Tilt Error Measurement and Compensation Method for the Holographic Data Storage System Using Disturbance Observer

Author

Kim, Sang-Hoon ; Kim, Jang Hyun ; Lee, YongHee ; Yang, Hyunseok ; Park, Joo-Youn ; Park, Kyoung-Su ; Park, Young-Pil

Author_Institution

Dept. of Mech. Eng., Yonsei Univ., Seoul

Volume

45

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

2248

Lastpage

2251

Abstract

Tilt error can affect a serious effect to holographic data storage system using angle(polytopic) multiplexing. Because the tolerance about tilt error is very tight it is important to measure the tilt error and compensate it. In this paper, tilt error measurement system with additional red laser and reflection geometry is suggested and servo control experiments are conducted. A servo controller to compensate tilt error is designed using disturbance observer. Amount of tilt is decreased smaller than 0.01 degree and signal-to-noise ratio is increased with the tilt servo controller when 0.216 degree of tilt disturbance is applied.

Keywords

compensation; holographic storage; measurement errors; observers; reflection; servomotors; angle(polytopic) multiplexing; compensation method; disturbance observer; holographic data storage; red laser; reflection geometry; servo controller; tilt error measurement; Holographic memories; servosystems;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2016238

Filename

4815995