Plant gain calibration for an optical storage servo system

Details Plant gain calibration for an optical storage servo system Plant gain calibration for an optical storage servo system

2011-07-05

2011-07-05

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S124100, C369S044340

Reexamination Certificate

active

07974160

ABSTRACT:
A gain calibration method for optical storage servo systems in which, plant gain calibration is used by injecting a reference sine wave r into an optical storage servo system, obtaining an effort signal m at the input of the servo plant and an error signal y at the output of the servo plant, using a DFT (Discrete Fourier Transformation) to translate the time domain signals m and y into frequency responses M and Y, calculating a Y-to-M ratio, and using the magnitude of the Y-to-M ratio as the plant gain K of the servo system. The servo system's sensor gain K1 at the outermost layer of a disk may be calibrated by, e.g., the conventional peak-to-peak measurement. Since K=K1·K2, the servo system's actuator gain K2 at the outermost layer of the disk may be obtained. Because the actuator gain K2 is the same for all layers of a disk, the variation of the sensor gain K1 at an inner layer may follow that of the plant gain K at that layer. Accordingly, the sensor gain K1 may be calibrated for each layer of a multilayer disk, and the calibration is independent from the compensator C.

REFERENCES:
patent: 4195337 (1980-03-01), Bertrand et al.
patent: 5220546 (1993-06-01), Fennema
patent: 7064918 (2006-06-01), Codilian et al.
patent: 7136257 (2006-11-01), Zhang et al.
patent: 7595957 (2009-09-01), Liu et al.

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