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Author: search.filters.author.Lu, Rong ShengHas files: No

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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.
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    Tilt mechanism for precision control of down-slope component of gravitational force for micro force generation
    (2011-01-01)
    Maru, Koichi
    ;
    Khunnam, Wanchai
    ;
    Hu, Liu Yan
    ;
    Lu, Rong Sheng
    ;
    Yupapin, Preecha
    A simple single-axis tilt mechanism for precision control of the down-slope component of gravitational force is proposed. Precise tilt motion is realized by using a wedge shaped block and a linear actuator driven by a stepping motor. The proposed mechanism can be easily constructed by standardized aluminum frames for the skeletal structure. The measurement result indicates that the tilt angle can be controlled by adjusting the position of the linear actuator and good reproducibility of the tilt angle is achieved by using the proposed tilt mechanism.
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