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ＣＤ机中，为跟踪盘片，其伺服系统必须能检测到盘片的微小的位移。在本论文中，将ＣＤ头的工作原理应用到物体表面粗糙度的测量当中，可使测量系统小型化，使用更方便
CD player, in order to track the disc, the servo system must be able to detect small disc displacement. In this thesis, applying the working principle of CD head to the measurement of the surface roughness of objects can make the measurement system smaller and more convenient to use