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http://dx.doi.org/10.3807/HKH.2008.19.2.132

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

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))
Publication Information
Korean Journal of Optics and Photonics / v.19, no.2, 2008 , pp. 132-139 More about this Journal
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.
Keywords
Optical tweezers; Laser scanning; Piezo actuators; Feedback control;
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