Analysis on thermal noise in superfluid quantum interference gyroscope

作者：Zheng Rui; Zhao Wei^*; Liu Jian Ye; Xie Zheng

来源：Journal of Chinese Inertial Technology, 2012, 20(6): 739-743.

• Josephson oscillations
• Phase difference
• Quantum interference
• Quantum interferometer
• Standard deviation
• Steady state
• Weak links

Thermal noise is closely related with steady state and resolution of superfluid gyroscope. In this paper, the thermal noise model of superfluid gyroscope was established by using the standard deviation of superfluid';s phase difference across the weak link. Based on this model, the impacts of thermal noise on Josephson oscillation effect and gyroscope';s resolution were analysed, and the ways to suppress the thermal noise were studied. Simulation results show that, by increasing the number of aperture to thousands and setting the temperature and aperture';s diameter to 2.169 K and 70 nm respectively, the thermal noise can be suppressed to the order of 10-9rad/(s&middotHz1/2), then the gyroscope has the ability to detect very small angular velocity.

• 出版日期2012
• 单位南京航空航天大学