频率方面进行精确的确定。实际上，它通常是由直接数字合成器（DDS）生成的。除了最终的截断误差的影响外，我们在这里评估了由于DDS生成的CHIRP的有限时间和频率分辨率而导致的G测量偏差，并表明它可以损害测量精度。但是，由于干涉仪相位分辨率和诱导偏差之间的权衡取舍而产生的DDS CHIRP参数可以通过足够的选择来减轻这种效果。
We report on the study of the impact of the finite resolution of the chirp rate applied on the frequency difference between the Raman lasers beamsplitters onto the phase of a free fall atom gravimeter. This chirp induces a phase shift that compensates the one due to gravity acceleration, allowing for its precise determination in terms of frequencies. In practice, it is most often generated by a direct digital synthesizer (DDS). Besides the effect of eventual truncation errors, we evaluate here the bias on the g measurement due to the finite time and frequency resolution of the chirp generated by the DDS, and show that it can compromise the measurement accuracy. However, this effect can be mitigated by an adequate choice of the DDS chirp parameters resulting from a trade-off between interferometer phase resolution and induced bias.
