Abstract
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.
Highlights
In September 2015, the United States LIGO detector [1] for the first time directly detected gravitational wave signals and confirmed Einstein’s prediction about the existence of gravitational waves 100 years ago
Configuration sensitive structure is the key hardware in an inertial sensor sensor (IS) system, which consists of an electrode housing (EH) and a test mass (TM)
Based on the measurement the capacitive the corresponding electrode to test the non-sensitive axis acceleration of the. This system solves the problem that the division method, the sensitive structure is designed and a torsion pendulum facility is constructed to high-voltage levitationaxis cannot assess theofnon-sensitive axis of solves the IS on ground
Summary
In September 2015, the United States LIGO detector [1] for the first time directly detected gravitational wave signals and confirmed Einstein’s prediction about the existence of gravitational waves 100 years ago. The measurement resolution using the high-voltage levitation is 4 × 10−8 m/s2 /Hz1/2 , and the displacement resolution using the torsion pendulum can reach the order of magnitude of 10−11 m/Hz1/2. They performed the on-orbit functional verification in 2013 [30]. In order to complete the ground evaluation requirements of IS for the Taiji technology verification satellite, a type of sensitive structure used in the experiment is designed and a dedicated torsion pendulum measurement system is developed to complement the high-voltage levitation test and comprehensively evaluate the IS. A comprehensive summary of the work in this paper is concluded, and the future upgrade work is expected
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
