title: The evaluation of phasemeter prototype performance for the space gravitational waves detection.
abstract: Heterodyne laser interferometry is considered as the most promising readout scheme for future space gravitational wave detection missions, in which the gravitational wave signals disguise as small phase variances within the heterodyne beat note. This makes the phasemeter, which extracts the phase information from the beat note, the key device to this system. In this paper, a prototype of phasemeter based on digital phase-locked loop technology is developed, and the major noise sources which may contribute to the noise spectra density are analyzed in detail. Two experiments are also carried out to evaluate the performance of the phasemeter prototype. The results show that the sensitivity is achieved 2π μrad/√Hz in the frequency range of 0.04 Hz-10 Hz. Due to the effect of thermal drift, the noise obviously increases with the frequencies down to 0.1 mHz.
authors.affiliation: National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: He-Shan
authors.initials: HS
authors.lastname: Liu
authors.affiliation: National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Yu-Hui
authors.initials: YH
authors.lastname: Dong
authors.affiliation: National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Yu-Qiong
authors.initials: YQ
authors.lastname: Li
authors.affiliation: National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Zi-Ren
authors.initials: ZR
authors.lastname: Luo
authors.affiliation: National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Gang
authors.initials: G
authors.lastname: Jin