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주사 레이저 광집게를 위한 압전 구동기 주파수 특성 분석과 주사 경로 추적 및 보상

Analysis of Frequency Response of Piezo Stages and Scanning Path Monitoring/Compensation for Scanning Laser Optical Tweezers

  • 황선욱 (광주과학기술원 기전공학과) ;
  • 이송우 (광주과학기술원 기전공학과) ;
  • 이용구 (광주과학기술원 기전공학과)
  • Hwang, Sun-Uk (Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Lee, Song-Woo (Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Lee, Yong-Gu (Department of Mechatronics, Gwangju Institute of Science and Technology (GIST))
  • 발행 : 2008.04.30

초록

주사 레이저 광집게에서 대물렌즈에 의해 집속된 레이저 초점을 제어하기 위해 사용되는 고속 구동기는 입력 신호의 주파수가 증가함에 따라 출력이 감소한다. 이러한 입출력의 괴리는 CCD 카메라를 통해 관찰이 어려우며 사용자는 희미하게 보이는 레이저 주사 형상을 보고 물체를 조작하여 물체를 포획할 수 없거나 포획하더라도 안정된 제어를 할 수 없다. 본 연구에서는 이러한 문제를 해결하기 위해 사용된 고속 구동기의 주파수 특성을 분석하고, 이를 바탕으로 입력 주파수에 따른 실제 주사 경로를 측정하여 시각화해주는 방법과 입출력 데이터의 차이를 계산하여 입력 데이터를 보상하는 방법을 제안한다.

In scanning laser optical tweezers, high speed scanning stages are used to manipulate a laser beam spot. Due to the inertia of the stage, the output scanning signal decreases with increased frequency of the input signal. This discrepancy in the signals is difficult to observe since most of the energy from the laser beam is blocked out to avoid CCD damage. In this paper, we propose two methods to alleviate these problems. Firstly, frequency responses of piezo stages are measured to analyze the signal drops and the input signal is compensated accordingly. Secondly, an overlay of the scanning path is drawn on the live monitoring screen to enhance the visibility of the scanning path. The result is a drop-compensated scanning with clear path view.

키워드

참고문헌

  1. A. Ashkin, "Forces of a single-beam gradient laser trap on a dielectric sphere in the ray optics regime," Biophysical Journal, vol. 61, no. 2, pp. 569-582, 1992 https://doi.org/10.1016/S0006-3495(92)81860-X
  2. K. C. Neuman and S. M. Block, "Optical trapping," Review of Scientific Instruments, vol. 78, pp. 2787-2809, 2004 https://doi.org/10.1063/1.1785844
  3. G. Sinclair, P. Jordan, J. Courtial, M. Padgett, J. Cooper, and Z. J. Laczik, "Assembly of 3-dimensional structures using programmable holographic optical tweezers," Optics Express, vol. 12, no. 22, pp. 5475-5480, 2004 https://doi.org/10.1364/OPEX.12.005475
  4. R. Agarwal, K. Ladavac, Y. Roichman, G. Yu, C. M. Lieber, and D. G. Grier, "Manipulation and assembly of nanowires with holographic optical traps," Optics Express, vol. 13, no. 22, pp. 8906-8912, 2005 https://doi.org/10.1364/OPEX.13.008906
  5. C. Mio, T. Gong, A. Terray, and D. W. M. Marr, "Design of a scanning laser optical trap for multiparticle manipulation," Review of Scientific Instruments, vol. 71, no. 5, pp. 2196-2200, 2000 https://doi.org/10.1063/1.1150605
  6. R. Nambiar, A. Gajraj, and J. C. Meiners, "All-Optical Constant-Force Laser Tweezers," Biophysical Journal, vol. 87, pp. 1972-1980, 2004 https://doi.org/10.1529/biophysj.103.037697
  7. K. C. Vermeulena, J. van Mameren, G. J. M. Stienen, E. J. G. Peterman, G. J. L. Wuite, and C. F. Schmidt, "Calibrating bead displacements in optical tweezers using acoustooptic deflectors," Review of Scientific Instruments, vol. 77, pp. 013704, 2006 https://doi.org/10.1063/1.2165568
  8. S.-U. Hwang, I.-Y. Park, J.-H. Song, T. W. LeBrun, N. G. Dagalakis, C. Gagnon, A. Balijepalli and Y.-G. Lee, "Three-dimensional scanning optical tweezers," Proceedings of SPIE, vol. 6048, pp. 604803, 2005 https://doi.org/10.1117/12.644463
  9. E. Fallman and O. Axner, "Design for fully steerable dualtrap optical tweezers," Applied Optics, vol. 36, no. 10, pp. 2107-2113, 1997 https://doi.org/10.1364/AO.36.002107
  10. National Instruments, 653X User Manual, 2001
  11. National Instruments, NI-DAQmx Reference Manual, 2007
  12. nPoint, C-300 Series Controller Manual, Version 1.2, 2005
  13. B.-S. Kim, S. Gibson and T. C. Tsao, "Adaptive Control of a Tilt Mirror for Laser Beam Steering," Proceeding of the 2004 American Control Conference, pp. 3417-3421, 2004
  14. R. C. Dorf and R. H. Bishop, Modern Control Systems, 9th Edition, (Prentice Hall Inc., New Jersey, 2000). Chapter 4, Chapter 8-9
  15. M. Hafez, T. C. Sidler, and R. P. Salathe, "Study of the beam path distortion profiles generated by a two-axis tilt single-mirror laser scanner," Optical Engineering, vol. 42, pp. 1048-1057, 2003 https://doi.org/10.1117/1.1557694
  16. S.-W. Lee, T. Lee and Y.-G. Lee, "Stable manipulating of nanowires by line optical tweezers with haptic feedback," Proceedings of SPIE, vol. 6644, pp. 66441X, 2007 https://doi.org/10.1117/12.731737