The Research Of Range Extension Of Superfluid Interference Gyroscope System Based On Pressure And Thermal Phase Shift

The superfluid gyroscope is a new kind of gyroscope based on Cryogenics. The superfluid interference gyro has a huge advantage because of basing on matter wave interferometry therefore becomes the main development direction of the superfluid gyroscope. Although under long term research domestic and foreign scholars have made some achievements, there are some key problems to be solved. In this thesis, the driving mechanism, super-fluid heat transfer in range extension system and new scheme of phase locking are studied.The properties of superfluid helium and operating principle of the superfluid interference gyro is studied first. Based on the gyro in Packard’s group, the operating principle of each module is studied in detail. And the mathematical model is set up to be the theoretical basis. The key problems possibly exist are also raised.Through the research of the driving mode of superfluid gyroscope, the model of driving mode, flow equation and the diaphragm amplitude are set up to be the general model of the driving mode. As a result of the analysis of the driving mode, both modes can produce a constant chemical potential difference and the gyro can work on a certain frequency. But pressure drive can only work for a shot time because of the limited displacement of diaphragm. While the thermal drive can work stably all through. The research of the driving mode of superfluid gyroscope is the base of range extension.Range extension system is an important part of the superfluid interference gyro. In Range extension system, the thermal phase shift is injected by heating the thermal resistance, so the range extension is closely linked to the super-fluid heat transfer. After combing both research, the conclusion is that the injection of the thermal phase shift is not real-time and the delay will greatly influence the performance of the superfluid gyroscope. So deep research into the superfluid helium heat transfer and the exploration of the new solutions to solve time delay problem is important.In order to solve the delay of the thermal phase shift injection, the range extension scheme of the cooperation of pressure and thermal phase shift is put forward in this thesis. The scheme both solved the defect of the injection of pressure and thermal phase shift and improved the gyro performance. In the end, optimized scheme is raised to improve the property, and effectiveness is proved through simulation.