The Development of Phasemeter for Taiji Space Gravitational Wave Detection
The Development of Phasemeter for Taiji Space Gravitational Wave Detection
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DOI：
10.1007/s12217-018-9625-6
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发表时间：
2018-12-01
影响因子：
1.8
通讯作者：
Jin, Gang
中科院分区：
文献类型：
--
作者：
Liu, Heshan;Luo, Ziren;Jin, Gang
太极空间引力波探测利用激光干涉仪将微小的距离变化转换为拍音的相位起伏。为了实现1 pm/ Hz的灵敏度，相位计需要在0.1 mHz和1 Hz的频率范围内以2 rad/ Hz的精度计算相位。本文报道了太极拳相位计的最新进展。对可能影响测量灵敏度的噪声进行了测试和讨论，特别是采样噪声和频率抖动。最后，对相位计的精度进行了标定。结果表明，在0.01 Hz ~ 1 Hz、0.1 mHz ~ 1 mHz频率范围内，灵敏度均达到了太极拳的要求。在1 mHz和0.01 Hz的范围内的噪声，这还没有得到很好的抑制，主要是由时钟抖动和热波动。
Taiji space gravitational wave detection utilizes the laser interferometer to convert the tiny distance change into the phase fluctuation of the beat note. As to realize the sensitivity of 1 pm/ Hz, the phasemeter needs to calculate the phase with the precision of 2 rad/ Hz in the frequency range of 0.1 mHz and 1 Hz. In this paper, we report recent progress of the phasemeter for Taiji. Noises which possibly affect the measurement sensitivity are tested and discussed, especially the sampling noise and the frequency jitter. Finally, the accuracy of the phasemeter is calibrated. The result shows that the sensitivity has reached the requirement of Taiji in the frequencies between 0.01 Hz and 1 Hz, 0.1 mHz-1 mHz. Noises in the range of 1 mHz and 0.01 Hz, which have not yet depressed well, are dominated by the clocking jitter and the thermal fluctuation.