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    Uncertainty analysis of polarization interferometric measurements of hard disk drive recording head-media dynamic spacing
    (2012-12-01)
    Boonsang, Siridech
    ;
    Aroonjarernchay, Wanchai
    In this paper the numerical method based on Monte-Carlo techniques is utilized for the analysis of the flying height measurement uncertainty. In the current flying height tester, the prediction of error is the main concern in order to assure the attainable precision. In previous study, a simplified analytical method is normally used and it may not provide the accurate results of the error prediction especially when the amount of the flying height values becoming as low as sub-5 nm. In this paper, instead of using the analytical method for error analysis, the numerical method based on Monte-Carlo techniques is utilized. Our simulation results show that the measurement uncertainty is mainly from the variation in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the optical constants of DLC layer causes the higher measurement uncertainty. © 2012 IEEE.
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    Uncertainty analysis of polarization interferometric measurements of hard disk drive recording head-media dynamic spacing
    (2012-06-12)
    Boonsang, Siridech
    ;
    Aroonjarernchay, Wanchai
    In this paper the numerical method based on Monte-Carlo techniques is utilized for the analysis of the flying height measurement uncertainty. In the current flying height tester, the prediction of error is the main concern in order to assure the attainable precision. In previous study, a simplified analytical method is normally used and it may not provide the accurate results of the error prediction especially when the amount of the flying height values becoming as low as sub-5 nm. In this paper, instead of using the analytical method for error analysis, the numerical method based on Monte-Carlo techniques is utilized. Our simulation results show that the measurement uncertainty is mainly from the variation in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the optical constants of DLC layer causes the higher measurement uncertainty.
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    Two-dimensional laser Doppler velocimeter using polarized beams and 90° phase shift for discrimination of velocity direction
    (2011-06-01)
    Maru, Koichi
    ;
    Hu, Liu Yan
    ;
    Lu, Rong Sheng
    ;
    Fujii, Yusaku
    ;
    Yupapin, P. P.
    A laser Doppler velocimeter (LDV) for two-dimensional velocity measurement using a simple optical configuration without any optical modulator is proposed. The structure using polarized beams and the 90° phase shift of the reference beam is used to discriminate the direction of velocity. The analytical relation among beat frequencies and velocity components is derived and the characteristics of the proposed LDV are simulated. The simulation results indicate that the direction of velocity can be discriminated by the proposed LDV as well as the magnitudes of the components of the velocity. © 2010 Elsevier GmbH. All rights reserved.