Inertial sensor for space gravitational wave detection and its key technologies
Within the frequency range of 0.1 mHz to 1 Hz,the space gravitational wave detection mission measures robust wave source information.However,the residual acceleration noise level of the inertial reference test mass must be less than 10-15 m s-2/Hz1/2 because of the weak gravitational wave signal.As a core payload of the space gravitational wave detector,the inertial sensor protects the test mass from the influence of external stray forces through a series of functional settings and smart design,whereas a drag-free control system with micro-thrusters is formed,which uses capacitive sensor measurement and multi-degree of freedom drive control to maintain the high-precision free-fall movement of the test mass in space,providing a super-stable inertial reference for laser interferometry.To satisfy the strict acceleration noise criteria of the test mass,the inertial sensor is constructed using numerous subsystems and critical technologies with distinct roles.This paper begins by reviewing the history of space gravitational wave detection and then explains the fundamental principles and design limitations of space inertial sensors.Finally,it addresses the essential technologies associated with inertial sensor technology.
space gravitational wave detectioninertial sensorscapacitive sensing and electrostatic actuationcharge managementcaging and releasing
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