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Subject: search.filters.subject.Levitation Mass Method

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    Item type:Publication,
    Impact response measurement of contact lenses
    (2013-01-01)
    Watanabe, Kazuhide
    ;
    Miyashita, Naoki
    ;
    Bin, Du Hong
    ;
    Irisa, Kyohei
    ;
    Takita, Akihiro
    Impact response of contact lenses is measured using the Levitation Mass Method (LMM). In the LMM, a small mass collides with contact lenses and the impact force is measured with high accuracy as the inertial force of the moving part. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the moving part. Hysteresis loop and consumed energy as mechanical characteristics of contact lenses are also calculated..
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    Review of the levitation mass method a precision mechanical measurement method
    (2011-05-02)
    Fujii, Yusaku
    ;
    Jin, Tao
    ;
    Mitatha, Somsak
    ;
    Yupapin, Preecha P.
    ;
    Hou, Wenmei
    This paper firstly has a brief review of the present status and future prospects of a method for precision mechanical based on the levitation mass method (LMM). The LMM has been proposed and improved by the author. The force generated by the actuator is measured as the inertial force of the mass levitated with sufficiently small friction using an aerostatic linear bearing and connected to the moving part of the actuator. During the measurement, the Doppler shift frequency of the laser beam reflected by the mass is measured with a high accuracy with the help of an optical interferometer. Subsequently, the velocity, position, acceleration, and inertial force of the mass are calculated using based on this frequency. Simultaneously, the current and voltage supplied to the actuator are measured.