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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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    A method for evaluating dynamical friction in linear ball bearings
    (2010-11-01)
    Fujii, Yusaku
    ;
    Maru, Koichi
    ;
    Jin, Tao
    ;
    Yupapin, Preecha P.
    ;
    Mitatha, Somsak
    A method is proposed for evaluating the dynamical friction of linear bearings, whose motion is not perfectly linear due to some play in its internal mechanism. In this method, the moving part of a linear bearing is made to move freely, and the force acting on the moving part is measured as the inertial force given by the product of its mass and the acceleration of its centre of gravity. To evaluate the acceleration of its centre of gravity, the acceleration of two different points on it is measured using a dual-axis optical interferometer. © 2010 by the authors; licensee MDPI, Basel, Switzerland.
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    Creating worldwide community safety with present technology and privacy protection: The e-JIKEI Network project
    (2010-08-02)
    Kobayashi, Kohjiro
    ;
    Maru, Koichi
    ;
    Ohta, Naoya
    ;
    Yoshiura, Noriaki
    ;
    Ueda, Hiroshi
    In this paper, the e-JIKEI Network project, a project for creating community safety with present day technology, is reviewed. With the e-JIKEI Network, each individual watches around his/her house using cameras as his/her eyes, a computer as his/her brain, and software. For privacy protection, we propose the e-JIKEI with Privacy Protection, in which people who own and manage images (the owner) and people who have the right to view the images (the viewer) are separated by the encryption of the images. In order to evaluate our concept, social experiments have been performed. The present status and future prospects have been discussed in detail.
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    e-JIKEI Network using e-JIKEI Cameras: Community security using considerable number of cheap stand-alone cameras
    (2010-08-01)
    Fujii, Yusaku
    ;
    Maru, Koichi
    ;
    Kobayashi, Kojiro
    ;
    Yoshiura, Noriaki
    ;
    Ohta, Naoya
    The e-JIKEI Network, a concept for realizing a safer and more comfortable community, and the e-JIKEI Camera, a stand-alone camera developed for the e-JIKEI Network, are reviewed. The concept of the e-JIKEI Network is that residents view their surroundings using cheap cameras, which act as their eyes, and home computers, which act as their brains, using the free software provided by us through the Internet. For the complete protection of the privacy of ordinary citizens, we propose a second concept supporting the concept of the e-JIKEI Network; in this concept, those who own and manage images (owners) and those who have the right to view these images (viewers) are separated by means of image encryption. Since 2004, the " Dairi-EYE" series, a free software for a personal computer (PC)-based system, has been distributed through our website. However, the use of PCs is not very user-friendly. Therefore, an all-in-one device called the " e-JIKEI Camera" has been developed. A social experiment of the e-JIKEI Network using e-JIKEI Cameras has been carried out. © 2010 Elsevier Ltd.
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    Material tester with static and dynamic micro forces
    (2009-01-01)
    Fujii, Yusaku
    ;
    Maru, Koichi
    ;
    Shu, Dong Wei
    ;
    Gu, Bin
    ;
    Yamaguchi, Takao
    Material testers with static and dynamic micro forces based on the Levitation Mass Method (LMM) are reviewed. In the LMM, the inertial force of a mass levitated using a pneumatic linear bearing is used as the reference force applied to the objects under test, such as force transducers, materials or structures. The inertial force of the levitated mass is measured using an optical interferometer. The previous achievements and the future prospects on the methods of generating and measuring the static and dynamic micro-Newton level forces based on the LMM are discussed. © 2009 Elsevier B.V. All rights reserved.
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    Design of integrated scanning laser Doppler velocitmeter using arrayed waveguide gratings
    (2009-01-01)
    Maru, Koichi
    ;
    Fujii, Yusaku
    ;
    Obokata, Tomio
    ;
    Ishima, Tsuneaki
    ;
    Yupapin, Preecha
    An integrated scanned differential LDV has been proposed using planar lightwave circuit (PLC) technology. By using the proposed LDV, the measurement position can be scanned in depth direction without any mechanical movement. The PLC technology is utilized in the proposed design for achieving a compact optical circuit. The characteristics of the proposed LDV are simulated with a design model based on grating equations for AWGs. The simulation result reveals that the measurement position can be changed over the range of 46 mm in the depth direction without mechanical movement when the displacement between output sides of two waveguide arrays is 30 mm. © 2009 Elsevier B.V. All rights reserved.