Abstract
The acoustic emission behavior of laser textured disks was studied in both time and frequency domains. The high intensity peaks observed during a starting process are related to specific rotational speeds. Some peaks are associated with slider body resonance excited by a harmonic of the laser bump interaction. A finite element analysis was performed to determine the natural frequencies of sliders. The AE intensity curve can give a correct take-off velocity for a laser textured disk if at least one harmonic component of the bump excitation falls within the filter range at the real take-off velocity. With amplifier settings similar to those for mechanically textured disks, it is not feasible for an AE system to detect contact if the bump spacing is smaller than a critical value.
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