Twin-beam real-time position estimation of micro-objects in 3D
Title | Twin-beam real-time position estimation of micro-objects in 3D |
Publication Type | Journal Article |
Year of Publication | 2016 |
Authors | Gurtner, Martin, and Jiří Zemánek |
Journal | Measurement Science and Technology |
Volume | 27 |
Issue | 12 |
Page | 127003 |
Month | 12 |
Abstract | Various optical methods for measuring positions of micro-objects in 3D have been reported in the literature. Nevertheless, the majority of them are not suitable for real-time operation, which is needed, for example, for feedback position control. In this paper, we present a method for real-time estimation of the position of micro-objects in 3D; the method is based on twin-beam illumination and requires only a very simple hardware setup whose essential part is a standard image sensor without any lens. The performance of the proposed method is tested during a micro-manipulation task in which the estimated position served as feedback for the controller. The experiments show that the estimate is accurate to within ~3 μm in the lateral position and ~7 μm in the axial distance with the refresh rate of 10 Hz. Although the experiments are done using spherical objects, the presented method could be modified to handle non-spherical objects as well. |
DOI | 10.1088/0957-0233/27/12/127003 |