Note: Directly measuring the direct digital synthesizer frequency chirp-rate for an atom interferometer

作者：Tao, Juan-Juan; Zhou, Min-Kang^*; Zhang, Qiao-Zhen; Cui, Jia-Feng; Duan, Xiao-Chun; Shao, Cheng-Gang; Hu, Zhong-Kun

来源：Review of Scientific Instruments, 2015, 86(9): 096108.

DOI：10.1063/1.4930562

• TIME

During gravity measurements with Raman type atom interferometry, the frequency of the laser used to drive Raman transition is scanned by chirping the frequency of a direct digital synthesizer (DDS), and the local gravity is determined by precisely measuring the chip rate a of DDS. We present an effective method that can directly evaluate the frequency chirp rate stability of our DDS. By mixing a pair of synchronous linear sweeping signals, the chirp rate fluctuation is precisely measured with a frequency counter. The measurement result shows that the relative a instability can reach 5.7 x 10(-11) in 1 s, which is neglectable in a 10(-9) g level atom interferometry gravimeter.

• 出版日期2015-9
• 单位华中科技大学