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One Idea on a Three Dimensional Measuring System Using Light Intensity Modulation

Fujimoto Ikumatsu    (School of Mechanical and Control Engineering, Sun Moon University   ); Cho In-Ho    (Sun Moon University   ); Pak Jeong-Hyeon    (School of Mechanical and Control Engineering, Sun Moon University   ); Pyoun Young-Sik    (School of Mechanical and Control Engineering, Sun Moon University  );
  • 초록

    A new optical digitizing system for determining the position of a cursor in three dimensions(3D) and an experimental device for its measurement are presented. A semi-passive system using light intensity modulation, a technology that is well known in radar ranging, is employed in order to overcome precision limitations imposed by background light. This system consists of a charge-coupled device camera placed before a rotating mirror and a light-emitting diode whose intensity is modulated. Using a Fresnel pattern for light modulation, it is verified that a substantial improvement of the signal to noise ratio is realized for the background noise and that a resolution of less than a single pixel can be achieved. This opens the doorway to the realization of high precision 3D digitized measurement. We further propose that a 3D position measurement with a monocular optical system can be realized by a numerical experiment if a linear-period modulated waveform is adopted as the light-modulating one.


  • 주제어

    3D position measurement .   rotating scanning mechanism .   Fresnel diffraction pattern .   light intensity modulation .   linear-period modulation.  

  • 참고문헌 (12)

    1. I. Fujimoto and S. Ando, '3D semi-passive digitizer using pulse-compression,' Proc. of National Conference of Institute of Electrical Engineers of Japan, March 26-28, vol. 3, pp. 49- 50, 1996 
    2. I. Fujimoto, M. Mituhashi, and S. Ando, '3D semi-passive digitizing system using pulsecompression,' Technical Digest of 14Th Sensor Symposium in Japan, pp. 285-288, 1996 
    3. I. Fujimoto and S. Ando, 'A monocular 3Ddisplacement measurement of a light-spot cursor using a linear-period modulated signal,' Institute of Electronics, Information and Communication Engineers, C-1, vol. j81, no. 9, pp. 544-552, 1998 
    4. J. R. Klauder, A. C. Price, S. Darlington, and W. J. Albersheim, 'The theory and design of chirp radar,' Bell System Technical Journal, vol. 39, no. 4, pp. 745-808, 1960 
    5. I. Fujimoto and M. Abe, 'Application of two dimensional laser digitizer to surveying,' Institute of System, Control and Information Engineers, vol. 7, no. 9, pp. 391-393, 1994 
    6. M. Mituhashi, H. Mochiduki, Y. Tamura, and H. Yamasaki, ''Velocity vector estimation of moving objects using sensor-array and linearperiod- modulated signal,' Society of Instrument and Control Engineers, vol. 23, no. 7, pp. 665-670, 1987 
    7. I. Fujimoto, T. Hirose, M. Abe, N. Saito, and D. Takahashi, 'Two dimensional large scale laser digitizer system with a cordless cursor,' Institute of System, Control and Information Engineers, vol. 6, no. 11, pp. 479-487, 1993 
    8. M. I. Skolnik, Introduction to Radar Systems, McGraw-Hill Book Co., New York, 1980 
    9. R. A. Altes and D. P. Skinner, ''Sonar-velocity resolution with a linear period modulated pulses,' Journal of Acoustic Society of America, vol. 61, pp. 1019-1030, 1977 
    10. H. Sakurai, T. Takada, and T. Sakata, 'Development of a new planar metrology system using laser,' Metrology, pp. 35-42, 1992 
    11. N. Kondo, Y. Ohashi, and A. Jitsumori, 'Signal processing in measurement sensors,' Shoko-do, 1987 
    12. I. Fujimoto, 'One idea on the reduction of systematic errors with interferometer,' Proc. of National Conference of Japan Society for Precision Engineering, pp. 89, 2000 

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