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In this paper, the physical mechanism of the cryogenic superfluid gyroscope based on AC Josephson effect are analyzed , meanwhile, the implementation of the cryogenic superfluid gyroscope was brought up and the advantage of the sensitivity of the gyroscope is proved by theoretical derivation. A method to expand the measurement range based on amplitude locking technology are proposed ,according to the problems of the insufficient range existing in the implementation of the cryogenic superfluid gyroscope based on AC Josephson effect when the information of corresponding angular velocity is extracted. Achievements of the study will be valuable reference to the simulation of cryogenic superfluid gyroscope. Introduction Depending on the physical effects, there are three different types of the cryogenic superfluid gyroscope. The cryogenic superfluid gyroscope based on quantum vortex effect, the cryogenic superfluid gyroscope based on DC Josephson effect and the cryogenic superfluid gyroscope based on AC Josephson effect [1-4]. In the study of the cryogenic superfluid gyroscope based on quantum vortex effect, quantized vortex is considered to be a micro-gyroscope formed by the rotation of the superfluid atoms. Due to the superfluid internal friction is almost negligible, the rotation of the quantized vortex can be considered without any resistance, thus the quantum vortex present the excellent rotational inertia [5]. But, the research of the cryogenic superfluid gyroscope based on quantum vortex effect is still in the stage of theoretical study and experimental verification, the theory has yet to be developed. Although the theory of the cryogenic superfluid gyroscope based on DC Josephson effect is more perfect, but its working temperature must be maintained at about 0.3K [6]. The advantage of the sensitivity of the gyroscope is seriously damaged by the thermal noise when the cryogenic superfluid gyroscope is working in the ultra-low temperature environment. So, how to solve the problem of thermal noise has become a key to implement the cryogenic superfluid gyroscope based on DC Josephson effect. However, the effect of the thermal noise is successfully reduced in the physical mechanism of the AC Josephson effect as the working temperature is increased from 0.3K to 2K[7-8]. Implementation In 2006, professor Packard’s team of U.C. Berkeley discovered the induction relationship between the rotational angular velocity with the AC Josephson effect generated in the couple of weak links in the superfluid loop. This research achievements provide a scientific basis to the implementation of the cryogenic superfluid gyroscope based on AC Josephson effect [9]. The schematic diagram of the superfluid loop based on AC Josephson effect shown in Figure 1. 2nd International Conference on Advances in Mechanical Engineering and Industrial Informatics (AMEII 2016) © 2016. The authors Published by Atlantis Press 1195 Figure .1 The schematic diagram of the superfluid loop based on AC Josephson effect Figure .1 shows the couple of weak links (the nanoscale aperture arrays) are arranged symmetrically in the superfluid loop [10]. In a very short period of time, the temperature and pressure in the superfluid loop will be changed by the heater to creat a potential difference ∆μ 4 ( ) P m s T         (1) For superfluid 4He, where m is the atomic mass of 4He, ρ is the total fluid density, s is an entropy per unit mass, and ∆p and ∆Tare the pressure and temperature differences. Because of the potential difference ∆μ, a phase difference is generated between each of the weak links. In this regime, one can define I I sin ∆φ describing the matter wave function on one side and I I sin ∆φ for the other. Here I is the critical value of the mass current, ∆φ ∆φ 2π∆μt/h is the phase difference, h is the Planck constant. The total mass current can be described 1 2 1 2 sin c I I I I      (2) The matter wave propagate in the superfluid loop and a vibration is generated in the diaphragm

The New Cryogenic Superfluid Gyroscope Based On Matter Wave Interference Effects