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An Optical Heterodyne Technique for Dynamic Eddy-Current Damping Force Evaluation
(2021-01-01)
Youplao, Phichai
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Takita, Akihiro
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Nasbey, Hadi
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Mitatha, Somsak
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Fujii, Yusaku
This work presents and discusses a method for evaluating a dynamic eddy-current damping (ECD) force that is automatically generated in response to eddy currents induced within a conductive plate while moving across a magnetic field in relative motion to a nearby stationary magnet. In the experiment, a Doppler shift frequency signal between the optical interference fringe frequencies was used to calculate the velocity of the moving conductive plate. The other relevant mechanical quantities acting on the plate, such as the displacement, acceleration, and resultant force, were then evaluated by performing numerical calculations of the velocity. Finally, the evaluation of the ECD force could be achieved by performing a calculation to remove the frictional force component from the resultant force. Furthermore, an approximation analysis used to calculate the value of the ECD force was proposed and compared with the measured value as well. From the experimental results, the combined standard uncertainty for evaluating the ECD force was approximately 3.57 mN, corresponding to 3.13% of the maximum eddy-current force of approximately 114.0 mN.
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Impact response measurement of contact lenses
(2013-01-01)
Watanabe, Kazuhide
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Miyashita, Naoki
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Bin, Du Hong
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Irisa, Kyohei
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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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Two-dimensional laser Doppler velocimeter using polarized beams and 90° phase shift for discrimination of velocity direction
(2011-06-01)
Maru, Koichi
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Hu, Liu Yan
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Lu, Rong Sheng
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Fujii, Yusaku
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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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BOB loss-preventing for modern trade retail product safety
(2011-05-02)
Dulyakorn, Nitikorn
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Pavaganun, Chavana
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Mangalabruks, Benja
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Fujii, Yusaku
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Yupapin, Preechap P.
For Bottom Of Basket (BOB) Loss-preventing for Modern Trade Retails camera indicates the items of shoplifting front end theft accounts of total in-store shrink. BOB shrink is particularly hard on a store's margins since a single BOB item can often run for example, a 12-pack of paper towels, a large pack of diapers or a large box of laundry detergent. Just a single loss per lane per day can drive many profit loss for a large grocery chain. Numerous attempts have been made over the years to combat this problem, the camera and detect sensor linkage at cashier land can integrate with the POS and can recognize what the BOB items is and link it to the item's UPC. That means they can ring up items before lost and can deter collusion, and can stop cashiers from ignoring that an item is on the bottom of the cart. Lastly, this research vision outlook on next future work activity that will use GUI and orientation product-safety protection sensor to synchronization the 3D visualization with mobile explorer as a real time product protection on Modern Trade retails location.
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Review of the levitation mass method a precision mechanical measurement method
(2011-05-02)
Fujii, Yusaku
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Jin, Tao
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Mitatha, Somsak
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Yupapin, Preecha P.
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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.
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Marathon monitoring and safety using ad hoc networks
(2011-05-02)
Sirichai, Apatcha
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Pradisathaporn, Suriya
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Kaviya, Somkuan
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Wiriyaromp, Warrachai
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Fujii, Yusaku
This paper proposes the use of modern communication technology that sports can be different, especially, in competition, which they are difficult to track (recording) because the rules of the competition and distance cause the effects of time recording errors in terms of accuracy and impartiality. The integrated vehicular ad hoc network (VANET) is recommended to accommodate such problems. The system is integrated by a 3G or 4G cellular wireless network. By using the general packet radio service (GPRS) to monitor closely to the athletes though the route and duration of competition, where the sports safety and clarity can also be monitored and realized.
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Thai puppet performance with projector and light in theatre
(2011-05-02)
Ratanatada, Faprathan
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Sirichai, Poonsak
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Kaviya, Somkuan
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Mangalabruks, Benja
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Pavaganun, Chavana
The presented herein to guide the more ambitious beginner to understand the principles involved. The concept of cultural revitalization is an effort to solve problems of the development, creation and application arts and culture identity. The Hoon Lakorn Lek (Thai Puppet Show) performance is likely to serve as a solution to the conservation, development and dissemination of Thailand's cultural heritage with exquisite beauty and superior value. The Art and Science of Moving Light in Theatre, Live Performance, Broadcast, and Entertainment cover the history, the science, and the art of automated lighting.
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An intelligent and multipurpose digital ticket using ad hoc network
(2011-05-02)
Pradisathaporn, Suriya
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Kaviya, Somkuan
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Fujii, Yusaku
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Yupapin, Preecha P.
We propose the use of an intelligent ticket that can be applied incorporating with the ordinary ticket, where in this case more digital information with for security application is included, especially, the personal data that can be available for security control. The use of the corporative functions such as GPS (Global Positioning System) data, seat positions and personal and identification data can be provide, in which the crime prevention in the sports, especially, in the stadium can be operated and realized.
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Surveillance behavior of juvenile by using RFID and CCTV monitoring
(2011-05-02)
Sirichai, Apatcha
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Chinnasri, Oranutda
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Wiriyaromp, Warrachai
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Fujii, Yusaku
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Yupapin, Preecha P.
This report presents the use of modern communications technology to track the behavior of the Juvenile, which are difficult to track (record) because the number and distance. Network of RFID and GPS is recommended to cover such problems. The system will consolidate and submit to the control center using GPS to check very closely with the Juvenile that route and duration of a safe place will help prevention and suppression of the offender's Juvenile is also possible to detect and recognize.
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Community monitoring and security using an intelligent camera in EAT smart grids
(2011-05-02)
Thananunsophon, Ketsupich
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Mangalabruks, Benja
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Fujii, Yusaku
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Yupapin, Preecha P.
The paper purposes the use of new energy management method for monitoring sub-electrical power station security, service and maintenance. A system consists of a close circuit television (CCTV) for surveillance system, in which the electrical system prevention and monitoring can also be operated by using the thermal viewer (sensor). The consumers confident for the electricity quality will be increased by EAT smart Grid. This equipment can be installed in the system of substation in order to create stability for Thailand electricity system throughout the Smart Grids.

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