A NON-MAGNETIC HEATING SYSTEM FOR THE NUCLEAR MAGNETIC RESONANCE GYROSCOPE

摘要

The nuclear magnetic resonance gyroscope(NMRG) is an apparatus with low size, power consumption, and high performance, which is investigated for replacing GPS in bad environment by DARPA of the USA government. NMRG is one the atomic gyroscopes, which detects the angular rate of the system by utilizing the atomic spin steady processing in the inertial frame. The working temperature of the NMRG is around 100 degrees. To reach this working temperature, a heating system for the bubble containing atomics is needed. A heating slice with special deign can extremely reduce the effect of atomics working performance, however it still exits large magnetic in the bubble. The magnetic changes the processing rate of atomics spin, and then it cuts down the measurement accuracy. Thanks to the low processing rate of Xe atomic spin, which does not response to high frequency magnetic, a high frequency heating system can be utilized to reduce the effect of the residue magnetic. The paper introduces the principle of the NMRG in the first part and then describes the design of the heating system with non-magnetic. To realize the high frequency heating system, a H-bridge high frequency heating signal is designed. The system produces high frequency and has simple electric circuit. The paper also proposes a constant temperature control system, calling PID control system, which utilizes the heat-sensitive sensor collecting the temperature and a program controlling the heating slice. It keeps the NMRG on the very high accuracy temperature.