Nuclear magnetic resonance gyroscopes(NMRG) have received widespread attention to the fields of national defense and civil applications due to their potential for miniaturization and low cost. The relaxation time is an important parameter to measure the performance of the alkali vapor cell of the NMR gyroscope, the most commonly used industry standard measurement method of longitudinal relaxation time(T1) is the measurement method using π pulse plus 1/2π pulse, so the measurement accuracy of the T1 is affected by the accuracy of the pulse duration. Usually the maximum value of the signal amplitude correspond to the time of 1 /2πpulse duration, but it cannot eliminate the influence of the random error of the system, the use of multiple cycles to automatically fit the pulse duration improves the accuracy of the pulse duration, saves a lot of measurement time, eliminates human error, and ultimately improves the T1 measurement accuracy.
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