产生纵向塞曼频率分裂的He—Ne激光器输出左、右旋圆偏振光,其光强差和激光频率呈稳定的调谐曲线。装置利用单片机采集幅值信号,采用预测控制理论进行数字调节,输出PWM(PulseWidth Modulation)信号补偿激光管的温度以实现热稳频控制。为实现对热稳频大滞后、非线性这一复杂系统的高质量控制,提出了预测控制方法,该方法克服了传统PID(Proportional IntegralDifferential)调节中存在的调整工作量大,控制后果不能及时反馈的不足,适用于各种热稳频过程。数字仿真和实验验证预测控制是稳定的,对模型误差的适应能力强。对10s采样周期,估算得系统频率稳定度达6.7×10~(-9)。 The He-Ne laser with longitudinal Zeeman frequency splitting outputs left and right circularly polarized light whose light intensity difference and laser frequency exhibit a stable tuning curve. The device uses the single chip to collect the amplitude signal, uses the predictive control theory to carry on the digital adjustment, outputs the PWM (PulseWidth Modulation) signal to compensate the temperature of the laser tube to realize the thermal stability control. In order to realize the high quality control of complex system with large delay and non-linearity, a predictive control method is proposed. This method overcomes the problem of large adjustment workload in traditional PID (Proportional Integral Differential) regulation, and can not provide feedback in time Insufficient for a variety of thermal stabilization process. Digital simulation and experimental verification Predictive control is stable and adaptable to model errors. For the 10s sampling period, the estimated system frequency stability is 6.7 × 10 ~ (-9).