Investigation on Stray-Capacitance Influences of Coaxial Cables in Capacitive Transducers for a Space Inertial Sensor

Sensors
Jianbo YuZebing Zhou

Abstract

Ultra-sensitive inertial sensors are one of the key components in satellite Earth's gravity field recovery missions and space gravitational wave detection missions. Low-noise capacitive position transducers are crucial to these missions to achieve the scientific goal. However, in actual engineering applications, the sensor head and electronics unit usually place separately in the satellite platform where a connecting cable is needed. In this paper, we focus on the stray-capacitance influences of coaxial cables which are used to connect the mechanical core and the electronics. Specially, for the capacitive transducer with a differential transformer bridge structure usually used in high-precision space inertial sensors, a connecting method of a coaxial cable between the transformer's secondary winding and front-end circuit's preamplifier is proposed to transmit the AC modulated analog voltage signal. The measurement and noise models including the stray-capacitance of the coaxial cable under this configuration is analyzed. A prototype system is set up to investigate the influences of the cables experimentally. Three different types and lengths of coaxial cables are chosen in our experiments to compare their performances. The analy...Continue Reading

References

Dec 30, 2017·Physical Review Letters·Pierre TouboulPieter Visser
Feb 5, 2019·Micromachines·Tatsuho Nagatomo, Norihisa Miki
Mar 6, 2019·The Review of Scientific Instruments·C Gettings, C C Speake
May 3, 2020·The Review of Scientific Instruments·M ArmanoP Zweifel

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