This thesis concerns a study of the application, and performance optimization, of standard lead-lag compensation techniques to improve the closed loop performance of a focus servo system for an optical data storage device. Only with proper application of these compensation techniques will it be possible to meet the sub-micrometer focus error tolerances while maintaining the stability of the closed loop system. The performance indices used in this optimization study are the Integral of the Squared Error (ISE), the Integral of the Absolute Error (IAE), and the Integral of the Time multiplied by the Absolute Error (ITAE) as defined below, with the error function e(t) being the focus error of the closed loop servo system in response to a step input. ISE= ∫OT e²(t) dt IAE= ∫OT
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机译：本发明涉及对用于改善光学数据存储设备的聚焦伺服系统的闭环性能的标准超前-滞后补偿技术的应用和性能优化的研究。只有正确应用这些补偿技术，才能在保持闭环系统稳定性的同时满足亚微米的聚焦误差容差。此优化研究中使用的性能指标是平方误差（ISE），绝对误差（IAE）的积分，以及时间的绝对值乘以绝对误差（ITAE），如下所示，该误差为函数e（t）是响应于阶跃输入的闭环伺服系统的聚焦误差。 ISE =∫OTe²（t）dt IAE =∫OT
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