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激光陀螺通常采用高压直流来提供泵浦.放电管的负阻特性会引起稳流回路的不稳定或震荡.为了优化放电环路,研究了放电管的阻抗特性.测量了不同放电电流下的管压降,通过多项式拟合得到了放电管的伏安特性曲线.由于微变阻抗直接决定了环路的稳定性,重点分析了微变阻抗随着电流的变化规律.研究可以为镇流电阻的选择和放电环路的优化设计提供参考,可以降低功耗并提高电路的可靠性.多样本测试表明文中的结论具有普遍适用性.“,”Ring laser gyro is usually pumped by high voltage discharge. Negative impedance characteristic of discharge tube can cause instability or oscillation of the current adjustment circuit. In order to optimize the discharge circuit loop, the impedance characteristic of discharge tube in ring laser gyro was researched. The voltage drop was measured under different discharge current, and voltage-current characteristic was obtained through nonlinear curve fitting. And then differential impedance, which was related to adjustment stability, was analyzed. The research can provide guidance for selection of ballast resistor and reduce the power consumption on premise of reliability.