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建立了以８０９８单片机为控制核心的横向塞曼热稳频系统，由模型预测控制算法计算控制量，通过输出ＰＷＭ波经低通滤波及功率放大后热补偿激光器腔长实现稳频。由于这由ＰＷＭ波实现Ｄ／Ａ变换的精度较低，控制量量化误差将严重地影响控制系统的性能。为此，提出一种通过将ＰＷＭ脉宽作小幅低频调制实现高精度Ｄ／Ａ变换的方法，显著地改善了控制系统的性能，并在此基础上增大了系统的控制裕度，实现了长达１０ｈ的稳频，通过Ｓ曲线估算得频率稳定度为８．７×１０－１０。这种方法简单、实用，可适用于其它智能控制系统。
A transverse Zeeman thermal frequency stabilization system with 8098 single-chip microcomputer as the control center is established. The control quantity is calculated by the model predictive control algorithm. The output frequency of the PWM wave is stabilized by the cavity length of the low-pass filter and power amplifier. Because of the low accuracy of D / A conversion realized by PWM wave, the quantization error of control amount will seriously affect the performance of control system. For this reason, a method of realizing high-precision D / A conversion by making a small low-frequency PWM pulse width modulation is proposed, which remarkably improves the performance of the control system and increases the control margin of the system on the basis of this, Up to 10h frequency stability, estimated by the S-curve frequency stability of 8.7 × 10-10. This method is simple, practical, applicable to other intelligent control system.