Demonstration of an Ultraprecise Optical Bench for the Taiji Space Gravitational Wave Detection Pathfinder Mission

Liu, Heshan; Zhao, Ya; Sha, Wei E. I.; Wang, Zhi; Luo, Ziren; Jin, Gang

doi:10.3390/app9102087

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…To reduce the influence of environmental thermal stability on the system, a pair of laser interferometer prototypes were developed using an invar substrate and a few fused quartz elements [46]. By using a coordinate measuring machine (CMM) and the calibrated quadrant photodiode pair (CQP) to achieve accurate alignment, the final angle error and position error reached 100 µrad and 50 µm, respectively [47]. One interferometer twin was successfully applied to Taiji-1 and produced good in-orbit test results [48].…”

Section: Resolution Test Of the Laser Interferometer Measurement Systemmentioning

confidence: 99%

Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum

Wang,

Liu,

Dai

et al. 2023

Sensors

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In space gravitational wave detection missions, a drag-free system is used to keep the test mass (TM) free-falling in an ultralow-noise environment. Ground verification experiments should be carried out to clarify the shielding and compensating capabilities of the system for multiple stray force noises. A hybrid apparatus was designed and analyzed based on the traditional torsion pendulum, and a technique for enhancing the sensitivity of the torsion pendulum system by employing the differential wavefront sensing (DWS) optical readout was proposed. The readout resolution experiment was then carried out on an optical bench that was designed and established. The results indicate that the angular resolution of the DWS signal in optical readout mode can reach the level of 10 nrad/Hz1/2 over the full measurement band. Compared with the autocollimator, the sensitivity of the torsional pendulum is noticeably improved, and the background noise is expected to reach 4.5 × 10−15 Nm/Hz1/2@10 mHz. This method could also be applied to future upgrades of similar systems.

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Section: Resolution Test Of the Laser Interferometer Measurement Systemmentioning

confidence: 99%

Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum

Wang,

Liu,

Dai

et al. 2023

Sensors

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“…The feasibility of DWS (differential wavefront sensing) technology was verified with a pointing jitter of 10 nrad/ √ Hz. In the Taiji pathfinder mission, an ultraprecise optical bench was constructed in a vacuum tank [36]. The results indicated that a ranging noise of 6 pm/ √ Hz was achieved.…”

Section: Introductionmentioning

confidence: 99%

Research on Semi-Physical Simulation Testing of Inter-Satellite Laser Interference in the China Taiji Space Gravitational Wave Detection Program

Wang

Meng²,

Xu³

et al. 2021

Applied Sciences

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To guarantee a smooth in-orbit space gravitational wave detection for the Taiji mission, a semi-physical simulation test of inter-satellite laser interference is carried out. The semi-physical simulation test consists of three aspects: the establishment of the inter-satellite laser link, interferometry of the inter-satellite ranging, and simulation of the space environment. With the designed specifications for the semi-physical simulation platform, the test results for the inter-satellite laser interference can be obtained. Based on the semi-physical simulation test, the risks of inter-satellite laser interference technology can be mitigated, laying a solid foundation for the successful detection of in-orbit gravitational waves.

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“…Due to the existence of low-frequency gravitational wave radiation sources in space [2], space gravitational wave detection has become the next scientific hotspot for gravitational wave detection. In order to contribute to space gravitational wave detection, the Chinese Academy of Sciences started a space gravitational wave detection mission-Taiji Project [3][4][5][6][7]-in 2016. The plan will be implemented in three stages.…”

Section: Introductionmentioning

confidence: 99%

A Space Inertial Sensor Ground Evaluation System for Non-Sensitive Axis Based on Torsion Pendulum

et al. 2020

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The inertial sensor is the key measurement payload of the technology verification satellite of China’s space gravitational wave detection mission-Taiji Project, which uses capacitive sensors to sense the acceleration disturbance of the test mass under the influence of non-conservative forces in the frequency range of 10 mHz~1 Hz. It is necessary to perform a ground performance evaluation and estimate the working state of the payload in orbit. However, due to the influence of the earth’s gravity and seismic noise, it is impossible to directly evaluate the resolution level of the non-sensitive axis when testing with high-voltage levitation, which leads to incomplete evaluation of the performance of the inertial sensor. In order to implement this part of the test, the sensitive structure is designed and a torsion pendulum facility for performance testing is developed. The experimental results show that the measurement resolution of the non-sensitive axis of the inertial sensor can reach 9.5 × 10−7 m/s2/Hz1/2 under the existing ground environmental conditions and is mainly influenced by the seismic noise during the system measurement. If the inertial sensor enters orbit, the measurement resolution can achieve 3.96 × 10−9 m/s2/Hz1/2, which meets the requirements of the technology verification satellite for a non-sensitive axis. This proposed system also provides a reasonable method for the comprehensive evaluation of inertial sensors in the future.

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Demonstration of an Ultraprecise Optical Bench for the Taiji Space Gravitational Wave Detection Pathfinder Mission

Cited by 15 publications

References 22 publications

Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum

Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum

Research on Semi-Physical Simulation Testing of Inter-Satellite Laser Interference in the China Taiji Space Gravitational Wave Detection Program

A Space Inertial Sensor Ground Evaluation System for Non-Sensitive Axis Based on Torsion Pendulum

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