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Core Payload of the Space Gravitational Wave Observatory: Inertial Sensor and Its Critical Technologies
Shaoxin Wang1,2, Dongxu Liu1,2,3,4, Xuan Zhan1,2,4
1Center for Gravitational Wave Experiment, National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.
Sensors (Basel, Switzerland)
|December 17, 2024
Summary
Space-based gravitational wave detection requires ultra-precise inertial sensors to overcome ground limitations. These sensors shield test masses from noise, enabling sensitive measurements for future discoveries.
Area of Science:
- Astrophysics
- Gravitational Wave Astronomy
- Sensor Technology
Background:
- Advanced LIGO's verification of gravitational waves has spurred interest in space-based detection.
- Ground-based detectors face limitations from vibrations and interference, necessitating space missions.
- Space-based detectors aim to capture low-frequency gravitational waves (< 1 Hz).
Purpose of the Study:
- To provide a comprehensive overview of critical technologies for inertial sensors in space gravitational wave detection.
- To discuss future trends and potential applications of these advanced inertial sensors.
Main Methods:
- Development of a core payload-inertial sensor with a drag-free control system.
- Shielding the test mass (TM) from stray force noise.
- Achieving residual acceleration below 10-15 m/s2/Hz1/2 for TMs.
- Integrating innovative designs and numerous subsystems for high-precision motion control.
Main Results:
- The inertial sensor is designed to maintain high-precision test mass motion.
- It provides an ultra-stable inertial reference crucial for laser interferometry.
- The sensor shields against stray force noise, a key challenge in space detection.
Conclusions:
- Critical technologies in inertial sensors are vital for the success of space gravitational wave detection.
- These sensors enable the required precision for detecting faint gravitational wave signals.
- Future trends and applications in sensor technology are discussed for advancing the field.
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