Acoustic Emission testing

Disk surface flatness detection

Update time：2008-09-09 18:19　　　 Viewed：次

The experiment analyzes the characteristics of the acoustic emission signal under different magnetic head flying head disk interface and analyzes the various circumstances of frequency characteristic of the acoustic emission signal, using magnetic head cantilever vibration when the acoustic emission signal for comparison, verify the head cantilever vibration produced by acoustic emission signal is closely related to the head disk collision contact, is an important source of the head disk collision acoustic emission signals, can be used as the basis for judging head disk interface contact and collision, it can be used to improve the acoustic emission signal of magnetic head disk interface contact collision detection sensitivity.

Storage density is one of the main performance index of disk. Known by classic formula, a D density satisfy the following relations: a and g in the formula 1 / D ~ (2 + (a + h) ~ (g / 2) ~ 2) ~ (1/2) are respectively determined by the characteristics of magnetic layer and the structure of the magnetic head. Therefore, it is one of the important means to increase disk storage density lower head floating height h. In fact, there are still small bumps on disk surface after strict polishing treatment. They are so tiny that it is difficult to detect it by conventional methods. We can use acoustic emission method.
(Editor：admin)

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