Optimizing ¹²⁹Xe and ¹³¹Xe relaxation in an NMR gyroscope using buffer gas pressure and wall coating

The accuracy of inertial measurement performed by the nuclear magnetic resonance gyroscope (NMRG) with two isotopes depends on the duration of transverse relaxation. Extending the relaxation of the xenon isotopes at the same time plays a very important role in the accuracy of gyro. The relaxation time of ¹²⁹Xe and ¹³¹Xe can be increased to about 15–20 s by optimizing the buffer gas pressure of N₂ at about 0.57 amg and coating RbH, respectively. According to the results of theoretical analysis and experimentation, the gyro stability reaches 0.6°/h, and the active measurement volume is 3 × 3 × 3 ∼ mm³.