Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Analysis of Frequency Response of Piezo Stages and Scanning Path Monitoring/Compensation for Scanning Laser Optical Tweezers

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

  • 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))
  • 황선욱 (광주과학기술원 기전공학과) ;
  • 이송우 (광주과학기술원 기전공학과) ;
  • 이용구 (광주과학기술원 기전공학과)
  • Published : 2008.04.30
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Abstract

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.

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.

Keywords

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